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Mortara A, Rossi J, Mazzetti S, Catagnano F, Cavalotti C, Malerba G, Vecchio C, Morandi F, Nassiacos D, Oliva F. Hemodynamic effects of heart rate lowering in patients admitted for acute heart failure: the RedRate-HF Study (Reduction of heart Rate in Heart Failure). J Cardiovasc Med (Hagerstown) 2023; 24:113-122. [PMID: 36583979 DOI: 10.2459/jcm.0000000000001427] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND In patients admitted for acute heart failure (HF) indication for drugs which reduce the heart rate (HR) is debated. The multicentre prospective study Reduction of heart Rate in Heart Failure (RedRate-HF) was designed to analyse the hemodynamic effects of an early reduction of HR in acute HF. METHODS Hemodynamic parameters were recorded by using the bioimpedance technique, which was shown to be accurate, highly reproducible and sensitive to intra-observer changes. Lowering HR was obtained by ivabradine 5 mg bd, given 48-72 h after admission on the top of optimized treatment. Patients were followed at 24, 48, 72 h after drug assumption and at hospital discharge. RESULTS Twenty patients of a mean age of 67 ± 15 years, BNP at entry 1348 ± 1198 pg/ml were enrolled. Despite a clinical stabilization, after 48-72 h from admission, HR was persistently >70 bpm. Ivabradine was well tolerated in all patients with a significant increase in RR interval from 747 ± 69 ms at baseline to 948 ± 121 ms at discharge, P < 0.0001. Change in HR was associated with a significant increase in stroke volume (baseline 73 ± 22 vs. 84 ± 19 ml at discharge, P = 0.03), and reduction in left cardiac work index (baseline 3.6 ± 1.2 vs. 3.1 ± 1.1 kg/m2 at discharge, P = 0.04). Other measures of heart work were also significantly affected while cardiac output remained unchanged. CONCLUSION The strategy of an early lowering of HR in patients admitted for acute HF on top of usual care is feasible and safe. The HR reduction causes a positive increase in stroke volume and may contribute to saving energy without affecting cardiac output.
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Affiliation(s)
- Andrea Mortara
- Department of Clinical Cardiology, Policlinico di Monza, Monza
| | - Jessica Rossi
- Department of Clinical Cardiology, Policlinico di Monza, Monza
| | - Simone Mazzetti
- Department of Clinical Cardiology, Policlinico di Monza, Monza
| | - Francesco Catagnano
- Department of Clinical Cardiology, Policlinico di Monza, Monza.,Cardiology Department, University of Pavia, Pavia
| | | | - Gianluigi Malerba
- Department of Cardiovascular Science, University of Insubria, Circolo Hospital and Macchi Foundation, Varese
| | - Chiara Vecchio
- Department of Cardiology, Presidio Ospedaliero di Saronno, Saronno, Italy
| | - Fabrizio Morandi
- Department of Cardiovascular Science, University of Insubria, Circolo Hospital and Macchi Foundation, Varese
| | - Daniele Nassiacos
- Department of Cardiology, Presidio Ospedaliero di Saronno, Saronno, Italy
| | - Fabrizio Oliva
- Department of Cardiology, Niguarda Ca' Granda Hospital Milan
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Ginty AT, Tyra AT, Young DA, Brindle RC, de Rooij SR, Williams SE. Cardiovascular reactions to acute psychological stress and academic achievement. Psychophysiology 2022; 59:e14064. [PMID: 35353904 PMCID: PMC9541813 DOI: 10.1111/psyp.14064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 01/12/2022] [Accepted: 03/09/2022] [Indexed: 11/30/2022]
Abstract
Cardiovascular reactions to acute psychological stress have been associated with cognitive function. However, previous work has assessed cardiovascular reactions and cognitive function in the laboratory at the same time. The present study examined the association between cardiovascular reactions to acute psychological stress in the laboratory and academic performance in final year high school students. Heart rate, blood pressure, stroke volume, and cardiac output reactions to an acute psychological stress task were measured in 131 participants during their final year of high school. Performance on high school A‐levels were obtained the following year. Higher heart rate and cardiac output reactivity were associated with better A‐level performance. These associations were still statistically significant after adjusting for a wide range of potentially confounding variables. The present results are consistent with a body of literature suggesting that higher heart rate reactions to acute psychological stress are associated with better cognitive performance across a variety of domains. The present study is the first to examine the associations between cardiovascular reactions to stress in the laboratory and academic achievement. Additionally, it is the first to examine a more comprehensive hemodynamic profile of cardiovascular reactivity (e.g., cardiac output) with cognitive function. The present results are consistent with a body of literature suggesting that higher heart rate reactions to acute psychological stress are associated with better cognitive performance across a variety of domains.
