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Florio KL, Williams EM, White D, Daming T, Hostetter S, Schrufer-Poland T, Gray R, Schmidt L, Grodzinsky A, Lee J, Rader V, Swearingen K, Nelson L, Patel N, Magalski A, Gosch K, Jones P, Fu Z, Spertus JA. Validation of a noninvasive cardiac output monitor in maternal cardiac disease: comparison of NICOM and transthoracic echocardiogram. Am J Obstet Gynecol MFM 2024; 6:101312. [PMID: 38342307 DOI: 10.1016/j.ajogmf.2024.101312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/01/2024] [Accepted: 02/05/2024] [Indexed: 02/13/2024]
Abstract
BACKGROUND The physiological changes to the cardiovascular system during pregnancy are considerable and are more pronounced in those with cardiac disease. In the general population, noninvasive hemodynamic monitoring is a valid alternative to pulmonary artery catheterization, which poses risk in the pregnant population. There is limited data on noninvasive cardiac output monitoring in pregnancy as an alternative to pulmonary artery catheterization. OBJECTIVE We sought to compare transthoracic echocardiography with a noninvasive cardiac output monitor (NICOM, Cheetah Medical) in pregnant patients with and without cardiac disease. STUDY DESIGN This was a prospective, open-label validation study that compared 2-dimensional transthoracic echocardiography with NICOM estimations of cardiac output in each trimester of pregnancy and the postpartum period. Participants with and without cardiac disease with a singleton gestation were included. NICOM estimations of cardiac output were derived from thoracic bioreactance and compared with 2-dimensional transthoracic echocardiography for both precision and accuracy. A mean percentage difference of ±30% between the 2 devices was considered acceptable agreement between the 2 measurement techniques. RESULTS A total of 58 subjects were enrolled; 36 did not have cardiac disease and 22 had cardiac disease. Heart rate measurements between the 2 devices were strongly correlated in both groups, whereas stroke volume and cardiac output measurements showed weak correlation. When comparing the techniques, the NICOM device overestimated cardiac output in the control group in all trimesters and the postpartum period (mean percentage differences were 50.3%, 52.7%, 48.1%, and 51.0% in the first, second, and third trimesters and the postpartum period, respectively). In the group with cardiac disease, the mean percentage differences were 31.9%, 29.7%, 19.6%, and 35.2% for the respective timepoints. CONCLUSION The NICOM device consistently overestimated cardiac output when compared with 2-dimensional transthoracic echocardiography at all timepoints in the control group and in the first trimester and postpartum period for the cardiovascular disease group. The physiological changes of pregnancy, specifically the mean chest circumference and total body water, may alter the accuracy of the cardiac output measurement by the NICOM device as they are currently estimated. Although NICOM has been validated for use in the critical care setting, there is insufficient data to support its use in pregnancy.
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Affiliation(s)
- Karen L Florio
- Department of Obstetrics and Gynecology, University of Missouri, Columbia MO (Dr Florio); Department of Obstetrics and Gynecology, University of Missouri-Kansas City, Kansas City, MO (Drs Florio, Williams, Daming, Hostetter, Schrufer-Poland, and Patel); Division of Women's and Children's, Saint Luke's Hospital of Kansas City, Kansas City, MO (Dr Florio, Ms White, Ms Gray, Ms Swearingen, and Ms Nelson).
| | - Emily M Williams
- Department of Obstetrics and Gynecology, University of Missouri-Kansas City, Kansas City, MO (Drs Florio, Williams, Daming, Hostetter, Schrufer-Poland, and Patel)
| | - Darcy White
- Division of Women's and Children's, Saint Luke's Hospital of Kansas City, Kansas City, MO (Dr Florio, Ms White, Ms Gray, Ms Swearingen, and Ms Nelson)
| | - Tara Daming
- Department of Obstetrics and Gynecology, University of Missouri-Kansas City, Kansas City, MO (Drs Florio, Williams, Daming, Hostetter, Schrufer-Poland, and Patel); Department of Maternal-Fetal Medicine, Mercy Hospital of Saint Louis, Saint Louis, MO (Dr Daming)
| | - Sarah Hostetter
- Department of Obstetrics and Gynecology, University of Missouri-Kansas City, Kansas City, MO (Drs Florio, Williams, Daming, Hostetter, Schrufer-Poland, and Patel); Department of Maternal Fetal Medicine, Mercy Hospital of Springfield, Springfield, MO (Dr Hostetter)
| | - Tabitha Schrufer-Poland
- Department of Obstetrics and Gynecology, University of Missouri-Kansas City, Kansas City, MO (Drs Florio, Williams, Daming, Hostetter, Schrufer-Poland, and Patel); AdventHealth High Risk Pregnancy Consultants, Orlando, FL (Dr Schrufer-Poland)
| | - Rebecca Gray
- Division of Women's and Children's, Saint Luke's Hospital of Kansas City, Kansas City, MO (Dr Florio, Ms White, Ms Gray, Ms Swearingen, and Ms Nelson)
| | - Laura Schmidt
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus); Department of Cardiology, University of Missouri-Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, Magalski, and Spertus)
| | - Anna Grodzinsky
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus); Department of Cardiology, University of Missouri-Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, Magalski, and Spertus)
| | - John Lee
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus); Department of Cardiology, University of Missouri-Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, Magalski, and Spertus)
| | - Valerie Rader
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus); Department of Cardiology, University of Missouri-Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, Magalski, and Spertus)
| | - Kathleen Swearingen
- Division of Women's and Children's, Saint Luke's Hospital of Kansas City, Kansas City, MO (Dr Florio, Ms White, Ms Gray, Ms Swearingen, and Ms Nelson)
| | - Lynne Nelson
- Division of Women's and Children's, Saint Luke's Hospital of Kansas City, Kansas City, MO (Dr Florio, Ms White, Ms Gray, Ms Swearingen, and Ms Nelson)
| | - Neil Patel
- Department of Obstetrics and Gynecology, University of Missouri-Kansas City, Kansas City, MO (Drs Florio, Williams, Daming, Hostetter, Schrufer-Poland, and Patel); Department of Obstetrics and Gynecology, University of Kentucky, Lexington KY (Dr Patel)
| | - Anthony Magalski
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus); Department of Cardiology, University of Missouri-Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, Magalski, and Spertus)
| | - Kensey Gosch
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus)
| | - Philip Jones
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus)
| | - Zhuxuan Fu
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus)
| | - John A Spertus
- Mid-America Heart Institute, Saint Luke's Hospital of Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, and Magalski, Ms Gosch, Mr Jones, and Drs Fu and Spertus); Department of Cardiology, University of Missouri-Kansas City, Kansas City, MO (Drs Schmidt, Grodzinsky, Lee, Rader, Magalski, and Spertus)
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Chung CR, Ko RE, Jang GY, Lee K, Suh GY, Kim Y, Woo EJ. Comparison of noninvasive cardiac output and stroke volume measurements using electrical impedance tomography with invasive methods in a swine model. Sci Rep 2024; 14:2962. [PMID: 38316842 PMCID: PMC10844629 DOI: 10.1038/s41598-024-53488-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 02/01/2024] [Indexed: 02/07/2024] Open
Abstract
Pulmonary artery catheterization (PAC) has been used as a clinical standard for cardiac output (CO) measurements on humans. On animals, however, an ultrasonic flow sensor (UFS) placed around the ascending aorta or pulmonary artery can measure CO and stroke volume (SV) more accurately. The objective of this paper is to compare CO and SV measurements using a noninvasive electrical impedance tomography (EIT) device and three invasive devices using UFS, PAC-CCO (continuous CO) and arterial pressure-based CO (APCO). Thirty-two pigs were anesthetized and mechanically ventilated. A UFS was placed around the pulmonary artery through thoracotomy in 11 of them, while the EIT, PAC-CCO and APCO devices were used on all of them. Afterload and contractility were changed pharmacologically, while preload was changed through bleeding and injection of fluid or blood. Twenty-three pigs completed the experiment. Among 23, the UFS was used on 7 pigs around the pulmonary artery. The percentage error (PE) between COUFS and COEIT was 26.1%, and the 10-min concordance was 92.5%. Between SVUFS and SVEIT, the PE was 24.8%, and the 10-min concordance was 94.2%. On analyzing the data from all 23 pigs, the PE between time-delay-adjusted COPAC-CCO and COEIT was 34.6%, and the 10-min concordance was 81.1%. Our results suggest that the performance of the EIT device in measuring dynamic changes of CO and SV on mechanically-ventilated pigs under different cardiac preload, afterload and contractility conditions is at least comparable to that of the PAC-CCO device. Clinical studies are needed to evaluate the utility of the EIT device as a noninvasive hemodynamic monitoring tool.
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Affiliation(s)
- Chi Ryang Chung
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Ryoung Eun Ko
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Geuk Young Jang
- Department of Biomedical Engineering, College of Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Korea
| | - Kyounghun Lee
- Department of Biomedical Engineering, College of Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Korea
| | - Gee Young Suh
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Yongmin Kim
- Department of Convergence IT Engineering, POSTECH, Pohang, Korea
| | - Eung Je Woo
- Department of Biomedical Engineering, College of Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Korea.
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Kandil S, Sedra A. Hemodynamic monitoring in liver transplantation 'the hemodynamic system'. Curr Opin Organ Transplant 2024; 29:72-81. [PMID: 38032246 DOI: 10.1097/mot.0000000000001125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
PURPOSE OF REVIEW The purpose of this article is to provide a comprehensive review of hemodynamic monitoring in liver transplantation. RECENT FINDINGS Radial arterial blood pressure monitoring underestimates the aortic root arterial blood pressure and causes excessive vasopressor and worse outcomes. Brachial and femoral artery monitoring is well tolerated and should be considered in critically ill patients expected to be on high dose pressors. The pulmonary artery catheter is the gold standard of hemodynamic monitoring and is still widely used in liver transplantation; however, it is a highly invasive monitor with potential for serious complications and most of its data can be obtained by other less invasive monitors. Rescue transesophageal echocardiography relies on few simple views and should be available as a standby to manage sudden hemodynamic instability. Risk of esophageal bleeding from transesophageal echocardiography in liver transplantation is the same as in other patient populations. The arterial pulse waveform analysis based cardiac output devices are minimally invasive and have the advantage of real-time beat to beat monitoring of cardiac output. No hemodynamic monitor can improve clinical outcomes unless integrated into a goal-directed hemodynamic therapy. The hemodynamic monitoring technique should be tailored to the patient's medical status, surgical technique, and the anesthesiologist's level of expertise. SUMMARY The current article provides a review of the current hemodynamic monitoring systems and their integration in goal-directed hemodynamic therapy.
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Affiliation(s)
- Sherif Kandil
- Department of Anesthesiology, Keck Medical School of USC, Los Angeles, California, USA
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Svensøy JN, Alonso E, Elola A, Bjørnerheim R, Ræder J, Aramendi E, Wik L. Cardiac output estimation using ballistocardiography: a feasibility study in healthy subjects. Sci Rep 2024; 14:1671. [PMID: 38238507 PMCID: PMC10796317 DOI: 10.1038/s41598-024-52300-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 01/16/2024] [Indexed: 01/22/2024] Open
Abstract
There is no reliable automated non-invasive solution for monitoring circulation and guiding treatment in prehospital emergency medicine. Cardiac output (CO) monitoring might provide a solution, but CO monitors are not feasible/practical in the prehospital setting. Non-invasive ballistocardiography (BCG) measures heart contractility and tracks CO changes. This study analyzed the feasibility of estimating CO using morphological features extracted from BCG signals. In 20 healthy subjects ECG, carotid/abdominal BCG, and invasive arterial blood pressure based CO were recorded. BCG signals were adaptively processed to isolate the circulatory component from carotid (CCc) and abdominal (CCa) BCG. Then, 66 features were computed on a beat-to-beat basis to characterize amplitude/duration/area/length of the fluctuation in CCc and CCa. Subjects' data were split into development set (75%) to select the best feature subset with which to build a machine learning model to estimate CO and validation set (25%) to evaluate model's performance. The model showed a mean absolute error, percentage error and 95% limits of agreement of 0.83 L/min, 30.2% and - 2.18-1.89 L/min respectively in the validation set. BCG showed potential to reliably estimate/track CO. This method is a promising first step towards an automated, non-invasive and reliable CO estimator that may be tested in prehospital emergencies.
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Affiliation(s)
- Johannes Nordsteien Svensøy
- Norwegian National Advisory Unit on Prehospital Emergency Medicine (NAKOS), Division of Prehospital Services, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Erik Alonso
- Department of Applied Mathematics, University of the Basque Country (UPV/EHU), Bilbao, Spain.
| | - Andoni Elola
- Department of Electronic Technology, University of the Basque Country (UPV/EHU), Eibar, Spain
| | - Reidar Bjørnerheim
- Division of Internal Medicine, Department of Cardiology, Ullevål Hospital, Oslo, Norway
| | - Johan Ræder
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
- Division of Emergency Medicine, Department of Anestesiology, Ullevål Hospital, Oslo, Norway
| | - Elisabete Aramendi
- Department of Communications Engineering, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Lars Wik
- Norwegian National Advisory Unit on Prehospital Emergency Medicine (NAKOS), Division of Prehospital Services, Oslo University Hospital, Oslo, Norway
- Division of Prehospital Services, Department of Air Ambulance, Ullevål Hospital, Oslo, Norway
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5
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Yang Y, Qian QY, Yang XY, Li DS, Chen DS, Shen M. Measurement of non-invasive cardiac output during cycling exercise in ischemic stroke inpatients: A pilot study. Technol Health Care 2024; 32:215-228. [PMID: 37302050 DOI: 10.3233/thc-220823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
BACKGROUND Cardiac dysfunction accompanies acute ischemic stroke and affects the effective implementation of early rehabilitation interventions. There is a lack of reference hemodynamic data on cardiac function in the subacute phase of ischemic stroke. OBJECTIVE In this study, we aimed to identify appropriate cardiac parameters for exercise training utilizing a pilot study. METHODS We used a transthoracic electrical bioimpedance non-invasive cardiac output measurement (NICOM) device to monitor cardiac function in real time for two groups [i.e., subacute ischemic stroke inpatients group (n= 10) and healthy control group (n= 11)] using a cycling exercise experiment. The parameters of both groups were compared to highlight the cardiac dysfunction in the subacute phase in patients with ischemic stroke. RESULTS We considered stroke volume index (SVI) and systemic vascular resistance index (SVRi) as the primary outcomes, and there was significant intragroup difference (stroke group: P< 0.001; control group: P< 0.001, using one-way ANOVA) and significant intergroup difference at each individual time segment (P< 0.01, using independent t-test). Among the secondary outcomes, i.e., cardiac index (CI), ejection fraction (EF), end-diastolic volume (EDV), and cardiac contraction index (CTI), we found significant intergroup differences in CI, EF, and CTI scores (P< 0.01, using independent t-test). Significant interaction with respect to time and group were seen only in the SVRi and CI scores (P< 0.01, using two-way ANOVA). There was no significant inter- or intra-group differences in EDV scores. CONCLUSION SVRI, SVI, and CI values highlight cardiac dysfunction in stroke patients the most. At the same time, these parameters suggest that cardiac dysfunction in stroke patients may be closely related to the increased peripheral vascular resistance caused by infarction and the limitation of myocardial systolic function.
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Affiliation(s)
- Ying Yang
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
| | - Qiu-Yang Qian
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
| | - Xiao-Yan Yang
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
| | - De-Sheng Li
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
| | - De-Sheng Chen
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
| | - Mei Shen
- Department of Rehabilitation Medicine, People's Hospital of Longhua, Shenzhen, Guangdong, China
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Ochiai R, Terada T, Sakamoto N. Comparative evaluation of stroke volume variation measured by pulse wave transit time and arterial pressure wave. Technol Health Care 2024; 32:651-662. [PMID: 37483029 PMCID: PMC10977375 DOI: 10.3233/thc-220849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Accepted: 05/15/2023] [Indexed: 07/25/2023]
Abstract
BACKGROUND Several monitors have been developed that measure stroke volume (SV) in a beat-to-beat manner. Accordingly, Stroke volume variation (SVV) induced by positive pressure ventilation is widely used to predict fluid responsiveness. OBJECTIVE The purpose of this study was to compare the ability of two different methods to predict fluid responsiveness using SVV, stroke volume variation by esCCO (esSVV) and stroke volume variation by FloTrac/VigileoTM (flSVV). METHODS esSVV, flSVV, and stroke volume index (SVI) by both monitoring devices of 37 adult patients who underwent laparotomy surgery, were measured. Receiver operating characteristic (ROC) analysis was performed. RESULTS The area under the ROC curve (AUC) of esSVV was significantly higher than that of flSVV (p= 0.030). esSVV and flSVV showed cutoff values of 6.1% and 10% respectively, to predict an increase of more than 10% in SVI after fluid challenge. The Youden index for esSVV was higher than flSVV, even with a cutoff value between 6% and 8%. CONCLUSION Since esSVV and flSVV showed significant differences in AUC and cutoff values, the two systems were not comparable in predicting fluid responsiveness. Furthermore, it seems that SVV needs to be personalized to accurately predict fluid responsiveness for each patient.
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Affiliation(s)
| | - Takashi Terada
- Department of Anesthesiology, Japan Community Health Care Organization Mishima General Hospital, Fujikubo, Mishima, Japan
| | - Noriaki Sakamoto
- Department of Anesthesiology, Toho University Omori Medical Centre, Oota, Japan
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Jeleff A, Suh N, Schranc Á, Diaper J, Bendjelid K, Schiffer E. New Noninvasive Method for the Assessment of Central Venous Oxygen Saturations in Critically Ill Patients. J Cardiothorac Vasc Anesth 2024; 38:170-174. [PMID: 37827917 DOI: 10.1053/j.jvca.2023.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 09/05/2023] [Accepted: 09/15/2023] [Indexed: 10/14/2023]
Abstract
OBJECTIVES To compare noninvasive external jugular vein oxygen saturations (SjvO2) and central venous oxygen saturation (ScvO2) from a blood sample in patients admitted to the intensive care unit. DESIGN A prospective, comparative, monocentric clinical trial design was used. SETTING The study was performed in the Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva (Switzerland). PARTICIPANTS A total of 79 patients were enrolled; patients with confirmed COVID-19 infection requiring invasive mechanical ventilation (patients with COVID-19, n = 36) and patients after liver transplantation (posttransplant patients, n = 43). INTERVENTIONS Simultaneous measurement of SjvO2 by near-infrared spectroscopy and ScvO2 from central venous blood samples using a blood gas analyzer in stable hemodynamic conditions. MEASUREMENTS AND MAIN RESULTS A strong linear correlation was evidenced in both the COVID-19 and posttransplant patient groups between the 2 modalities. The Bland-Altman analysis showed low bias in accordance with low percentage error in both groups (0.57% and 8.09% for patients with COVID-19; 0.00% and 13.72% for posttransplant patients). CONCLUSIONS Central venous oxygen saturation can be estimated reasonably by the continuous noninvasive measurement of SjvO2 using near-infrared spectroscopy.
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Affiliation(s)
- Alexandre Jeleff
- Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Noémie Suh
- Division of Intensive Care, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Álmos Schranc
- Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University of Geneva, Geneva, Switzerland.
| | - John Diaper
- Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland; Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University of Geneva, Geneva, Switzerland
| | - Karim Bendjelid
- Division of Intensive Care, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Eduardo Schiffer
- Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
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Iftikhar IH, BaHammam A, Jahrami H, Ioachimescu O. Accuracy of residual respiratory event detection by CPAPs: a meta-analysis. Sleep Breath 2023; 27:1759-1768. [PMID: 36715836 DOI: 10.1007/s11325-023-02780-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/10/2023] [Accepted: 01/16/2023] [Indexed: 01/31/2023]
Abstract
PURPOSE Most continuous positive airway pressure (CPAP) machines have built-in manufacturer-specific proprietary algorithms for automatic respiratory event detection (AED) based on very specific respiratory events scoring criteria. With regards to the accuracy of these data from CPAP machines, evidence from the literature seems conflicting, which formed the basis for this meta-analysis. METHODS A meta-analysis was performed on studies that reported Bland-Altman analysis data on agreement (mean bias and limits of agreement [LoA]) of CPAP-determined apnea-hypopnea index (AHI) at therapeutic pressures (AHIFLOW) with that determined from simultaneously conducted polysomnograms (AHIPSG). RESULTS In six studies, ResMed CPAPs were used, and in another six studies, Respironics CPAPs were used, while only one study used Fisher & Paykel (F&P) CPAPs. The pooled mean AHI bias from ResMed CPAP studies was - 1.01 with pooled LoAs from - 3.55 to 1.54 (I2 = 17.5%), and from Respironics CPAP studies, pooled mean AHI bias was - 0.59 with pooled LoAs from - 3.22 to 2.05 (I2 = 0%). Pooled percentage errors (corresponding to LoAs) from four ResMed CPAP studies, four Respironics CPAP studies, and the F&P CPAP study were 73%, 59%, and 112%, respectively. A review of the literature for this meta-analysis also revealed lack of uniformity not only in the CPAP manufacturers' respiratory events scoring criteria but also in that used for PSGs across the studies analyzed. CONCLUSIONS Even though the pooled results of mean AHI bias suggest good clinical agreement between AHIPSG and AHIFLOW, percentage errors calculated in this meta-analysis indicate the possibility of a significant degree of imprecision in the estimation of AHIFLOW by CPAP machines.
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Affiliation(s)
- Imran H Iftikhar
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Emory University School of Medicine, 613 Michael St., Atlanta, GA, USA.
- Atlanta Veterans Affairs Medical Center, Decatur, GA, USA.
| | - Ahmed BaHammam
- The University Sleep Disorders Center, Department of Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia
- Strategic Technologies Program of the National Plan for Sciences and Technology and Innovation in the Kingdom of Saudi Arabia (08-MED511-02), Riyadh, Saudi Arabia
| | - Haitham Jahrami
- Ministry of Health, Manama, Bahrain
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
| | - Octavian Ioachimescu
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Emory University School of Medicine, 613 Michael St., Atlanta, GA, USA
- Atlanta Veterans Affairs Medical Center, Decatur, GA, USA
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Husstedt I, Spiesshoefer J, Reinecke H, Giannoni A, Kahles F, Dreher M, Boentert M, Tuleta I. Bioimpedance based determination of cardiac index does not show enough trueness for point of care use in patients with systolic heart failure. J Clin Monit Comput 2023; 37:1229-1237. [PMID: 37074524 DOI: 10.1007/s10877-023-00987-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 02/21/2023] [Indexed: 04/20/2023]
Abstract
Cardiac output (CO) is a key parameter in diagnostics and therapy of heart failure (HF). The thermodilution method (TD) as gold standard for CO determination is an invasive procedure with corresponding risks. As an alternative, thoracic bioimpedance (TBI) has gained popularity for CO estimation as it is non-invasive. However, systolic heart failure (HF) itself might worsen its validity. The present study validated TBI against TD. In patients with and without systolic HF (LVEF ≤ 50% or > 50% and NT-pro-BNP < 125 pg/ml, respectively) right heart catheterization including TD was performed. TBI (Task Force Monitor©, CNSystems, Graz, Austria) was conducted semi-simultaneously. 14 patients with and 17 patients without systolic HF were prospectively enrolled in this study. In all participants, TBI was obtainable. Bland-Altman analysis indicated a mean bias of 0.3 L/min (limits of agreement ± 2.0 L/min, percentage error or PE 43.3%) for CO and a bias of -7.3 ml (limits of agreement ± 34 ml) for cardiac stroke volume (SV). PE was markedly higher in patients with compared to patients without systolic HF (54% vs. 35% for CO). Underlying systolic HF substantially decreases the validity of TBI for estimation of CO and SV. In patients with systolic HF, TBI clearly lacks diagnostic accuracy and cannot be recommended for point-of-care decision making. Depending on the definition of an acceptable PE, TBI may be considered sufficient when systolic HF is absent.Trial registration number: DRKS00018964 (German Clinical Trial Register, retrospectively registered).
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Affiliation(s)
- Imke Husstedt
- Department of Neurology with Institute for Translational Neurology, University of Muenster, Muenster, Germany.
| | - Jens Spiesshoefer
- Department of Pneumology and Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
- Institute of Life Sciences, Scuola Superiore Sant´Anna, Pisa, Italy
| | - Holger Reinecke
- Department of Cardiology I, University Hospital Muenster, Muenster, Germany
| | - Alberto Giannoni
- Institute of Life Sciences, Scuola Superiore Sant´Anna, Pisa, Italy
| | - Florian Kahles
- Cardiology and Cardiovascular Medicine Division, University Hospital RWTH Aachen, Aachen, Germany
| | - Michael Dreher
- Department of Pneumology and Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | - Matthias Boentert
- Department of Neurology with Institute for Translational Neurology, University of Muenster, Muenster, Germany
- Department of Medicine, UKM Marienhospital Steinfurt, Steinfurt, Germany
| | - Izabela Tuleta
- Department of Cardiology I, University Hospital Muenster, Muenster, Germany
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10
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Teixeira JP, Zeidman A, Beaubien-Souligny W, Cerdá J, Connor MJ, Eggleston K, Juncos LA, da Silva JR, Wells C, Yessayan L, Barker AB, McConville W, Speer R, Wille KM, Neyra JA, Tolwani A. Proceedings of the 2022 UAB CRRT Academy: Non-Invasive Hemodynamic Monitoring to Guide Fluid Removal with CRRT and Proliferation of Extracorporeal Blood Purification Devices. Blood Purif 2023; 52:857-879. [PMID: 37742622 DOI: 10.1159/000533573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 06/29/2023] [Indexed: 09/26/2023]
Abstract
In 2022, we celebrated the 15th anniversary of the University of Alabama at Birmingham (UAB) Continuous Renal Replacement Therapy (CRRT) Academy, a 2-day conference attended yearly by an international audience of over 100 nephrology, critical care, and multidisciplinary trainees and practitioners. This year, we introduce the proceedings of the UAB CRRT Academy, a yearly review of select emerging topics in the field of critical care nephrology that feature prominently in the conference. First, we review the rapidly evolving field of non-invasive hemodynamic monitoring and its potential to guide fluid removal by renal replacement therapy (RRT). We begin by summarizing the accumulating data associating fluid overload with harm in critical illness and the potential for harm from end-organ hypoperfusion caused by excessive fluid removal with RRT, underscoring the importance of accurate, dynamic assessment of volume status. We describe four applications of point-of-care ultrasound used to identify patients in need of urgent fluid removal or likely to tolerate fluid removal: lung ultrasound, inferior vena cava ultrasound, venous excess ultrasonography, and Doppler of the left ventricular outflow track to estimate stroke volume. We briefly introduce other minimally invasive hemodynamic monitoring technologies before concluding that additional prospective data are urgently needed to adapt these technologies to the specific task of fluid removal by RRT and to learn how best to integrate them into practical fluid-management strategies. Second, we focus on the growth of novel extracorporeal blood purification devices, starting with brief reviews of the inflammatory underpinnings of multiorgan dysfunction and the specific applications of pathogen, endotoxin, and/or cytokine removal and immunomodulation. Finally, we review a series of specific adsorptive technologies, several of which have seen substantial clinical use during the COVID-19 pandemic, describing their mechanisms of target removal, the limited existing data supporting their efficacy, ongoing and future studies, and the need for additional prospective trials.
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Affiliation(s)
- J Pedro Teixeira
- Division of Nephrology and Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Internal Medicine, University of New Mexico, Albuquerque, New Mexico, USA
| | - Amanda Zeidman
- Division of Nephrology, Department of Medicine, Institute for Critical Care Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | | | - Jorge Cerdá
- Department of Medicine, Nephrology, Albany Medical College, Albany, New York, USA
| | - Michael J Connor
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine and Division of Renal Medicine, Department of Medicine, Emory University, Atlanta, Georgia, USA
| | | | - Luis A Juncos
- Division of Nephrology, Department of Internal Medicine, Central Arkansas Veterans' Healthcare System, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | | | - Catherine Wells
- Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Lenar Yessayan
- Division of Nephrology, Department of Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Andrew B Barker
- Division of Critical Care Medicine, Department of Anesthesiology and Perioperative Medicine, University of Alabama Birmingham, Birmingham, Alabama, USA
| | - Wendy McConville
- School of Nursing, University of Alabama Birmingham, Birmingham, Alabama, USA
| | - Rajesh Speer
- Division of Nephrology, Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama, USA
| | - Keith M Wille
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama, USA
| | - Javier A Neyra
- Division of Nephrology, Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama, USA
| | - Ashita Tolwani
- Division of Nephrology, Department of Medicine, University of Alabama Birmingham, Birmingham, Alabama, USA
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11
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Oh C, Hong B. At the Right Place, at the Right Time. Reply to Vetrugno et al. Comparison between FlowTrac and Pulmonary Arterial Catheter in Off-Pump Cardiac Surgery Patients: "Why Did We Miss Our Appointment?". Comment on "Oh et al. Comparison between Fourth-Generation FloTrac/Vigileo System and Continuous Thermodilution Technique for Cardiac Output Estimation after Time Adjustment during Off-Pump Coronary Artery Bypass Graft Surgery: A Retrospective Cohort Study. J. Clin. Med. 2022, 11, 6093". J Clin Med 2023; 12:5772. [PMID: 37762714 PMCID: PMC10531544 DOI: 10.3390/jcm12185772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 08/30/2023] [Indexed: 09/29/2023] Open
Abstract
We thank Vetrugno et al. for their interest and comments [...].