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Affiliation(s)
- Annie T Ginty
- Department of Psychology and Neuroscience, Baylor University, Waco, Texas, USA
| | - Alexandra T Tyra
- Department of Psychology and Neuroscience, Baylor University, Waco, Texas, USA
| | - Danielle A Young
- Department of Psychology and Neuroscience, Baylor University, Waco, Texas, USA
| | - Ryan C Brindle
- Department of Cognitive and Behavioral Science & Neuroscience Program, Washington and Lee University, Lexington, Virginia, USA
| | - Susanne R de Rooij
- Department of Epidemiology and Data Science, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, Netherlands
| | - Sarah E Williams
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
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Aditianingsih D, Hidayat J, Ginting VM. Comparison of Bioimpedance Versus Pulse Contour Analysis for Intraoperative Cardiac Index Monitoring in Patients Undergoing Kidney Transplantation. Anesth Pain Med 2021; 11:e117918. [PMID: 35075410 PMCID: PMC8782196 DOI: 10.5812/aapm.117918] [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: 07/14/2021] [Revised: 09/22/2021] [Accepted: 10/04/2021] [Indexed: 11/21/2022] Open
Abstract
Background Cardiac index (CI; cardiac output indexed to body surface area) is routinely measured during kidney transplant surgery. Bioimpedance cardiometry is a transthoracic impedance as the non-invasive alternative for hemodynamic monitoring, using semi-invasive uncalibrated pulse wave or contour (UPC) analysis. Objectives We performed a cross-sectional observational study on 50 kidney transplant patients to compare the CI measurement agreement, concordance rate, and trending ability between bioimpedance and UPC analysis. Methods For each patient, CI was measured by bioimpedance analysis (ICONTM) and UPC analysis (EV1000TM) devices at three time points: after induction, during incision, and at reperfusion. The device measurement accuracy was assessed by the bias value, limit of agreement (LoA), and percentage error (PE) using Bland-Altman analyses. Trending ability was assessed by angular bias and polar concordance through four-quadrant and polar plot analyses. Results From each time point and pooled measurement, the correlation coefficients were 0.267, 0.327, 0.321, and 0.348. Bland-Altman analyses showed mean bias values of 1.18, 1.06, 1.48, and 1.30, LoA of -1.35 to 3.72, -1.39 to 3.51, -1.07 to 4.04, and -1.17 to 3.78, and PE of 82.21, 78.50, 68.74, and 74.58%, respectively. Polar plot analyses revealed angular bias values of -10.37º, -15.01º, -18.68º, and -12.62º, with radial LoA of 89.79º, 85.86º, 83.38º, and 87.82º, respectively. The four-quadrant plot concordance rates were 70.77, 67.35, 65.90, and 69.79%. These analyses showed poor agreement, weak concordance, and low trending ability of bioimpedance cardiometry to UPC analysis. Conclusions Bioimpedance and UPC analysis for CI measurements were not interchangeable in patients undergoing kidney transplant surgery. Cardiac index monitoring using bioimpedance cardiometry during kidney transplantation should be interpreted cautiously because it showed poor reliability due to low accuracy, precision, and trending ability for CI measurement.