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Affiliation(s)
- Chahyun Oh
- Department of Anesthesiology and Pain Medicine, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
- Department of Anesthesiology and Pain Medicine, College of Medicine, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Boohwi Hong
- Department of Anesthesiology and Pain Medicine, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
- Department of Anesthesiology and Pain Medicine, College of Medicine, Chungnam National University, Daejeon 34134, Republic of Korea
- Big Data Center, Biomedical Research Institute, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
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12
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Mladinov D, Isaza E, Gosling AF, Clark AL, Kukreja J, Brzezinski M. Perioperative Fluid Management. Anesthesiol Clin 2023; 41:613-629. [PMID: 37516498 DOI: 10.1016/j.anclin.2023.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2023]
Abstract
The medical complexity of the geriatric patients has been steadily rising. Still, as outcomes of surgical procedures in the elderly are improving, centers are pushing boundaries. There is also a growing appreciation of the importance of perioperative fluid management on postoperative outcomes, especially in the elderly. Optimal fluid management in this cohort is challenging due to the combination of age-related physiological changes in organ function, increased comorbid burden, and larger fluid shifts during more complex surgical procedures. The current state-of-the-art approach to fluid management in the perioperative period is outlined.
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Affiliation(s)
- Domagoj Mladinov
- Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, 75 Francis Street, CWN-L1, Boston, MA 02115, USA
| | - Erin Isaza
- University of California, San Francisco, School of Medicine, 500 Parnassus Avenue, MU 405 W San Francisco, CA 94143, USA
| | - Andre F Gosling
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, 619 19th Street South, JT 845D, Birmingham, AL 35249, USA
| | - Adrienne L Clark
- Department of Anesthesia and Perioperative Care, University of California, 500 Parnassus Avenue, MU 405 W San Francisco, CA 94143, USA
| | - Jasleen Kukreja
- Division of Cardiothoracic Surgery, Department of Surgery, University of California, 500 Parnassus Avenue, MU 405 W San Francisco, CA 94143, USA
| | - Marek Brzezinski
- Department of Anesthesia and Perioperative Care, University of California, VA Medical Center-San Francisco, 4150 Clement Street, San Francisco CA 94121, USA.
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13
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Dang TH, Jang GY, Lee K, Oh TI. Motion Artifacts Reduction for Noninvasive Hemodynamic Monitoring of Conscious Patients Using Electrical Impedance Tomography: A Preliminary Study. SENSORS (BASEL, SWITZERLAND) 2023; 23:s23115308. [PMID: 37300035 DOI: 10.3390/s23115308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/19/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023]
Abstract
Electrical impedance tomography (EIT) can monitor the real-time hemodynamic state of a conscious and spontaneously breathing patient noninvasively. However, cardiac volume signal (CVS) extracted from EIT images has a small amplitude and is sensitive to motion artifacts (MAs). This study aimed to develop a new algorithm to reduce MAs from the CVS for more accurate heart rate (HR) and cardiac output (CO) monitoring in patients undergoing hemodialysis based on the source consistency between the electrocardiogram (ECG) and the CVS of heartbeats. Two signals were measured at different locations on the body through independent instruments and electrodes, but the frequency and phase were matched when no MAs occurred. A total of 36 measurements with 113 one-hour sub-datasets were collected from 14 patients. As the number of motions per hour (MI) increased over 30, the proposed algorithm had a correlation of 0.83 and a precision of 1.65 beats per minute (BPM) compared to the conventional statical algorithm of a correlation of 0.56 and a precision of 4.04 BPM. For CO monitoring, the precision and upper limit of the mean ∆CO were 3.41 and 2.82 L per minute (LPM), respectively, compared to 4.05 and 3.82 LPM for the statistical algorithm. The developed algorithm could reduce MAs and improve HR/CO monitoring accuracy and reliability by at least two times, particularly in high-motion environments.
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Affiliation(s)
- Thi Hang Dang
- Department of Medical Engineering, Graduate School, Kyung Hee University, Seoul 02453, Republic of Korea
| | - Geuk Young Jang
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Bundang Hospital, Seongnam-si 13620, Republic of Korea
| | - Kyounghun Lee
- Medical Science Research Institute, Kyung Hee University Medical Center, Seoul 02447, Republic of Korea
| | - Tong In Oh
- Department of Medical Engineering, Graduate School, Kyung Hee University, Seoul 02453, Republic of Korea
- Department of Biomedical Engineering, School of Medicine, Kyung Hee University, Seoul 02453, Republic of Korea
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14
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Borrelli N, Grimaldi N, Papaccioli G, Fusco F, Palma M, Sarubbi B. Telemedicine in Adult Congenital Heart Disease: Usefulness of Digital Health Technology in the Assistance of Critical Patients. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:5775. [PMID: 37239504 PMCID: PMC10218523 DOI: 10.3390/ijerph20105775] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 04/26/2023] [Accepted: 05/06/2023] [Indexed: 05/28/2023]
Abstract
The number of adults with congenital heart disease (ACHD) has progressively increased in recent years to surpass that of children. This population growth has produced a new demand for health care. Moreover, the 2019 coronavirus pandemic has caused significant changes and has underlined the need for an overhaul of healthcare delivery. As a result, telemedicine has emerged as a new strategy to support a patient-based model of specialist care. In this review, we would like to highlight the background knowledge and offer an integrated care strategy for the longitudinal assistance of ACHD patients. In particular, the emphasis is on recognizing these patients as a special population with special requirements in order to deliver effective digital healthcare.
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Affiliation(s)
| | | | | | | | | | - Berardo Sarubbi
- Adult Congenital Heart Disease Unit, AO Dei Colli-Monaldi Hospital, 80131 Naples, Italy
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15
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Jerrome S, Joseph S, Niranjana B, Vidya S, Kumaragurupari T, Balagiri S, Senthilkumar VA, Krishnadas SR. Evaluation of the agreement and reliability of Transpalpebral Tonometers compared with Goldmann Applanation Tonometer - A systematic Review and Meta-Analysis Protocol. Indian J Ophthalmol 2023; 71:2225-2229. [PMID: 37202955 PMCID: PMC10391437 DOI: 10.4103/ijo.ijo_3321_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023] Open
Abstract
In 2020, the global prevalence of glaucoma was estimated to be 76 million and it was projected to increase to 111.8 million by 2040. Accurate intraocular pressure (IOP) measurement is imperative in glaucoma management since it is the only modifiable risk factor. Numerous studies have compared the reliability of IOP measured using transpalpebral tonometers and Goldmann applanation tonometry (GAT). This systematic review and meta-analysis aims to update the existing literature with a reliability and agreement comparison of transpalpebral tonometers against the gold standard GAT for IOP measurement among individuals presenting for ophthalmic examinations. The data collection will be performed using a predefined search strategy through electronic databases. Prospective methods-comparison studies published between January 2000 and September 2022 will be included. Studies will be deemed eligible if they report empirical findings on the agreement between transpalpebral tonometry and Goldmann applanation tonometry. The standard deviation and limits of agreement between each study and their pooled estimate along with weights and percentage of error will be reported using a forest plot. Cochrane's Q test and the I2 statistic will be used to assess heterogeneity, and the publication bias will be investigated using a funnel plot, Begg's and Egger's tests. The review results will provide additional evidence on the reliability of transpalpebral tonometers that, in turn, could possibly assist practitioners to make informed decision about using it as a screening or diagnostic device for clinical practice, outreach camps, or home-based screening. Institutional Ethics Committee registration number: RET202200390. PROSPERO Registration Number: CRD42022321693.
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Affiliation(s)
- Selvaraj Jerrome
- Research Division, Lions Aravind Institute of Community Ophthalmology, Aravind Eye Care System, Madurai, Tamil Nadu, India
| | - Sanil Joseph
- Research Division, Lions Aravind Institute of Community Ophthalmology, Aravind Eye Care System, Madurai, Tamil Nadu, India; Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, East Melbourne; Department of Surgery (Ophthalmology), The University of Melbourne, Melbourne, Australia
| | | | - S Vidya
- Department of Glaucoma, Aravind Eye Hospital, Madurai, Tamil Nadu, India
| | - Thandavarayan Kumaragurupari
- Library and Information Centre, Aravind Eye Hospitals and Postgraduate Institute of Ophthalmology, Madurai, Tamil Nadu, India
| | - Sundar Balagiri
- Department of Glaucoma, Aravind Eye Hospital, Madurai, Tamil Nadu, India
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16
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Parulekar P, Powys-Lybbe J, Bassett P, Roques S, Snazelle M, Millen G, Harris T. Comparison of cardiac index measurements in intensive care patients using continuous wave vs. pulsed wave echo-Doppler compared to pulse contour cardiac output. Intensive Care Med Exp 2023; 11:23. [PMID: 37106217 PMCID: PMC10140233 DOI: 10.1186/s40635-023-00499-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 02/10/2023] [Indexed: 04/29/2023] Open
Abstract
PURPOSE Cardiac index (CI) assessments are commonly used in critical care to define shock aetiology and guide resuscitation. Echocardiographic assessment is non-invasive and has high levels of agreement with thermodilution assessment of CI. CI assessment is derived from the velocity time integral (VTI) assessed using pulsed wave (PW) doppler at the level of the left ventricular outflow tract divided by body mass index. Continuous wave (CW) doppler through the aortic valve offers an alternative means to assess VTI and may offer better assessment at high velocities. METHODS We performed a single centre, prospective, observational study in a 15-bed intensive care unit in a busy district general hospital. Patients had simultaneous measurements of cardiac index by Pulse Contour Cardiac Output (PiCCO) (thermodilution), transthoracic echocardiographic PW-VTI and CW-VTI. Mean differences were measured with Bland-Altman limits of agreement and percentage error (PE) calculations. RESULTS Data were collected on 52 patients. 71% were supported with noradrenaline with or without additional inotropic or vasopressor agents. Mean CIs were: CW-VTI 2.7 L/min/m2 (range 0.78-5.11, SD 0.92). PW-VTI 2.33 L/min/m2 (range 0.77-5.40, SD 0.90) and PiCCO 2.86 L/min/m2 (range 1.50-5.56, SD 0.93). CW-VTI and PiCCO mean difference was - 0.16 L/min/m2 PE 43.5%. PW-VTI and PiCCO had a mean difference of - 0.54 L/min/m2 PE 38.6%. CW-VTI and PW-VTI had a mean difference of 0.38 L/min/m2 PE 46.0%. CONCLUSIONS CI derived from both CW-VTI and PW-VTI methods underestimate CI compared to PiCCO, with the CW-VTI method having closer values overall to PiCCO. CW-VTI may offer a more accurate assessment of CI. If using Critchley's PE cutoff of 30%, none of the doppler methods may accurately reflect the actual cardiac index.
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Affiliation(s)
- Prashant Parulekar
- Intensive Care and Acute Medicine, East Kent Hospitals University NHS Foundation Trust, William Harvey Hospital, London, UK.
| | | | | | - Seb Roques
- East Kent Hospitals University NHS Foundation Trust, William Harvey, London, UK
| | - Mark Snazelle
- East Kent Hospitals University NHS Foundation Trust, William Harvey, London, UK
| | - Gemma Millen
- East Kent Hospitals University NHS Foundation Trust, William Harvey, London, UK
| | - Tim Harris
- East Kent Hospitals University NHS Foundation Trust, William Harvey, London, UK
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17
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Suriani I, van Houte J, de Boer EC, van Knippenberg L, Manzari S, Mischi M, Bouwman RA. Carotid Doppler ultrasound for non-invasive haemodynamic monitoring: a narrative review. Physiol Meas 2023; 43. [PMID: 36179705 DOI: 10.1088/1361-6579/ac96cb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/30/2022] [Indexed: 11/11/2022]
Abstract
Objective.Accurate haemodynamic monitoring is the cornerstone in the management of critically ill patients. It guides the optimization of tissue and organ perfusion in order to prevent multiple organ failure. In the past decades, carotid Doppler ultrasound (CDU) has been explored as a non-invasive alternative for long-established invasive haemodynamic monitoring techniques. Considering the large heterogeneity in reported studies, we conducted a review of the literature to clarify the current status of CDU as a haemodynamic monitoring tool.Approach.In this article, firstly an overview is given of the equipment and workflow required to perform a CDU exam in clinical practice, the limitations and technical challenges potentially faced by the CDU sonographer, and the cerebrovascular mechanisms that may influence CDU measurement outcomes. The following chapter describes alternative techniques for non-invasive haemodynamic monitoring, detailing advantages and limitations compared to CDU. Next, a comprehensive review of the literature regarding the use of CDU for haemodynamic monitoring is presented. Furthermore, feasibility aspects, training requirements and technical developments of CDU are addressed.Main results.Based on the outcomes of these studies, we assess the applicability of CDU-derived parameters within three clinical domains (cardiac output, volume status, and fluid responsiveness), and amongst different patient groups. Finally, recommendations are provided to improve the quality and standardization of future research and clinical practice in this field.Significance.Although CDU is not yet interchangeable with invasive 'gold standard' cardiac output monitoring, the present work shows that certain CDU-derived parameters prove promising in the context of functional haemodynamic monitoring.
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Affiliation(s)
- Irene Suriani
- Eindhoven University of Technology, Groene Loper 3, 5612 AE Eindhoven, The Netherlands
| | - Joris van Houte
- Catharina Hospital Michelangelolaan 2, 5623 EJ Eindhoven, The Netherlands
| | - Esmée C de Boer
- Eindhoven University of Technology, Groene Loper 3, 5612 AE Eindhoven, The Netherlands
| | - Luuk van Knippenberg
- Eindhoven University of Technology, Groene Loper 3, 5612 AE Eindhoven, The Netherlands
| | - Sabina Manzari
- Philips Research High Tech Campus 34, 5656 AE Eindhoven, The Netherlands
| | - Massimo Mischi
- Eindhoven University of Technology, Groene Loper 3, 5612 AE Eindhoven, The Netherlands
| | - R Arthur Bouwman
- Eindhoven University of Technology, Groene Loper 3, 5612 AE Eindhoven, The Netherlands.,Catharina Hospital Michelangelolaan 2, 5623 EJ Eindhoven, The Netherlands
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18
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Real-Time Measurements of Relative Tidal Volume and Stroke Volume Using Electrical Impedance Tomography with Spatial Filters: A Feasibility Study in a Swine Model Under Normal and Reduced Ventilation. Ann Biomed Eng 2023; 51:394-409. [PMID: 35960417 DOI: 10.1007/s10439-022-03040-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 07/28/2022] [Indexed: 01/25/2023]
Abstract
Continuous monitoring of both hemodynamic and respiratory parameters would be beneficial to patients, e.g., those in intensive care unit. The objective of this exploratory animal study was to test the feasibility of simultaneous measurements of relative tidal volume (rTV) and relative stroke volume (rSV) using an electrical impedance tomography (EIT) device equipped with a new real-time source separation algorithm implemented as two spatial filters. Five pigs were anesthetized and mechanically ventilated. The supplied tidal volume from a mechanical ventilator was reduced to 70, 50 and 30% from the 100% normal volume to simulate hypoventilation. The respiratory volume signal and cardiac volume signal were generated by applying the spatial filters to the acquired EIT data, from which values of rTV and rSV were extracted. The measured rTV values were compared with the TV values from the mechanical ventilator using the four-quadrant concordance analysis method. For changes in TV, the concordance rate in each animal ranged from 81.8% to 100%, while it was 92.5% when the data from all five animals were pooled together. When the measured rTV values for each animal were scaled to the absolute TVEIT values in mL using the TVVent data from the mechanical ventilator, the smallest 95% limits of agreement (LoA) were - 6.04 and 7.44 mL for the 70% ventilation level, and the largest 95% LoA were - 18.1 and 19.4 mL for the 50% ventilation level. The percentage error between TVEIT and TVVent was 10.3%. Although similar statistical analyses on rSV data could not be performed due to limited intra-animal variability, changes in rSV values measured by the EIT device were comparable to those measured by an invasive hemodynamic monitor. In this animal study, we were able to demonstrate the feasibility of an EIT device for noninvasive and simultaneous measurements of rTV and rSV in real time. However, the performance of the real-time source separation method needs to be further validated on animals and human subjects, particularly over a wide range of SV values. Future clinical studies are needed to assess the potential usefulness of the new method in dynamic cardiopulmonary monitoring and explore other clinical applications.
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19
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Loreto M, Pisanti M, Celentani M, Pasta G, Erman A, Santangelo C, Giaccari LG, Sansone P, Villani R. Non invasive hemodynamic monitoring for fluids and blood resuscitation during placenta praevia accreta cesarean delivery: a retrospective observational study. JOURNAL OF ANESTHESIA, ANALGESIA AND CRITICAL CARE (ONLINE) 2022; 2:54. [PMID: 37386677 DOI: 10.1186/s44158-022-00083-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/06/2022] [Indexed: 07/01/2023]
Abstract
BACKGROUND We carry out a retrospective observational analysis of clinical records of patients with major placenta praevia who underwent cesarean section surgery over a period of 20 months in our hospital. Out of a total of 40 patients, 20 were subjected to Goal-Directed Therapy (GDT) implemented with non-invasive hemodynamic monitoring using the EV1000 ClearSight system (Group I) and 20 to standard hemodynamic monitoring (Group II). Given the risk of conspicuous blood loss, this study evaluate the impact on maternal and fetal health of GDT relative to standard hemodynamic monitoring. RESULTS Average total infusion of fluids was 1600 +/- 350 ml. Use of blood products occurred in 29 patients (72,5%), of which 11 had a hysterectomy and 8 were treated with Bakri Balloons. For 2 patients > 1000 mL of concentrated red blood cells were used. When stroke volume index SVI dropped below 35 mL/m2/beat, it responded well to the infusion of at least 2 crystalloid boluses (5 ml/kg) in 7 patients. Cardiac index (CI) increased in 8 patients in concomitance with a reduction in medium arterial pressure (MAP), but the use of ephedrine (10 mg iv) re-established acceptable baseline values. Group I means are higher than Group II means for MAP, lower for RBC usage, end-of-surgery maternal lactates and fetal pH, and for LOS. Statistical analysis determines that the null hypotheses of equalities between Groups I and II can be rejected for all measures apart from MAP at baseline and induction. Proportions of serious complications in Groups I and II are respectively 10% and 32% and Boschloo's test rejects the null of equality of proportions against the alternative hypothesis of lower proportion of occurrence in Group I than in Group II. CONCLUSIONS Hypovolemia can lead to vasoconstriction and inadequate perfusion with decreased oxygen delivery to organs and peripheral tissues and ultimately cause organ dysfunction. Despite the small sample size due to the rarity of the pathology, our statistical analysis finds evidence in favor of more favorable clinical outcomes for patients who received GDT implemented with non-invasive hemodynamic monitoring infusion relative to patients who received standard hemodynamic monitoring.
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Affiliation(s)
- Maria Loreto
- Hospital of National Relevance "A. Cardarelli", Naples, Italy
| | - Massimo Pisanti
- Hospital of National Relevance "A. Cardarelli", Naples, Italy
| | - Marco Celentani
- Department of Economics, Universidad Carlos III de Madrid, Madrid, Spain
| | - Gilda Pasta
- National Cancer Institute IRCCS - "G. Pascale" Foundation, Naples, Italy
| | - Alfredo Erman
- Fatebenefratelli "S. Giovanni di Dio" Hospital, Naples, Italy
| | | | | | | | - Romolo Villani
- Hospital of National Relevance "A. Cardarelli", Naples, Italy
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20
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Kallab R, Sudy R, Dos Santos Rocha A, Diaper J, Petak F, Keli Barcelos G, Habre W. Invasive and non-invasive assessment of macro- and micro-circulatory effects of vasopressors during sevoflurane anesthesia in a pediatric experimental model: A randomized trial. Paediatr Anaesth 2022; 32:1129-1137. [PMID: 35662322 DOI: 10.1111/pan.14506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 05/25/2022] [Accepted: 05/29/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND While non-invasive assessment of macro- and micro-circulation has the promise to optimize anesthesia management, evidence is lacking for the relationship between invasive and non-invasive measurements of cardiac output and microcirculatory indices. AIMS We aimed to compare the abilities of non-invasive techniques to detect changes in macro- and micro-circulation following deep anesthesia and subsequent restoration of the compromised hemodynamic by routinely used vasopressors in a randomized experimental study. METHODS A 20%-25% drop in mean arterial pressure was induced by sevoflurane in anesthetized mechanically ventilated just-weaned piglets (n = 12) prior to the administration of vasopressors in random order (dopamine, ephedrine, noradrenaline, and phenylephrine). Simultaneous transpulmonary thermodilution cardiac output assessment with the invasive pulse index continuous contour (PiCCO) method was compared with non-invasive estimates obtained with electrical conductivity (ICON) and echo Doppler (Cardio Q). Changes in microcirculation were characterized by sublingual red blood cell velocity, jugular cerebral venous oxygen saturation, and arterial lactate. MAIN OUTCOME MEASURES Cardiac output indices obtained by invasive and non-invasive methods. RESULTS Changes in cardiac output measured invasively and non-invasively correlated significantly after sevoflurane (r = .78, p = .003 and r = .76, p = .006 between PiCCO and ICON or Cardio Q, respectively). Following the administration of vasopressors, invasive and non-invasive cardiac output assessments were unrelated with significant correlations observed only between PiCCO and ICON after dopamine and ephedrine. Sevoflurane-induced hypotension decreased jugular cerebral venous oxygen saturation significantly and was recovered by all vasopressors. Sevoflurane and vasopressors had no effect on red blood cell velocity, which increased only after dopamine. No consistent changes in lactate were observed during the study period. CONCLUSIONS The results of this study suggest that non-invasive cardiac output measurements may not accurately reflect changes in macrocirculation after hemodynamic optimization by vasopressors. Due to the incoherence between macro- and micro-circulation, monitoring microcirculation is essential to guide patient management.
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Affiliation(s)
- Rita Kallab
- Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva and University of Geneva, Geneva, Switzerland.,Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Roberta Sudy
- Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva and University of Geneva, Geneva, Switzerland
| | - Andre Dos Santos Rocha
- Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva and University of Geneva, Geneva, Switzerland.,Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - John Diaper
- Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva and University of Geneva, Geneva, Switzerland
| | - Ferenc Petak
- Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Gleicy Keli Barcelos
- Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Walid Habre
- Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva and University of Geneva, Geneva, Switzerland.,Paediatric Anesthesia Unit, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland
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Geller BJ, Sinha SS, Kapur NK, Bakitas M, Balsam LB, Chikwe J, Klein DG, Kochar A, Masri SC, Sims DB, Wong GC, Katz JN, van Diepen S. Escalating and De-escalating Temporary Mechanical Circulatory Support in Cardiogenic Shock: A Scientific Statement From the American Heart Association. Circulation 2022; 146:e50-e68. [PMID: 35862152 DOI: 10.1161/cir.0000000000001076] [Citation(s) in RCA: 54] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The use of temporary mechanical circulatory support in cardiogenic shock has increased dramatically despite a lack of randomized controlled trials or evidence guiding clinical decision-making. Recommendations from professional societies on temporary mechanical circulatory support escalation and de-escalation are limited. This scientific statement provides pragmatic suggestions on temporary mechanical circulatory support device selection, escalation, and weaning strategies in patients with common cardiogenic shock causes such as acute decompensated heart failure and acute myocardial infarction. The goal of this scientific statement is to serve as a resource for clinicians making temporary mechanical circulatory support management decisions and to propose standardized approaches for their use until more robust randomized clinical data are available.
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22
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Detection of a Stroke Volume Decrease by Machine-Learning Algorithms Based on Thoracic Bioimpedance in Experimental Hypovolaemia. SENSORS 2022; 22:s22145066. [PMID: 35890746 PMCID: PMC9316072 DOI: 10.3390/s22145066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/23/2022] [Accepted: 07/01/2022] [Indexed: 02/04/2023]
Abstract
Compensated shock and hypovolaemia are frequent conditions that remain clinically undetected and can quickly cause deterioration of perioperative and critically ill patients. Automated, accurate and non-invasive detection methods are needed to avoid such critical situations. In this experimental study, we aimed to create a prediction model for stroke volume index (SVI) decrease based on electrical cardiometry (EC) measurements. Transthoracic echo served as reference for SVI assessment (SVI-TTE). In 30 healthy male volunteers, central hypovolaemia was simulated using a lower body negative pressure (LBNP) chamber. A machine-learning algorithm based on variables of EC was designed. During LBNP, SVI-TTE declined consecutively, whereas the vital signs (arterial pressures and heart rate) remained within normal ranges. Compared to heart rate (AUC: 0.83 (95% CI: 0.73–0.87)) and systolic arterial pressure (AUC: 0.82 (95% CI: 0.74–0.85)), a model integrating EC variables (AUC: 0.91 (0.83–0.94)) showed a superior ability to predict a decrease in SVI-TTE ≥ 20% (p = 0.013 compared to heart rate, and p = 0.002 compared to systolic blood pressure). Simulated central hypovolaemia was related to a substantial decline in SVI-TTE but only minor changes in vital signs. A model of EC variables based on machine-learning algorithms showed high predictive power to detect a relevant decrease in SVI and may provide an automated, non-invasive method to indicate hypovolaemia and compensated shock.
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23
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Sumbel L, Nagaraju L, Ogbeifun H, Agarwal A, Bhalala U. Comparing cardiac output measurements using electrical cardiometry versus phase contrast cardiac magnetic resonance imaging. PROGRESS IN PEDIATRIC CARDIOLOGY 2022. [DOI: 10.1016/j.ppedcard.2022.101551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Trending ability of cardiac output measurements using electrical cardiometry during abdominal surgery: A cohort study. Eur J Anaesthesiol 2022; 39:619-622. [PMID: 35759293 DOI: 10.1097/eja.0000000000001653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Abstract
PURPOSE OF REVIEW The purpose of this article is to review various contemporary cardiac output (CO) measurement technologies available and their utility in critically ill patients. RECENT FINDINGS CO measurement devices can be invasive, minimally invasive, or noninvasive depending upon their method of CO measurement. All devices have pros and cons, with pulmonary artery catheter (PAC) being the gold standard. The invasive techniques are more accurate; however, their invasiveness can cause more complications. The noninvasive devices predict CO via mathematical modeling with several assumptions and are thus prone to errors in clinical situations. Recently, PAC has made a comeback into clinical practice especially in cardiac intensive care units (ICUs). Critical care echocardiography (CCE) is an upcoming tool that not only provides CO but also helps in differential diagnosis. Lack of proper training and nonavailability of equipment are the main hindrances to the wide adoption of CCE. SUMMARY PAC thermodilution for CO measurement is still gold standard and most suitable in patients with cardiac pathology and with experienced user. CCE offers an alternative to thermodilution and is suitable for all ICUs; however, structural training is required.
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Affiliation(s)
- Virendra K Arya
- Department of Anesthesiology, Perioperative and Pain Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB, Canada
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26
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Lorenzen U, Grünewald M. [Targeted hemodynamic monitoring in the operating theatre: what for and by what means?]. Anasthesiol Intensivmed Notfallmed Schmerzther 2022; 57:246-262. [PMID: 35451032 DOI: 10.1055/a-1472-4285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Goal directed hemodynamic monitoring and the balance in goal directed therapy between adequate fluid/volume therapy and the application of vasoactive or inotropic drugs are the basic elements of modern perioperative therapy.Surgical procedures should be accompanied by as few side effects and complications as possible. Nevertheless, the number of postoperative complications remains surprisingly high, despite of the modern surgical procedures. Anticipation of potential complications in the perioperative period and their rapid treatment build a core competence of anesthesiological action. Thus, it is clear that anesthesia plays a central role in this balancing act.This article aims to provide an overview of the application of the currently available perioperative goal directed hemodynamic monitoring. The current possibilities are discussed by using a case example and an outlook on the future of hemodynamic monitoring is given.