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Affiliation(s)
- Dita Aditianingsih
- Department of Anesthesiology and Intensive Therapy, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia
- Corresponding Author: Department of Anesthesiology and Intensive Therapy, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia.
| | - Jefferson Hidayat
- Department of Anesthesiology and Intensive Therapy, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia
| | - Vivi Medina Ginting
- Department of Anesthesiology and Intensive Therapy, Faculty of Medicine, University of Indonesia, Jakarta, Indonesia
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Godoy A, Contreras A, Tabares A. Agreement analysis of stroke volume and cardiac output measurement between a oscillometric device and transthoracic echocardiogram in normotensive individuals: a preliminary report. Braz J Anesthesiol 2021:S0104-0014(21)00355-9. [PMID: 34624376 PMCID: PMC10362438 DOI: 10.1016/j.bjane.2021.09.006] [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: 11/02/2020] [Revised: 08/31/2021] [Accepted: 09/12/2021] [Indexed: 11/25/2022] Open
Abstract
INTRODUCTION The evaluation of stroke volume (SV) is useful in research and patient care. To accomplish this, an ideal device should be noninvasive, continuous, reliable, and reproducible. The Mobil-O-Graph (MOG) is a noninvasive oscillometric matrix validated for measuring aortic and peripheral blood pressure, which through conversion algorithms can estimate hemodynamic parameters. OBJECTIVES To compare the MOG measurement of stroke volume, cardiac output, and cardiac index with the transthoracic echocardiogram (TTE). METHODS Healthy volunteers aged 18 years or older were included. Two-dimensional TTEs were performed by a single operator. Subsequently, the measurement of noninvasive hemodynamics with MOG was performed with the operator blind to the results of the echocardiogram. Correlation analyses between stroke volume, cardiac output, and cardiac index parameters were performed. The degree of agreement between the methods was verified using the Bland-Altman method. RESULTS A total of 38 volunteers were enrolled with a mean age of 27.6 ± 3.8 years; 21 (55%) were male The SV by TTE was 76.8 ± 19.5 mL and 75.7 ± 19.3 mL by MOG, Rho = 0.726, p < 0.0001. The CO by TTE was 5.04 ± 0.8 mL.min-1 and 5.1 ± 0.8 mL.min-1 by MOG Rho = 0.510, p = 0.001. Bland-Altman plots showed a good concordance between the two techniques. CONCLUSIONS Our study shows that the measurement of SV and CO by noninvasive hemodynamics with the MOG device offers a good concordance with the TTE with very few values beyond the confidence limits.
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Affiliation(s)
- Alejandro Godoy
- Hospital Privado Universitario de Córdoba, Vascular Medicine and Thrombosis Service, Córdoba, Argentina.
| | - Alejandro Contreras
- Hospital Privado Universitario de Córdoba, Cardiology Service, Córdoba, Argentina; Instituto de Ciencias Biomédicas de Córdoba (IUCBC), Córdoba, Argentina
| | - Aldo Tabares
- Hospital Privado Universitario de Córdoba, Vascular Medicine and Thrombosis Service, Córdoba, Argentina; Instituto de Ciencias Biomédicas de Córdoba (IUCBC), Córdoba, Argentina
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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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Pestel G, Fukui K, Higashi M, Schmidtmann I, Werner C. [Meta-analyses on measurement precision of non-invasive hemodynamic monitoring technologies in adults]. Anaesthesist 2019; 67:409-425. [PMID: 29789877 DOI: 10.1007/s00101-018-0452-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An ideal non-invasive monitoring system should provide accurate and reproducible measurements of clinically relevant variables that enables clinicians to guide therapy accordingly. The monitor should be rapid, easy to use, readily available at the bedside, operator-independent, cost-effective and should have a minimal risk and side effect profile for patients. An example is the introduction of pulse oximetry, which has become established for non-invasive monitoring of oxygenation worldwide. A corresponding non-invasive monitoring of hemodynamics and perfusion could optimize the anesthesiological treatment to the needs in individual cases. In recent years several non-invasive technologies to monitor hemodynamics in the perioperative setting have been introduced: suprasternal Doppler ultrasound, modified windkessel function, pulse wave transit time, radial artery tonometry, thoracic bioimpedance, endotracheal bioimpedance, bioreactance, and partial CO2 rebreathing have been tested for monitoring cardiac output or stroke volume. The photoelectric finger blood volume clamp technique and respiratory variation of the plethysmography curve have been assessed for monitoring fluid responsiveness. In this manuscript meta-analyses of non-invasive monitoring technologies were performed when non-invasive monitoring technology and reference technology were comparable. The primary evaluation criterion for all studies screened was a Bland-Altman analysis. Experimental and pediatric studies were excluded, as were all studies without a non-invasive monitoring technique or studies without evaluation of cardiac output/stroke volume or fluid responsiveness. Most studies found an acceptable bias with wide limits of agreement. Thus, most non-invasive hemodynamic monitoring technologies cannot be considered to be equivalent to the respective reference method. Studies testing the impact of non-invasive hemodynamic monitoring technologies as a trend evaluation on outcome, as well as studies evaluating alternatives to the finger for capturing the raw signals for hemodynamic assessment, and, finally, studies evaluating technologies based on a flow time measurement are current topics of clinical research.
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Affiliation(s)
- G Pestel
- Klinik für Anästhesiologie, Universitätsmedizin Mainz, Langenbeckstr. 1, 55131, Mainz, Deutschland.
| | - K Fukui
- Klinik für Anästhesiologie, Universitätsmedizin Mainz, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - M Higashi
- Klinik für Anästhesiologie, Universitätsmedizin Mainz, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - I Schmidtmann
- Institut für Medizinische Biometrie, Epidemiologie und Informatik (IMBEI), Universitätsmedizin Mainz, Mainz, Deutschland
| | - C Werner
- Klinik für Anästhesiologie, Universitätsmedizin Mainz, Langenbeckstr. 1, 55131, Mainz, Deutschland
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Kim GE, Kim SY, Kim SJ, Yun SY, Jung HH, Kang YS, Koo BN. Accuracy and Efficacy of Impedance Cardiography as a Non-Invasive Cardiac Function Monitor. Yonsei Med J 2019; 60:735-741. [PMID: 31347328 PMCID: PMC6660442 DOI: 10.3349/ymj.2019.60.8.735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 05/09/2019] [Accepted: 06/16/2019] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The most common method of monitoring cardiac output (CO) is thermodilution using pulmonary artery catheter (PAC), but this method is associated with complications. Impedance cardiography (ICG) is a non-invasive CO monitoring technique. This study compared the accuracy and efficacy of ICG as a non-invasive cardiac function monitoring technique to those of thermodilution and arterial pressure contour. MATERIALS AND METHODS Sixteen patients undergoing liver transplantation were included. Cardiac index (CI) was measured by thermodilution using PAC, arterial waveform analysis, and ICG simultaneously in each patient. Statistical analysis was performed using intraclass correlation coefficient (ICC) and Bland-Altman analysis to assess the degree of agreement. RESULTS The difference by thermodilution and ICG was 1.13 L/min/m², and the limits of agreement were -0.93 and 3.20 L/min/m². The difference by thermodilution and arterial pressure contour was 0.62 L/min/m², and the limits of agreement were -1.43 and 2.67 L/min/m². The difference by arterial pressure contour and ICG was 0.50 L/min/m², and the limits of agreement were -1.32 and 2.32 L/min/m². All three percentage errors exceeded the 30% limit of acceptance. Substantial agreement was observed between CI of thermodilution with PAC and ICG at preanhepatic and anhepatic phases, as well as between CI of thermodilution and arterial waveform analysis at preanhepatic phase. Others showed moderate agreement. CONCLUSION Although neither method was clinically equivalent to thermodilution, ICG showed more substantial correlation with thermodilution method than with arterial waveform analysis. As a non-invasive cardiac function monitor, ICG would likely require further studies in other settings.