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Affiliation(s)
- Ulf Lorenzen
- Klinik für Anästhesiologie und Operative Intensivmedizin, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Kiel
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27
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Assessment of fluid unresponsiveness guided by lung ultrasound in abdominal surgery: a prospective cohort study. Sci Rep 2022; 12:1350. [PMID: 35079044 PMCID: PMC8789825 DOI: 10.1038/s41598-022-05251-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 01/10/2022] [Indexed: 12/02/2022] Open
Abstract
A fluid challenge can generate an infraclinical interstitial syndrome that may be detected by the appearance of B-lines by lung ultrasound. Our objective was to evaluate the appearance of B-lines as a diagnostic marker of preload unresponsiveness and postoperative complications in the operating theater. We conducted a prospective, bicentric, observational study. Adult patients undergoing abdominal surgery were included. Stroke volume (SV) was determined before and after a fluid challenge with 250 mL crystalloids (Delta-SV) using esophageal Doppler monitoring. Responders were defined by an increase of Delta-SV > 10% after fluid challenge. B-lines were collected at four bilateral predefined zones (right and left anterior and lateral). Delta-B-line was defined as the number of newly appearing B-lines after a fluid challenge. Postoperative pulmonary complications were prospectively recorded according to European guidelines. In total, 197 patients were analyzed. After a first fluid challenge, 67% of patients were responders and 33% were non-responders. Delta-B-line was significantly higher in non-responders than responders [4 (2–7) vs 1 (0–3), p < 0.0001]. Delta-B-line was able to diagnose fluid non-responders with an area under the curve of 0.74 (95% CI 0.67–0.80, p < 0.0001). The best threshold was two B-lines with a sensitivity of 80% and a specificity of 57%. The final Delta-B-line could predict postoperative pulmonary complications with an area under the curve of 0.74 (95% CI 0.67–0.80, p = 0.0004). Delta-B-line of two or more detected in four lung ultrasound zones can be considered to be a marker of preload unresponsiveness after a fluid challenge in abdominal surgery. The objectives and procedures of the study were registered at Clinicaltrials.gov (NCT03502460; Principal investigator: Stéphane BAR, date of registration: April 18, 2018).
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28
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Vallier S, Bouchet JB, Desebbe O, Francou C, Raphael D, Tardy B, Gergele L, Morel J. Slope analysis for the prediction of fluid responsiveness by a stepwise PEEP elevation recruitment maneuver in mechanically ventilated patients. BMC Anesthesiol 2022; 22:4. [PMID: 34979928 PMCID: PMC8722149 DOI: 10.1186/s12871-021-01544-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 11/29/2021] [Indexed: 11/30/2022] Open
Abstract
Objective Assessment of fluid responsiveness is problematic in intensive care unit patients. Lung recruitment maneuvers (LRM) can be used as a functional test to predict fluid responsiveness. We propose a new test to predict fluid responsiveness in mechanically ventilated patients by analyzing the variations in central venous pressure (CVP) and systemic arterial parameters during a prolonged sigh breath LRM without the use of a cardiac output measuring device. Design Prospective observational cohort study. Setting Intensive Care Unit, Saint-Etienne University Central Hospital. Patients Patients under mechanical ventilation, equipped with invasive arterial blood pressure, CVP, pulse contour analysis (PICCO™), requiring volume expansion, with no right ventricular dysfunction. Interventions. None. Measurements and main results CVP, systemic arterial parameters and stroke volume (SV) were recorded during prolonged LRM followed by a 500 mL fluid expansion to asses fluid responsiveness. 25 patients were screened and 18 patients analyzed. 9 patients were responders to volume expansion and 9 were not. Evaluation of hemodynamic parameters suggested the use of a linear regression model. Slopes for systolic arterial pressure, pulse pressure (PP), CVP and SV were all significantly different between responders and non-responders during the pressure increase phase of LRM (STEP-UP) (p = 0.022, p = 0.014, p = 0.006 and p = 0.038, respectively). PP and CVP slopes during STEP-UP were strongly predictive of fluid responsiveness with an AUC of 0.926 (95% CI, 0.78 to 1.00), sensitivity = 100%, specificity = 89% and an AUC = 0.901 (95% CI, 0.76 to 1.00), sensibility = 78%, specificity = 100%, respectively. Combining sensitivity of PP and specificity of CVP, prediction of fluid responsiveness can be achieved with 100% sensitivity and 100% specificity (AUC = 0.96; 95% CI, 0.90 to 1.00). One patient showed inconclusive values using the grey zone approach (5.5%). Conclusions In patients under mechanical ventilation with no right heart dysfunction, the association of PP and CVP slope analysis during a prolonged sigh breath LRM seems to offer a very promising method for prediction of fluid responsiveness without the use and associated cost of a cardiac output measurement device. Trial registration NCT04304521, IRBN902018/CHUSTE. Registered 11 March 2020, Fluid responsiveness predicted by a stepwise PEEP elevation recruitment maneuver in mechanically ventilated patients (STEP-PEEP)
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Affiliation(s)
- Sylvain Vallier
- Department of Anesthesiology and Intensive Care, Elsan Alpes-Belledonne Clinic, Grenoble, France.
| | - Jean-Baptiste Bouchet
- Department of Anesthesiology and Intensive Care, Etienne University Hospital, Jean-Monnet University, SaintSaint-Etienne, France
| | - Olivier Desebbe
- Department of Anesthesiology and Intensive Care, Ramsay Sante Sauvegarde Clinic, Lyon, France
| | - Camille Francou
- Department of Anesthesiology and Intensive Care, Etienne University Hospital, Jean-Monnet University, SaintSaint-Etienne, France
| | - Darren Raphael
- Department of Anesthesiology & Perioperative Care, University of California, Irvine, USA
| | - Bernard Tardy
- Centre d'Investigation Clinique - CIC 1408, Etienne University Hospital, Jean-Monnet University, SaintSaint-Etienne, France
| | - Laurent Gergele
- Department of Anesthesiology and Intensive Care, Ramsay Sante HPL Clinic, Saint-Etienne, France
| | - Jérôme Morel
- Department of Anesthesiology and Intensive Care, Etienne University Hospital, Jean-Monnet University, SaintSaint-Etienne, France
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Van Wyk L, Gupta S, Lawrenson J, de Boode WP. Accuracy and Trending Ability of Electrical Biosensing Technology for Non-invasive Cardiac Output Monitoring in Neonates: A Systematic Qualitative Review. Front Pediatr 2022; 10:851850. [PMID: 35372144 PMCID: PMC8968571 DOI: 10.3389/fped.2022.851850] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/14/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Electrical biosensing technology (EBT) is an umbrella term for non-invasive technology utilizing the body's fluctuating resistance to electrical current flow to estimate cardiac output. Monitoring cardiac output in neonates may allow for timely recognition of hemodynamic compromise and allow for prompt therapy, thereby mitigating adverse outcomes. For a new technology to be safely used in the clinical environment for therapeutic decisions, it must be proven to be accurate, precise and be able to track temporal changes. The aim of this systematic review was to identify and analyze studies that describe the accuracy, precision, and trending ability of EBT to non-invasively monitor Left ventricular cardiac output and/or stroke volume in neonates. METHODS A qualitative systematic review was performed. Studies were identified from PubMed NCBI, SCOPUS, and EBSCOHost up to November 2021, where EBT technologies were analyzed in neonates, in comparison to a reference technology. Outcome measures were bias, limits of agreement, percentage error for agreement studies and data from 4-quadrant and polar plots for trending studies. Effect direction plots were used to present results. RESULTS Fifteen neonatal studies were identified, 14 for agreement and 1 for trending analysis. Only thoracic electrical biosensing technology (TEBT), with transthoracic echocardiography (TTE) as the comparator, studies were available for analyzes. High heterogeneity existed between studies. An equal number of studies showed over- and underestimation of left ventricular output parameters. All studies showed small bias, wide limits of agreement, with most studies having a percentage error >30%. Sub-analyses for respiratory support mode, cardiac anomalies and type of technology showed similar results. The single trending study showed poor concordance, high angular bias, and poor angular concordance. DISCUSSION Overall, TEBT shows reasonable accuracy, poor precision, and non-interchangeability with TTE. However, high heterogeneity hampered proper analysis. TEBT should be used with caution in the neonatal population for monitoring and determining therapeutic interventions. The use of TEBT trend monitoring has not been sufficiently studied and requires further evaluation in future trials.
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Affiliation(s)
- Lizelle Van Wyk
- Division Neonatology, Department of Pediatrics and Child Health, Stellenbosch University and Tygerberg Children's Hospital, Cape Town, South Africa
| | - Samir Gupta
- Department of Engineering and Medical Physics, Durham University, Durham, United Kingdom.,Division of Neonatology, Sidra Medicine, Doha, Qatar
| | - John Lawrenson
- Pediatric Cardiology Unit, Department of Pediatrics and Child Health, Stellenbosch University, Cape Town, South Africa
| | - Willem-Pieter de Boode
- Division of Neonatology, Department of Perinatology, Radboud University Medical Center, Radboud Institute for Health Sciences, Amalia Children's Hospital, Nijmegen, Netherlands
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30
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Hutchings SD, Watchorn J, McDonald R, Jeffreys S, Bates M, Watts S, Kirkman E. Quantification of stroke volume in a simulated healthy volunteer model of traumatic haemorrhage; a comparison of two non-invasive monitoring devices using error grid analysis alongside traditional measures of agreement. PLoS One 2021; 16:e0261546. [PMID: 34941918 PMCID: PMC8699736 DOI: 10.1371/journal.pone.0261546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 12/03/2021] [Indexed: 11/19/2022] Open
Abstract
Introduction Haemorrhage is a leading cause of death following traumatic injury and the early detection of hypovolaemia is critical to effective management. However, accurate assessment of circulating blood volume is challenging when using traditional vital signs such as blood pressure. We conducted a study to compare the stroke volume (SV) recorded using two devices, trans-thoracic electrical bioimpedance (TEB) and supra-sternal Doppler (SSD), against a reference standard using trans- thoracic echocardiography (TTE). Methods A lower body negative pressure (LBNP) model was used to simulate hypovolaemia and in half of the study sessions lower limb tourniquets were applied as these are common in military practice and can potentially affect some haemodynamic monitoring systems. In order to provide a clinically relevant comparison we constructed an error grid alongside more traditional measures of agreement. Results 21 healthy volunteers aged 18–40 were enrolled and underwent 2 sessions of LBNP, with and without lower limb tourniquets. With respect to absolute SV values Bland Altman analysis showed significant bias in both non-tourniquet and tourniquet strands for TEB (-42.5 / -49.6 ml), rendering further analysis impossible. For SSD bias was minimal but percentage error was unacceptably high (35% / 48%). Degree of agreement for dynamic change in SV, assessed using 4 quadrant plots showed a seemingly acceptable concordance rate for both TEB (86% / 93%) and SSD (90% / 91%). However, when results were plotted on an error grid, constructed based on expert clinical opinion, a significant minority of measurement errors were identified that had potential to lead to moderate or severe patient harm. Conclusion Thoracic bioimpedance and suprasternal Doppler both demonstrated measurement errors that had the potential to lead to clinical harm and caution should be applied in interpreting the results in the detection of early hypovolaemia following traumatic injury.
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Affiliation(s)
- Sam D. Hutchings
- Department of Inflammation Biology, School of Immunology and Microbial Sciences, King’s College London, London, United Kingdom
- Academic Department of Military Anaesthesia and Critical Care, Royal Centre for Defence Medicine, Birmingham, United Kingdom
- * E-mail:
| | - Jim Watchorn
- Department of Inflammation Biology, School of Immunology and Microbial Sciences, King’s College London, London, United Kingdom
| | - Rory McDonald
- Academic Department of Military Anaesthesia and Critical Care, Royal Centre for Defence Medicine, Birmingham, United Kingdom
| | - Su Jeffreys
- Academic Department of Military Anaesthesia and Critical Care, Royal Centre for Defence Medicine, Birmingham, United Kingdom
| | - Mark Bates
- Defence Science and Technology Laboratory, Porton Down, Wiltshire, United Kingdom
| | - Sarah Watts
- Defence Science and Technology Laboratory, Porton Down, Wiltshire, United Kingdom
| | - Emrys Kirkman
- Defence Science and Technology Laboratory, Porton Down, Wiltshire, United Kingdom
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31
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Yazdi D, Sridaran S, Smith S, Centen C, Patel S, Wilson E, Gillon L, Kapur S, Tracy JA, Lewine K, Systrom DM, MacRae CA. Noninvasive Scale Measurement of Stroke Volume and Cardiac Output Compared With the Direct Fick Method: A Feasibility Study. J Am Heart Assoc 2021; 10:e021893. [PMID: 34873927 PMCID: PMC9075258 DOI: 10.1161/jaha.121.021893] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Objective markers of cardiac function are limited in the outpatient setting and may be beneficial for monitoring patients with chronic cardiac conditions. We assess the accuracy of a scale, with the ability to capture ballistocardiography, electrocardiography, and impedance plethysmography signals from a patient's feet while standing on the scale, in measuring stroke volume and cardiac output compared with the gold-standard direct Fick method. Methods and Results Thirty-two patients with unexplained dyspnea undergoing level 3 invasive cardiopulmonary exercise test at a tertiary medical center were included in the final analysis. We obtained scale and direct Fick measurements of stroke volume and cardiac output before and immediately after invasive cardiopulmonary exercise test. Stroke volume and cardiac output from a cardiac scale and the direct Fick method correlated with r=0.81 and r=0.85, respectively (P<0.001 each). The mean absolute error of the scale estimated stroke volume was -1.58 mL, with a 95% limits of agreement of -21.97 to 18.81 mL. The mean error for the scale estimated cardiac output was -0.31 L/min, with a 95% limits of agreement of -2.62 to 2.00 L/min. The changes in stroke volume and cardiac output before and after exercise were 78.9% and 96.7% concordant, respectively, between the 2 measuring methods. Conclusions In a proof-of-concept study, this novel scale with cardiac monitoring abilities may allow for noninvasive, longitudinal measures of cardiac function. Using the widely accepted form factor of a bathroom scale, this method of monitoring can be easily integrated into a patient's lifestyle.