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Affiliation(s)
- Go Eun Kim
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - So Yeon Kim
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Seon Ju Kim
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Soon Young Yun
- Department of Anesthesiology and Pain Medicine, Gachon University Gil Medical Center, Incheon, Korea
| | - Hwan Ho Jung
- Department of Anesthesiology and Pain Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Yhen Seung Kang
- Department of Anesthesiology and Pain Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Bon Nyeo Koo
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.
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Harford M, Clark SH, Smythe JF, Gerry S, Villarroel M, Jorge J, Chaichulee S, Tarassenko L, Young D, Watkinson P. Non-invasive stroke volume estimation by transthoracic electrical bioimpedance versus Doppler echocardiography in healthy volunteers. J Med Eng Technol 2019; 43:33-37. [PMID: 30983444 PMCID: PMC6550124 DOI: 10.1080/03091902.2019.1599074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Thoracic electrical bioimpedance (TEB) and transthoracic echocardiography (TTE) are non-invasive methods to estimate stroke volume (SV) and cardiac output (CO). Thoracic electrical bioimpedance is not in widespread clinical use with reports of inaccurate cardiac output estimation compared to invasive monitors, particularly in non-healthy populations. We explore its use as a trend monitor by comparing it against thoracic echocardiography in fifteen healthy volunteers undergoing two physical challenges designed to vary cardiac output. Of all paired values, 54.6% showed gross trend agreement and only 1.9% showed direct disagreement between the two monitors. Our results show thoracic bioimpedance may have a role as a non-invasive cardiac output trend monitor in healthy volunteer studies.
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Affiliation(s)
- Mirae Harford
- a Critical Care Research Group, Nuffield Department of Clinical Neurosciences , University of Oxford , Oxford , UK.,b Department of Engineering Science, Institute of Biomedical Engineering , University of Oxford , Oxford , UK
| | - Samuel H Clark
- c Critical Care Department , University College London Hospitals NHS Foundation Trust , London , UK
| | - Jodie F Smythe
- d Adult Intensive Care Unit , John Radcliffe Hospital, Oxford University Hospitals NHS Foundation Trust , Oxford , UK
| | - Stephen Gerry
- e Centre for Statistics in Medicine , University of Oxford , Oxford , UK
| | - Mauricio Villarroel
- b Department of Engineering Science, Institute of Biomedical Engineering , University of Oxford , Oxford , UK
| | - Joao Jorge
- b Department of Engineering Science, Institute of Biomedical Engineering , University of Oxford , Oxford , UK
| | - Sitthichok Chaichulee
- b Department of Engineering Science, Institute of Biomedical Engineering , University of Oxford , Oxford , UK
| | - Lionel Tarassenko
- b Department of Engineering Science, Institute of Biomedical Engineering , University of Oxford , Oxford , UK
| | - Duncan Young
- a Critical Care Research Group, Nuffield Department of Clinical Neurosciences , University of Oxford , Oxford , UK
| | - Peter Watkinson
- a Critical Care Research Group, Nuffield Department of Clinical Neurosciences , University of Oxford , Oxford , UK
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Suparschi V, Le Bihan E, Toussaint A, Saptefrat D, Ben Abdallah H, Gloulou F, Aouati F, Gauss T, Paugam-Burtz C. Noninvasive assessment of Cardiac Index using impedance cardiography during liver transplantation surgery: a comparison with pulmonary artery thermodilution. Minerva Anestesiol 2018; 85:28-33. [PMID: 29745622 DOI: 10.23736/s0375-9393.18.12391-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Liver transplantation (LT) is a high-risk surgery associated with significant hemodynamic changes requiring advanced hemodynamic monitoring. Pulmonary Artery Catheter (PAC) is still considered as a gold-standard for Cardiac Index (CI) measurement during LT despite association with an increased risk of complications. Noninvasive impedance cardiography (ICG) could be an interesting alternative tool for CI monitoring. The aim of