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Affiliation(s)
- Daniel Yazdi
- Bodyport IncSan FranciscoCA
- One Brave IdeaBrigham and Women’s HospitalBostonMA
| | | | | | | | | | - Evan Wilson
- One Brave IdeaBrigham and Women’s HospitalBostonMA
| | - Leah Gillon
- One Brave IdeaBrigham and Women’s HospitalBostonMA
| | - Sunil Kapur
- Cardiovascular DivisionBrigham and Women’s HospitalBostonMA
| | - Julie A. Tracy
- Cardiovascular DivisionBrigham and Women’s HospitalBostonMA
| | | | - David M. Systrom
- Division of Pulmonary and Critical Care MedicineDepartment of MedicineBrigham and Women’s HospitalBostonMA
| | - Calum A. MacRae
- One Brave IdeaBrigham and Women’s HospitalBostonMA
- Cardiovascular DivisionBrigham and Women’s HospitalBostonMA
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32
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Orter S, Möstl S, Bachler M, Hoffmann F, Mayer CC, Kaniusas E, Reisinger M, Wassertheurer S, Tank J, Jordan J, Hametner B. A comparison between left ventricular ejection time measurement methods during physiological changes induced by simulated microgravity. Exp Physiol 2021; 107:213-221. [PMID: 34921742 PMCID: PMC9303723 DOI: 10.1113/ep090103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/08/2021] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? There are two aims of this study. First, we validated easy-to-use oscillometric LVET against the classical echocardiographic LVET. Second, we investigated the progression of LVETI, PEPI, QS2I and PEP/LVET ratio during 60 days HDT. What is the main finding and its importance? LVETosci and LVETecho showed good agreement in effect direction. Thus, LVETosci might be a useful measure to evaluate cardiovascular responses during space flight. Moreover, the approach may have utility for individual follow up of patients with altered ejection times. Furthermore, significant effects of 60 days HDT were captured by measurements of LVETI, PEPI, QS2I and PEP/LVET ratio. ABSTRACT Easy to detect systolic time intervals may be used as parameters reflecting cardiovascular deconditioning. We compared left ventricular ejection time (LVET) measured via ultrasound doppler on the left ventricular outflow tract with oscillometric measured LVET measured at the brachialis. Furthermore, we assessed the progression of left ventricular ejection time index (LVETI), pre-ejection period index (PEPI) the Weissler index (PEP/LVET) and the total electromechanical systole index (QS2I) during prolonged strict head-down tilt bedrest including 16 male and 8 female subjects. Simultaneous oscillometric and echocardiographic LVET measurements show significant correlation (r = 0.53 with p = .0084 before bedrest and r = 0.73 with p < .05 at the last day of bedrest). The shortening of LVET during head-down tilt bedrest measured with both approaches is highly concordant in their effect direction with a concordance rate of 0.96. Our results furthermore report a significant decrease of LVETI (p < .0001) and QS2I (p = .0992) as well as a prolongation of PEPI (p = .0049) and PEP/LVET (p = .0003) during head down tilt bedrest over 60 days. 4 days after bedrest LVETI fully recovers to its baseline value. Because of the relationship between shortening of LVETI and heart failure progression, the easy-to-use oscillometric method might be not only a useful measure to evaluate the cardiovascular system during space flights, butcould also be of high value in a clinical setting. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Stefan Orter
- Center for Health & Bioresources, AIT Austrian Institute of Technology, Vienna, Austria.,Institute of Electrodynamics, Microwave and Circuit Engineering, Vienna University of Technology, Vienna, Austria
| | - Stefan Möstl
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Martin Bachler
- Center for Health & Bioresources, AIT Austrian Institute of Technology, Vienna, Austria
| | - Fabian Hoffmann
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Christopher C Mayer
- Center for Health & Bioresources, AIT Austrian Institute of Technology, Vienna, Austria
| | - Eugenijus Kaniusas
- Institute of Electrodynamics, Microwave and Circuit Engineering, Vienna University of Technology, Vienna, Austria
| | - Michaela Reisinger
- Center for Health & Bioresources, AIT Austrian Institute of Technology, Vienna, Austria
| | | | - Jens Tank
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Jens Jordan
- Institute of Aerospace Medicine, German Aerospace Center, Cologne, Germany
| | - Bernhard Hametner
- Center for Health & Bioresources, AIT Austrian Institute of Technology, Vienna, Austria
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Lee K, Jang GY, Kim Y, Woo EJ. Multi-channel Trans-impedance Leadforming for Cardiopulmonary Monitoring: Algorithm Development and Feasibility Assessment using In Vivo Animal Data. IEEE Trans Biomed Eng 2021; 69:1964-1974. [PMID: 34855581 DOI: 10.1109/tbme.2021.3132012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE The objectives of this study were to (1) develop a multi-channel trans-impedance leadforming method for beat-to-beat stroke volume (SV) and breath-by-breath tidal volume (TV) measurements and (2) assess its feasibility on an existing in vivo animal dataset. METHODS A deterministic leadforming algorithm was developed to extract a cardiac volume signal (CVS) and a respiratory volume signal (RVS) from 208-channel trans-impedance data acquired every 20 ms by an electrical impedance tomography (EIT) device. SVEIT and TVEIT values were computed as a valley-to-peak value in the CVS and RVS, respectively. The method was applied to the existing dataset from five mechanically-ventilated pigs undergoing ten mini-fluid challenges. An invasive hemodynamic monitor was used in the arterial pressure-based cardiac output (APCO) mode to simultaneously measure SVAPCO values while a mechanical ventilator provided TVVent values. RESULTS The leadforming method could reliably extract the CVS and RVS from the 208-channel trans-impedance data measured with the EIT device, from which SV<sub>EIT</sub> and TV<sub>EIT</sub> were computed. The SV<sub>EIT</sub> and TV<sub>EIT</sub> values were comparable to those from the invasive hemodynamic monitor and mechanical ventilator. Using the data from 5 pigs and a simple calibration method to remove bias, the error in SV<sub>EIT<sub> and TV<sub>EIT<sub> was 9.5% and 5.4%, respectively. CONCLUSION We developed a new leadforming method for the EIT device to robustly extract both SV and TV values in a deterministic fashion. Future animal and clinical studies are needed to validate this leadforming method in various subject populations. SIGNIFICANCE The leadforming method could be an integral component for a new cardiopulmonary monitor in the future to simultaneously measure SV and TV noninvasively, which would be beneficial to patients.
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Sigmundsson TS, Öhman T, Hallbäck M, Suarez-Sipmann F, Wallin M, Oldner A, Hällsjö-Sander C, Björne H. Comparison between capnodynamic and thermodilution method for cardiac output monitoring during major abdominal surgery: An observational study. Eur J Anaesthesiol 2021; 38:1242-1252. [PMID: 34155171 PMCID: PMC8631141 DOI: 10.1097/eja.0000000000001566] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Cardiac output (CO) monitoring is the basis of goal-directed treatment for major abdominal surgery. A capnodynamic method estimating cardiac output (COEPBF) by continuously calculating nonshunted pulmonary blood flow has previously shown good agreement and trending ability when evaluated in mechanically ventilated pigs. OBJECTIVES To compare the performance of the capnodynamic method of CO monitoring with transpulmonary thermodilution (COTPTD) in patients undergoing major abdominal surgery. DESIGN Prospective, observational, method comparison study. Simultaneous measurements of COEPBF and COTPTD were performed before incision at baseline and before and after increased (+10 cmH2O) positive end-expiratory pressure (PEEP), activation of epidural anaesthesia and intra-operative events of hypovolemia and low CO. The first 25 patients were ventilated with PEEP 5 cmH2O (PEEP5), while in the last 10 patients, lung recruitment followed by individual PEEP adjustment (PEEPadj) was performed before protocol start. SETTING Karolinska University Hospital, Stockholm, Sweden. PATIENTS In total, 35 patients (>18 years) scheduled for major abdominal surgery with advanced hemodynamic monitoring were included in the study. MAIN OUTCOME MEASURES AND ANALYSIS Agreement and trending ability between COEPBF and COTPTD at different clinical moments were analysed with Bland--Altman and four quadrant plots. RESULTS In total, 322 paired values, 227 in PEEP5 and 95 in PEEPadj were analysed. Respectively, the mean COEPBF and COTPTD were 4.5 ± 1.0 and 4.8 ± 1.1 in the PEEP5 group and 4.9 ± 1.2 and 5.0 ± 1.0 l min-1 in the PEEPadj group. Mean bias (levels of agreement) and percentage error (PE) were -0.2 (-2.2 to 1.7) l min-1 and 41% for the PEEP5 group and -0.1 (-1.7 to 1.5) l min-1 and 31% in the PEEPadj group. Concordance rates during changes in COEPBF and COTPTD were 92% in the PEEP5 group and 90% in the PEEPadj group. CONCLUSION COEPBF provides continuous noninvasive CO estimation with acceptable performance, which improved after lung recruitment and PEEP adjustment, although not interchangeable with COTPTD. This method may become a tool for continuous intra-operative CO monitoring during general anaesthesia in the future. TRIAL REGISTRATION Clinicaltrials.gov identifier: NCT03444545.
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Affiliation(s)
- Thorir S Sigmundsson
- From the Perioperative Medicine and Intensive Care, Karolinska University Hospital, Solna (TSS, TÖ, AO, CH-S, HB), Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm (TSS, TÖ, MW, AO, CH-S, HB), Maquet Critical Care AB, Solna (MH, MW), Department of Intensive Care, Hospital Universitario de La Princesa, Madrid, Spain and Department of Surgical Sciences, Section of Anaesthesiology and Critical Care, Hedenstierna's Laboratory, Uppsala University, Uppsala, Sweden (FSS) and CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain (FSS)
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Ko RE, Jang GY, Chung CR, Lee JY, Oh TI, Suh GY, Kim Y, Woo EJ. Noninvasive Beat-To-Beat Stroke Volume Measurements to Determine Preload Responsiveness During Mini-Fluid Challenge in a Swine Model: A Preliminary Study. Shock 2021; 56:850-856. [PMID: 33534400 DOI: 10.1097/shk.0000000000001739] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
ABSTRACT Cardiac output (CO) is an important parameter in fluid management decisions for treating hemodynamically unstable patients in intensive care unit. The gold standard for CO measurements is the thermodilution method, which is an invasive procedure with intermittent results. Recently, electrical impedance tomography (EIT) has emerged as a new method for noninvasive measurements of stroke volume (SV). The objectives of this paper are to compare EIT with an invasive pulse contour analysis (PCA) method in measuring SV during mini-fluid challenge in animals and determine preload responsiveness with EIT. Five pigs were anesthetized and mechanically ventilated. After removing 25% to 30% of the total blood from each animal, multiple fluid injections were conducted. The EIT device successfully tracked changes in SV beat-to-beat during varying volume states, i.e., from hypovolemia and preload responsiveness to target volume and volume overload. From a total of 50 100-mL fluid injections on five pigs (10 injections per pig), the preload responsiveness value was as large as 32.3% in the preload responsiveness state while in the volume overload state it was as low as -4.9%. The bias of the measured SV data using EIT and PCA was 0 mL, and the limits of agreement were ±3.6 mL in the range of 17.6 mL to 51.0 mL. The results of the animal experiments suggested that EIT is capable of measuring beat-to-beat SV changes during mini-fluid challenge and determine preload responsiveness. Further animal and clinical studies will be needed to demonstrate the feasibility of the EIT method as a new tool for fluid management.
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Affiliation(s)
- Ryoung Eun Ko
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Geuk Young Jang
- Department of Biomedical Engineering, Kyung Hee University, Seoul, Korea
| | - Chi Ryang Chung
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jin Young Lee
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Tong In Oh
- Department of Biomedical Engineering, Kyung Hee University, Seoul, Korea
| | - Gee Young Suh
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Yongmin Kim
- Department of Creative IT Engineering, POSTECH, Pohang, Korea
| | - Eung Je Woo
- Department of Biomedical Engineering, Kyung Hee University, Seoul, Korea
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A performance comparison of the most commonly used minimally invasive monitors of cardiac output. Can J Anaesth 2021; 68:1668-1682. [PMID: 34374024 DOI: 10.1007/s12630-021-02085-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 06/25/2021] [Accepted: 06/28/2021] [Indexed: 10/20/2022] Open
Abstract
BACKGROUND Shock is common in critically ill and injured patients. Survival during shock is highly dependent on rapid restoration of tissue oxygenation with therapeutic goals based on cardiac output (CO) optimization. Despite the clinical availability of numerous minimally invasive monitors of CO, limited supporting performance data are available. METHODS Following approval of the University of Saskatchewan Animal Research Ethics Board, we assessed the performance and trending ability of PiCCOplus™, FloTrac™, and CardioQ-ODM™ across a range of CO states in pigs. In addition, we assessed the ability of invasive mean arterial blood pressure (iMAP) to follow changes in CO using a periaortic transit-time flow probe as the reference method. Statistical analysis was performed with function-fail, bias and precision, percent error, and linear regression at all flow, low-flow (> 1 standard deviation [SD] below the mean), and high-flow (> 1 SD above the mean) CO conditions. RESULTS We made a total of 116,957 paired CO measurements. The non-invasive CO monitors often failed to provide a CO value (CardioQ-ODM: 40.6% failed measurements; 99% confidence interval [CI], 38.5 to 42.6; FloTrac: 9.6% failed measurements; 99% CI, 8.7 to 10.5; PiCCOplus: 4.7% failed measurements; 99% CI, 4.5 to 4.9; all comparisons, P < 0.001). The invasive mean arterial pressure provided zero failures, failing less often than any of the tested CO monitors (all comparisons, P < 0.001). The PiCCOplus was most interchangeable with the flow probe at all flow states: PiCCOplus (20% error; 99% CI, 19 to 22), CardioQ-ODM (25% error; 99% CI, 23 to 27), FloTrac (34% error; 99% CI, 32 to 38) (all comparisons, P < 0.001). At low-flow states, CardioQ-ODM (43% error; 99% CI, 32 to 63) and Flotrac (45% error; 99% CI, 33 to 70) had similar interchangeability (P = 0.07), both superior to PiCCOplus (48% error; 99% CI, 42 to 60) (P < 0.001). Regarding CO trending, the CardioQ-ODM (correlation coefficient, 0.82; 99% CI, 0.81 to 0.83) was statistically superior to other monitors including iMAP, but at low flows iMAP (correlation coefficient, 0.58; 99% CI, 0.58 to 0.60) was superior to all minimally invasive CO monitors (all comparisons P < 0.001). CONCLUSIONS None of the minimally invasive monitors of CO performed well at all tested flows. Invasive mean arterial blood pressure most closely tracked CO change at critical flow states.