this study was to compare the precision and trending ability of ICG versus PAC methods during LT. METHODS Patients undergoing LT were prospectively included. CI was measured with PAC and ICG at 4 time points (T1: before surgical incision, T2: during anhepatic phase, T3: after portal reperfusion, T4: during wound closure). Bias and percentage error (PE) between CI measured with PAC and ICG were analyzed with the Bland-Altman method for repeated measurements. Trending ability was studied with 4-quadrant and polar plots and correlation coefficient. RESULTS We included 43 patients with 156 measures. Mean bias was -0.95 L.min-1.m-2, SD±1.07, limits of agreement -3.73 to 1.83 L.min-1.m-2 and PE 58%. There was a significant increase in bias during LT (P<0.001). Assessment of trending ability displayed a concordance rate of 72% on the 4-quadrant plot and a mean angular bias of -8.4° (SD±28°) and radial limits of agreement ±55° on the polar plot. CONCLUSIONS CI measurements using ICG exhibited a low precision and a poor trending ability when compared to thermodilution method during LT. Consequently, ICG is not an adequate hemodynamic tool to monitor CI during LT.
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Affiliation(s)
- Vlad Suparschi
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France -
| | - Eric Le Bihan
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Amélie Toussaint
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Diana Saptefrat
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Heykel Ben Abdallah
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Faouzi Gloulou
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Farida Aouati
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Tobias Gauss
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France
| | - Catherine Paugam-Burtz
- Department of Anesthesia and Critical Care, Beaujon Hospital, Paris Nord-Val de Seine University Hospitals, Clichy, France.,Denis Diderot University, PRES Sorbonne Paris Cité, Paris, France.,Inserm UMR-S1149, Center for Research on Inflammation, Paris, France
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Perioperative Cardiac Output Monitoring Utilizing Non-pulse Contour Methods. CURRENT ANESTHESIOLOGY REPORTS 2017. [DOI: 10.1007/s40140-017-0240-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nazário Leão R, Silva PMD, Pocinho RM, Alves M, Virella D, Palma Reis R. Good agreement between echocardiography and impedance cardiography in the assessment of left ventricular performance in hypertensive patients. Clin Exp Hypertens 2017; 40:461-467. [PMID: 29172784 DOI: 10.1080/10641963.2017.1392558] [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: 10/18/2022]
Abstract
BACKGROUND Impedance cardiography (ICG) is a noninvasive hemodynamic monitoring tool which can define hypertensive patients' hemodynamic profiles and help to tailor antihypertensive therapy. This study assesses the concordance between ICG-derived indexes used to evaluate left ventricular performance and transthoracic echocardiography (TTE) in hypertensive patients. METHODS In this IMPEDDANS post-hoc analysis, the ICG-derived indexes are compared with TTE by Bland-Altman method. Statistical significance of the relationship between the values obtained was assessed by generalized linear mixed-effects models. RESULTS In supine position, Bland-Altman analysis showed good concordance for cardiac output (CO) (mean difference of 0.006 mL/min [-0.120; 0.133]), cardiac index (CI) (mean difference of 0.016 mL/min/m2 [-0.471; 0.504]), pre-ejection period (PEP) (mean difference of -0.216 ms [-4.510; 4.077]), left ventricular ejection time (LVET) (mean difference of -0.140 ms [-6.573; 6.293]), and systolic time ratio (STR) (mean difference of -0.00004 [-0.008; 0.008]). In orthostatic position, good concordance was found for CO (mean difference 0.028 mL/min [-2.036; 1.980]), CI (mean difference -0.012 mL/min/m2 [-1.063; 1.039]), and STR (mean difference -0.101 [0.296; 0.094]). No significant difference between methods was identified by the linear mixed-effects models. CONCLUSION The ICG-derived indexes CO, CI, PEP, LVET, and STR in supine position have good agreement with TTE. Therefore, ICG can be used to accurately evaluate left ventricular performance.