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Mukkamala R, Kohl BA, Mahajan A. Comparison of accuracy of two uncalibrated pulse contour cardiac output monitors in off-pump coronary artery bypass surgery patients using pulmonary artery catheter-thermodilution as a reference. BMC Anesthesiol 2021; 21:189. [PMID: 34246222 PMCID: PMC8272317 DOI: 10.1186/s12871-021-01415-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 06/17/2021] [Indexed: 12/02/2022] Open
Abstract
Background Cardiac output (CO) is a key measure of adequacy of organ and tissue perfusion, especially in critically ill or complex surgical patients. CO monitoring technology continues to evolve. Recently developed CO monitors rely on unique algorithms based on pulse contour analysis of an arterial blood pressure (ABP) waveform. The objective of this investigation was to compare the accuracy of two monitors using different methods of pulse contour analysis – the Retia Argos device and the Edwards Vigileo-FloTrac device – with pulmonary artery catheter (PAC)-thermodilution as a reference. Methods Fifty-eight patients undergoing off-pump coronary artery bypass surgery formed the study cohort. A total of 572 triplets of CO measurements from each device – Argos, Vigileo-FloTrac (third generation), and thermodilution – were available before and after interventions (e.g., vasopressors, fluids, and inotropes). Bland–Altman analysis accounting for repeated measurements per subject and concordance analysis were applied to assess the accuracy of the CO values and intervention-induced CO changes of each pulse contour device against thermodilution. Cluster bootstrapping was employed to statistically compare the root-mean-squared-errors (RMSE = √(μ2 + σ2), where μ and σ are the Bland–Altman bias and precision errors) and concordance rates of the two devices. Results The RMSE (mean (95% confidence intervals)) for CO values was 1.16 (1.00–1.32) L/min for the Argos device and 1.54 (1.33–1.77) L/min for the Vigileo-FloTrac device; the concordance rate for intervention-induced CO changes was 87 (82–92)% for the Argos device and 72 (65–78)% for the Vigileo-FloTrac device; and the RMSE for the CO changes was 17 (15–19)% for the Argos device and 21 (19–23)% for the Vigileo-FloTrac device (p < 0.0167 for all comparisons). Conclusions In comparison with CO measured by the PAC, the Argos device proved to be more accurate than the Vigileo-FloTrac device in CO trending and absolute CO measurement in patients undergoing off-pump coronary artery bypass surgery. Supplementary Information The online version contains supplementary material available at 10.1186/s12871-021-01415-5.
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Affiliation(s)
- Ramakrishna Mukkamala
- Department of Anesthesiology and Perioperative Medicine and Department of Bioengineering, University of Pittsburgh, 408 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA, 15261, USA. .,Retia Medical, Valhalla, NY, USA.
| | - Benjamin A Kohl
- Department of Anesthesiology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Aman Mahajan
- Department of Anesthesiology and Perioperative Medicine and Department of Bioengineering, University of Pittsburgh, A-1305 Scaife Hall, 3550 Terrace Street, Pittsburgh, PA, 15261, USA
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Souza RSE, Melo WBD, Freire CMV, Vilas Boas WW. Comparative study between suprasternal and apical windows: a user-friendly cardiac output measurement for the anesthesiologist. Braz J Anesthesiol 2021:S0104-0014(21)00264-5. [PMID: 34246688 PMCID: PMC10362443 DOI: 10.1016/j.bjane.2021.02.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 02/18/2021] [Accepted: 02/27/2021] [Indexed: 10/20/2022] Open
Abstract
INTRODUCTION Transthoracic echocardiography is a safe and readily available tool for noninvasive monitoring of Cardiac Output (CO). The use of the suprasternal window situated at the sternal notch can be an alternative approach for estimating blood flow. The present study aimed to compare two methods of CO calculation. We compared the descending aorta Velocity-Time Integral (VTI) measurement from the suprasternal window view with the standard technique to determine CO that uses VTI measurements from the LVOT (Left Ventricular Outflow Tract) view. We also aimed to find out whether after basic training a non-echocardiographer operator can obtain reproducible measurements of VTI using this approach. METHODS In the first part of the study, 26 patients without known cardiovascular diseases were evaluated and VTI data were acquired from the suprasternal window by a non-echocardiographer and an echocardiographer. Next, 17 patients were evaluated by an echocardiographer only and VTI and CO measurements were obtained from suprasternal and apical windows. Data were analyzed using the Bland and Altman method (BA), correlation and regression. RESULTS We found a strong correlation between measurements obtained by a non-expert and an expert echocardiographer and detected that an inexperienced trainee can acquire VTI measurements from the suprasternal window view. Regarding agreement between CO measurements, data obtained showed a positive correlation and the Bland and Altman analysis presented a total variation of 38.9%. CONCLUSION Regarding accuracy, it is likely that TTE (Transthoracic Echocardiogram) measurements of CO from the suprasternal window view are comparable to other minimally invasive techniques currently available. Due to its user-friendliness and low cost, it can be a convenient technique for obtaining perioperative hemodynamic measurements, even by inexperienced operators.
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Affiliation(s)
- Rafaela Souto E Souza
- Hospital das Clínicas da Universidade Federal de Minas Gerais (HC/UFMG), Belo Horizonte, MG, Brazil.
| | - Wendhell Barros de Melo
- Hospital das Clínicas da Universidade Federal de Minas Gerais (HC/UFMG), Belo Horizonte, MG, Brazil
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Ylikauma LA, Ohtonen PP, Erkinaro TM, Vakkala MA, Liisanantti JH, Satta JU, Juvonen TS, Kaakinen TI. Bioreactance and fourth-generation pulse contour methods in monitoring cardiac index during off-pump coronary artery bypass surgery. J Clin Monit Comput 2021; 36:879-888. [PMID: 34037919 PMCID: PMC8150147 DOI: 10.1007/s10877-021-00721-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 05/18/2021] [Indexed: 11/30/2022]
Abstract
The pulmonary artery catheter (PAC) is considered the gold standard for cardiac index monitoring. Recently new and less invasive methods to assess cardiac performance have been developed. The aim of our study was to assess the reliability of a non-invasive monitor utilizing bioreactance (Starling SV) and a non-calibrated mini-invasive pulse contour device (FloTrac/EV1000, fourth-generation software) compared to bolus thermodilution technique with PAC (TDCO) during off-pump coronary artery bypass surgery (OPCAB). In this prospective study, 579 simultaneous intra- and postoperative cardiac index measurements obtained with Starling SV, FloTrac/EV1000 and TDCO were compared in 20 patients undergoing OPCAB. The agreement of data was investigated by Bland-Altman plots, while trending ability was assessed by four-quadrant plots with error grids. In comparison with TDCO, Starling SV was associated with a bias of 0.13 L min-1 m-2 (95% confidence interval, 95% CI, 0.07 to 0.18), wide limits of agreement (LOA, - 1.23 to 1.51 L min-1 m-2), a percentage error (PE) of 60.7%, and poor trending ability. In comparison with TDCO, FloTrac was associated with a bias of 0.01 L min-1 m-2 (95% CI - 0.05 to 0.06), wide LOA (- 1.27 to 1.29 L min-1 m-2), a PE of 56.8% and poor trending ability. Both Starling SV and fourth-generation FloTrac showed acceptable mean bias but imprecision due to wide LOA and high PE, and poor trending ability. These findings indicate limited reliability in monitoring cardiac index in patients undergoing OPCAB.
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Affiliation(s)
- Laura Anneli Ylikauma
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland.
| | - Pasi Petteri Ohtonen
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland.,Division of Operative Care, Oulu University Hospital, Oulu, Finland
| | - Tiina Maria Erkinaro
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Merja Annika Vakkala
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Janne Henrik Liisanantti
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Jari Uolevi Satta
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Tatu Sakari Juvonen
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland.,Department of Cardiac Surgery, Heart and Lung Center, Helsinki University Central Hospital, Helsinki University Hospital, Helsinki, Finland
| | - Timo Ilari Kaakinen
- Medical Research Center Oulu, Research Group of Surgery, Anesthesiology and Intensive Care Medicine, Oulu University Hospital and University of Oulu, Oulu, Finland
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Van Wyk L, Smith J, Lawrenson J, Lombard CJ, de Boode WP. Bioreactance-derived haemodynamic parameters in the transitional phase in preterm neonates: a longitudinal study. J Clin Monit Comput 2021; 36:861-870. [PMID: 33983533 DOI: 10.1007/s10877-021-00718-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 05/06/2021] [Indexed: 11/26/2022]
Abstract
Bioreactance (BR) is a novel, non-invasive technology that is able to provide minute-to-minute monitoring of cardiac output and additional haemodynamic variables. This study aimed to determine the values for BR-derived haemodynamic variables in stable preterm neonates during the transitional period. A prospective observational study was performed in a group of stable preterm (< 37 weeks) infants in the neonatal service of Tygerberg Children's Hospital, Cape Town, South Africa. All infants underwent continuous bioreactance (BR) monitoring until 72 h of life. Sixty three preterm infants with a mean gestational age of 31 weeks and mean birth weight of 1563 g were enrolled. Summary data and time series graphs were drawn for BR-derived heart rate, non-invasive blood pressure, stroke volume, cardiac output and total peripheral resistance index. All haemodynamic parameters were significantly associated with postnatal age, after correction for clinical variables (gestational age, birth weight, respiratory support mode). To our knowledge, this is the first paper to present longitudinal BR-derived haemodynamic variable data in a cohort of stable preterm infants, not requiring invasive ventilation or inotropic support, during the first 72 h of life. Bioreactance-derived haemodynamic monitoring is non-invasive and offers the ability to simultaneously monitor numerous haemodynamic parameters of global systemic blood flow. Moreover, it may provide insight into transitional physiology and its pathophysiology.
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Affiliation(s)
- Lizelle Van Wyk
- Division Neonatology, Dept. Pediatrics & Child Health, Stellenbosch University and Tygerberg Children's Hospital, Cape Town, South Africa.
| | - Johan Smith
- Division Neonatology, Dept. Pediatrics & Child Health, Stellenbosch University and Tygerberg Children's Hospital, Cape Town, South Africa
| | - John Lawrenson
- Pediatric Cardiology Unit, Dept. Pediatrics & Child Health, Stellenbosch University, Cape Town, South Africa
| | - Carl J Lombard
- Division of Epidemiology and Biostatistics, Department of Global Health, Stellenbosch University, Cape Town, South Africa
- Biostatistics Unit, South African Medical Research Council, Cape Town, South Africa
| | - Willem Pieter de Boode
- Division of Neonatology, Dept. of Perinatology, Radboud University Medical Center, Radboud Institute for Health Sciences, Amalia Children's Hospital, Nijmegen, The Netherlands
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Yealy DM, Mohr NM, Shapiro NI, Venkatesh A, Jones AE, Self WH. Early Care of Adults With Suspected Sepsis in the Emergency Department and Out-of-Hospital Environment: A Consensus-Based Task Force Report. Ann Emerg Med 2021; 78:1-19. [PMID: 33840511 DOI: 10.1016/j.annemergmed.2021.02.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Indexed: 12/12/2022]
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Anand G, Yu Y, Lowe A, Kalra A. Bioimpedance analysis as a tool for hemodynamic monitoring: overview, methods and challenges. Physiol Meas 2021; 42. [PMID: 33607637 DOI: 10.1088/1361-6579/abe80e] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 02/19/2021] [Indexed: 12/14/2022]
Abstract
Recent advances in hemodynamic monitoring have seen the advent of non-invasive methods which offer ease of application and improve patient comfort. Bioimpedance Analysis or BIA is one of the currently employed non-invasive techniques for hemodynamic monitoring. Impedance Cardiography (ICG), one of the implementations of BIA, is widely used as a non-invasive procedure for estimating hemodynamic parameters such as stroke volume (SV) and cardiac output (CO). Even though BIA is not a new diagnostic technique, it has failed to gain consensus as a reliable measure of hemodynamic parameters. Several devices have emerged for estimating CO using ICG which are based on evolving methodologies and techniques to calculate SV. However, the calculations are generally dependent on the electrode configurations (whole body, segmental or localised) as well as the accuracy of different techniques in tracking blood flow changes. Blood volume changes, concentration of red blood cells, pulsatile velocity profile and ambient temperature contribute to the overall conductivity of blood and hence its impedance response during flow. There is a growing interest in investigating limbs for localised BIA to estimate hemodynamic parameters such as pulse wave velocity. As such, this paper summarises the current state of hemodynamic monitoring through BIA in terms of different configurations and devices in the market. The conductivity of blood flow has been emphasized with contributions from both volume and velocity changes during flow. Recommendations for using BIA in hemodynamic monitoring have been mentioned highlighting the suitable range of frequencies (1 kHz-1 MHz) as well as safety considerations for a BIA setup. Finally, current challenges in using BIA such as geometry assumption and inaccuracies have been discussed while mentioning potential advantages of a multi-frequency analysis to cover all the major contributors to blood's impedance response during flow.
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Affiliation(s)
- Gautam Anand
- Institute of Biomedical Technologies, Auckland University of Technology, Auckland, New Zealand
| | - Yang Yu
- Institute of Biomedical Technologies, Auckland University of Technology, Auckland, New Zealand
| | - Andrew Lowe
- Institute of Biomedical Technologies, Auckland University of Technology, Auckland, New Zealand
| | - Anubha Kalra
- Institute of Biomedical Technologies, Auckland University of Technology, Auckland, New Zealand
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Kouz K, Michard F, Bergholz A, Vokuhl C, Briesenick L, Hoppe P, Flick M, Schön G, Saugel B. Agreement between continuous and intermittent pulmonary artery thermodilution for cardiac output measurement in perioperative and intensive care medicine: a systematic review and meta-analysis. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2021; 25:125. [PMID: 33781307 PMCID: PMC8006374 DOI: 10.1186/s13054-021-03523-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 03/01/2021] [Indexed: 01/22/2023]
Abstract
BACKGROUND Pulmonary artery thermodilution is the clinical reference method for cardiac output monitoring. Because both continuous and intermittent pulmonary artery thermodilution are used in clinical practice it is important to know whether cardiac output measurements by the two methods are clinically interchangeable. METHODS We performed a systematic review and meta-analysis of clinical studies comparing cardiac output measurements assessed using continuous and intermittent pulmonary artery thermodilution in adult surgical and critically ill patients. 54 studies with 1522 patients were included in the analysis. RESULTS The heterogeneity across the studies was high. The overall random effects model-derived pooled estimate of the mean of the differences was 0.08 (95%-confidence interval 0.01 to 0.16) L/min with pooled 95%-limits of agreement of - 1.68 to 1.85 L/min and a pooled percentage error of 29.7 (95%-confidence interval 20.5 to 38.9)%. CONCLUSION The heterogeneity across clinical studies comparing continuous and intermittent pulmonary artery thermodilution in adult surgical and critically ill patients is high. The overall trueness/accuracy of continuous pulmonary artery thermodilution in comparison with intermittent pulmonary artery thermodilution is good (indicated by a pooled mean of the differences < 0.1 L/min). Pooled 95%-limits of agreement of - 1.68 to 1.85 L/min and a pooled percentage error of 29.7% suggest that continuous pulmonary artery thermodilution barely passes interchangeability criteria with intermittent pulmonary artery thermodilution. PROSPERO registration number CRD42020159730.
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Affiliation(s)
- Karim Kouz
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
| | | | - Alina Bergholz
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
| | - Christina Vokuhl
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
| | - Luisa Briesenick
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
| | - Phillip Hoppe
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
| | - Moritz Flick
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
| | - Gerhard Schön
- Institute of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Bernd Saugel
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany. .,Outcomes Research Consortium, Cleveland, OH, USA.
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Tidal volume and stroke volume changes caused by respiratory events during sleep and their relationship with OSA severity: a pilot study. Sleep Breath 2021; 25:2025-2038. [PMID: 33683548 DOI: 10.1007/s11325-021-02334-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 02/03/2021] [Accepted: 02/19/2021] [Indexed: 10/22/2022]
Abstract
PURPOSE Breath-by-breath tidal volume (TV) and beat-by-beat stroke volume (SV) were continuously measured in patients with OSA undergoing polysomnography (PSG). The objectives were to (1) determine the changes in TV/SV in response to respiratory events and (2) assess the relationship between these changes and the disease severity. METHODS From the PSG data of nine patients with OSA, six different types of respiratory events were identified, i.e., flow limitation (FL), respiratory effort related arousal (RERA), hypopnea with arousal only (Ha), hypopnea with desaturation only (Hd), hypopnea with arousal and desaturation (Had), and apnea. The measured TV and SV values during and after each respiratory event were compared with the pre-event baseline values. RESULTS The mean TV/SV reductions during all hypopneas and apneas were 38.1%/4.2% and 70.5%/8.8%, respectively. Among three different hypopnea types, the reductions in TV during Hd and Had were significantly greater than those during Ha. The TV reductions during Ha and FL were similar. After RERA, Ha, Had, and apnea, there was an overshoot in TV and SV values, whereas there was no overshoot after FL and Hd. During RERA, there was no reduction in TV/SV. CONCLUSIONS The changes in TV during and after each type of respiratory event were significantly different in most cases. The changes in SV between hypopnea and apnea were different with statistical significance. The AHI does not properly account for the ventilation losses caused by respiratory events. Thus, TV measurements might be useful in the future in assessing the OSA severity in conjunction with the AHI.
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Virág M, Leiner T, Rottler M, Ocskay K, Molnar Z. Individualized Hemodynamic Management in Sepsis. J Pers Med 2021; 11:157. [PMID: 33672267 PMCID: PMC7926902 DOI: 10.3390/jpm11020157] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/13/2021] [Accepted: 02/18/2021] [Indexed: 02/06/2023] Open
Abstract
Hemodynamic optimization remains the cornerstone of resuscitation in the treatment of sepsis and septic shock. Delay or inadequate management will inevitably lead to hypoperfusion, tissue hypoxia or edema, and fluid overload, leading eventually to multiple organ failure, seriously affecting outcomes. According to a large international survey (FENICE study), physicians frequently use inadequate indices to guide fluid management in intensive care units. Goal-directed and "restrictive" infusion strategies have been recommended by guidelines over "liberal" approaches for several years. Unfortunately, these "fixed regimen" treatment protocols neglect the patient's individual needs, and what is shown to be beneficial for a given population may not be so for the individual patient. However, applying multimodal, contextualized, and personalized management could potentially overcome this problem. The aim of this review was to give an insight into the pathophysiological rationale and clinical application of this relatively new approach in the hemodynamic management of septic patients.
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Affiliation(s)
- Marcell Virág
- Institute for Translational Medicine, Medical School, University of Pécs, 7624 Pécs, Hungary; (M.V.); (T.L.); (M.R.); (K.O.)
- Szent György University Teaching Hospital of Fejér County, 8000 Székesfehérvár, Hungary
| | - Tamas Leiner
- Institute for Translational Medicine, Medical School, University of Pécs, 7624 Pécs, Hungary; (M.V.); (T.L.); (M.R.); (K.O.)
- Anaesthetic Department, North West Anglia NHS Foundation Trust, Hinchingbrooke Hospital, Huntingdon PE29 6NT, UK
| | - Mate Rottler
- Institute for Translational Medicine, Medical School, University of Pécs, 7624 Pécs, Hungary; (M.V.); (T.L.); (M.R.); (K.O.)
- Szent György University Teaching Hospital of Fejér County, 8000 Székesfehérvár, Hungary
| | - Klementina Ocskay
- Institute for Translational Medicine, Medical School, University of Pécs, 7624 Pécs, Hungary; (M.V.); (T.L.); (M.R.); (K.O.)
| | - Zsolt Molnar
- Institute for Translational Medicine, Medical School, University of Pécs, 7624 Pécs, Hungary; (M.V.); (T.L.); (M.R.); (K.O.)
- Department of Anesthesiology and Intensive Therapy, Poznan University of Medical Sciences, 61-701 Poznan, Poland
- Department of Anesthesiology and Intensive Therapy, Markusovszky Teaching Hospital, 9700 Szombathely, Hungary
- Multidisciplinary Doctoral School, University of Szeged, 6720 Szeged, Hungary
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Perioperative management and anaesthetic considerations in pelvic exenterations using Delphi methodology: results from the PelvEx Collaborative. BJS Open 2021; 5:6137382. [PMID: 33609393 PMCID: PMC7893479 DOI: 10.1093/bjsopen/zraa055] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 11/15/2020] [Indexed: 12/22/2022] Open
Abstract
Background The multidisciplinary perioperative and anaesthetic management of patients undergoing pelvic exenteration is essential for good surgical outcomes. No clear guidelines have been established, and there is wide variation in clinical practice internationally. This consensus statement consolidates clinical experience and best practice collectively, and systematically addresses key domains in the perioperative and anaesthetic management. Methods The modified Delphi methodology was used to achieve consensus from the PelvEx Collaborative. The process included one round of online questionnaire involving controlled feedback and structured participant response, two rounds of editing, and one round of web-based voting. It was held from December 2019 to February 2020. Consensus was defined as more than 80 per cent agreement, whereas less than 80 per cent agreement indicated low consensus. Results The final consensus document contained 47 voted statements, across six key domains of perioperative and anaesthetic management in pelvic exenteration, comprising preoperative assessment and preparation, anaesthetic considerations, perioperative management, anticipating possible massive haemorrhage, stress response and postoperative critical care, and pain management. Consensus recommendations were developed, based on consensus agreement achieved on 34 statements. Conclusion The perioperative and anaesthetic management of patients undergoing pelvic exenteration is best accomplished by a dedicated multidisciplinary team with relevant domain expertise in the setting of a specialized tertiary unit. This consensus statement has addressed key domains within the framework of current perioperative and anaesthetic management among patients undergoing pelvic exenteration, with an international perspective, to guide clinical practice, and has outlined areas for future clinical research.
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Li L, Ai Y, Huang L, Ai M, Peng Q, Zhang L. Can bioimpedance cardiography assess hemodynamic response to passive leg raising in critically ill patients: A STROBE-compliant study. Medicine (Baltimore) 2020; 99:e23764. [PMID: 33371141 PMCID: PMC7748328 DOI: 10.1097/md.0000000000023764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 11/18/2020] [Indexed: 11/26/2022] Open
Abstract
Passive leg raising (PLR) is a convenient and reliable test to predict fluid responsiveness. The ability of thoracic electrical bioimpedance cardiography (TEB) to monitor changes of cardiac output (CO) during PLR is unknown.In the present study, we measured CO in 61 patients with shock or dyspnea by TEB and transthoracic echocardiography (TTE) during PLR procedure. Positive PLR responsiveness was defined as the velocity-time integral (VTI) ≥10% after PLR. TTE measured VTI in the left ventricular output tract. The predictive value of TEB parameters in PLR responders was tested. Furthermore, the agreement of absolute CO values between TEB and TTE measurements was assessed.Among the 61 patients, there were 28 PLR-responders and 33 non-responders. Twenty-seven patients were diagnosed with shock and 34 patients with dyspnea, with 55.6% (15/27) and 54.6% (18/34) non-responders, respectively. A change in TEB measured CO (ΔCO) ≥9.8% predicted PLR responders with 75.0% sensitivity and 78.8% specificity, the area under the receiver operating characteristic curve (AUROC) was 0.79. The Δd2Z/dt2 (a secondary derivative of the impedance wave) showed the best predictive value with AUROC of 0.90, the optimal cut point was -7.1% with 85.7% sensitivity and 87.9% specificity. Bias between TEB and TTE measured CO was 0.12 L/min, and the percentage error was 65.8%.TEB parameters had promising performance in predicting PLR responders, and the Δd2Z/dt2 had the best predictive value. The CO values measured by TEB were not interchangeable with TTE in critically ill settings.
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Kaur U, Sahu S, Srivastava D, Singh TK, Mishra P, Srivastava A. To compare intraoperative goal directed fluid therapy by trans-oesophageal Doppler vis-à-vis FloTrac™ in patients undergoing living related renal transplantation-a prospective randomised controlled study. Indian J Anaesth 2020; 64:S220-S226. [PMID: 33311723 PMCID: PMC7714010 DOI: 10.4103/ija.ija_605_20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/23/2020] [Accepted: 08/26/2020] [Indexed: 12/15/2022] Open
Abstract
Background: Optimal intra-operative fluid therapy in renal transplantation (RT) is essential to ensure adequate graft function while preventing fluid overload related complications. This RCT was to compare the intraoperative goal directed fluid therapy (GDFT) based either on corrected flow time (CFT), measured by trans oesophageal Doppler (TED) or on the stroke volume variation (SVV), by FloTrac in patients undergoing living donor RT. Methods: This prospective, randomised controlled trial (RCT) was done on 60 end stage renal disease (ESRD) patients, American Society of Anaesthesiologists(ASA) grade III–IV, age 18 to 65 years of either sex, scheduled for living donor RT under general anaesthesia. They were randomly divided into two groups: TED group (n = 30) and FloTrac™ group (n = 30) and administered GDFT, based upon CFT (TED) and SVV (FloTrac™). The primary outcome was to compare the total fluid and number of fluid boluses administered intraoperatively, while the secondary outcomes were to compare any postoperative complications due to fluid overload and allograft function, assessed by serial serum creatinine levels up to 90 days postoperatively. Results: The mean total intra-operative fluid [3991.67 ± 856.32 vs. 3543.33 ± 1131.35, P = 0.089] and the amount of fluid administered per kg body weight per hour [13.32 ± 4.67 vs. 11.82 ± 4.76, P = 0.222] were lesser in the FloTrac compared to TED group, though not statistically significant. However, the postoperative incidence of allograft dysfunction, including rejection (P = 0.743) and acute tubular necrosis (ATN) (P = 0.999), and other complications (P = 0.643) were comparable. Conclusions: Both TED and FloTrac devices can be used effectively to guide GDFT in RT, However, lesser total fluid was required in the FloTrac group, which may lead to a lesser number of fluid-related postoperative complications.
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Affiliation(s)
- Ushkiran Kaur
- Department of Anaesthesiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Sandeep Sahu
- Department of Anaesthesiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Divya Srivastava
- Department of Anaesthesiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Tapas Kumar Singh
- Department of Anaesthesiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Prabhakar Mishra
- Department of Biostatistics and Health Informatics and, Uttar Pradesh, India
| | - Aneesh Srivastava
- Department of Urology and Renal Transplantation, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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Kanazawa H, Maeda T, Miyazaki E, Hotta N, Ito S, Ohnishi Y. Accuracy and Trending Ability of Blood Pressure and Cardiac Index Measured by ClearSight System in Patients With Reduced Ejection Fraction. J Cardiothorac Vasc Anesth 2020; 34:3293-3299. [DOI: 10.1053/j.jvca.2020.03.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 03/22/2020] [Accepted: 03/24/2020] [Indexed: 01/01/2023]
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Abstract
PURPOSE OF REVIEW The last decades, anesthesia has become safer, partly due to developments in monitoring. Advanced monitoring of children under anesthesia is challenging, due to lack of evidence, validity and size constraints. Most measured parameters are proxies for end organ function, in which an anesthesiologist is actually interested. Ideally, monitoring should be continuous, noninvasive and accurate. This present review summarizes the current literature on noninvasive monitoring in noncardiac pediatric anesthesia. RECENT FINDINGS For cardiac output (CO) monitoring, bolus thermodilution is still considered the gold standard. New noninvasive techniques based on bioimpedance and pulse contour analysis are promising, but require more refining in accuracy of CO values in children. Near-infrared spectroscopy is most commonly used in cardiac surgery despite there being no consensus on safety margins. Its place in noncardiac anesthesia has yet to be determined. Transcutaneous measurements of blood gases are used mainly in the neonatal intensive care unit, and is finding its way to the pediatric operation theatre. Especially CO2 measurements are accurate and useful. SUMMARY New techniques are available to assess a child's hemodynamic and respiratory status while under anesthesia. These new monitors can be used as complementary tools together with standard monitoring in children, to further improve perioperative safety.
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