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Affiliation(s)
- Rodrigo Nazário Leão
- a Unidade Funcional Medicina 2, Hospital São José, Centro Hospitalar Lisboa Central-EPE , Lisboa , Portugal.,b NOVA Medical School, Universidade NOVA de Lisboa , Lisboa , Portugal
| | - Pedro Marques Da Silva
- b NOVA Medical School, Universidade NOVA de Lisboa , Lisboa , Portugal.,c Núcleo de Investigação Arterial, Unidade Funcional Medicina 4, Hospital Santa Marta, Centro Hospitalar Lisboa Central-EPE , Lisboa , Portugal
| | - Rita Marques Pocinho
- a Unidade Funcional Medicina 2, Hospital São José, Centro Hospitalar Lisboa Central-EPE , Lisboa , Portugal
| | - Marta Alves
- d Gabinete de Análise Epidemiológica e Estatística, Centro de Investigação, Centro Hospitalar de Lisboa Central-EPE , Lisboa , Portugal
| | - Daniel Virella
- f Gabinete de Análise Epidemiológica e Estatística, Centro de Investigação, Centro Hospitalar Lisboa Central-EPE , Lisboa , Portugal
| | - Roberto Palma Reis
- b NOVA Medical School, Universidade NOVA de Lisboa , Lisboa , Portugal.,e Unidade de Cardiologia, Hospital Pulido Valente, Centro Hospitalar Lisboa Norte-EPE , Lisboa , Portugal
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Beat-to-beat estimation of stroke volume using impedance cardiography and artificial neural network. Med Biol Eng Comput 2017; 56:1077-1089. [DOI: 10.1007/s11517-017-1752-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Accepted: 11/03/2017] [Indexed: 10/18/2022]
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Nederend I, Ten Harkel ADJ, Blom NA, Berntson GG, de Geus EJC. Impedance cardiography in healthy children and children with congenital heart disease: Improving stroke volume assessment. Int J Psychophysiol 2017; 120:136-147. [PMID: 28778397 DOI: 10.1016/j.ijpsycho.2017.07.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 07/20/2017] [Accepted: 07/29/2017] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Stroke volume (SV) and cardiac output are important measures in the clinical evaluation of cardiac patients and are also frequently used in research applications. This study was aimed to improve SV scoring derived from spot-electrode based impedance cardiography (ICG) in a pediatric population of healthy volunteers and patients with a corrected congenital heart defect. METHODS 128 healthy volunteers and 66 patients participated. First, scoring methods for ambiguous ICG signals were optimized to improve agreement of B- and X-points with aortic valve opening/closure in simultaneously recorded transthoracic echocardiography (TTE). Building on the improved scoring of B- and X-points, the Kubicek equation for SV estimation was optimized by testing the agreement with the simultaneously recorded SV by TTE. Both steps were initially done in a subset of the sample of healthy children and then validated in the remaining subset of healthy children and in a sample of patients. RESULTS SV assessment by ICG in healthy children strongly improved (intra class correlation increased from 0.26 to 0.72) after replacing baseline thorax impedance (Z0) in the Kubicek equation by an equation (7.337-6.208∗dZ/dtmax), where dZ/dtmax is the amplitude of the ICG signal at the C-point. Reliable SV assessment remained more difficult in patients compared to healthy controls. CONCLUSIONS After proper adjustment of the Kubicek equation, SV assessed by the use of spot-electrode based ICG is comparable to that obtained from TTE. This approach is highly feasible in a pediatric population and can be used in an ambulatory setting.
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Affiliation(s)
- Ineke Nederend
- Vrije Universiteit Amsterdam, Amsterdam Public Health Research Institute, Department of Biological Psychology, Faculty of Behavioral and Movement Sciences, Van der Boechorststraat 1, 1081 BT Amsterdam, The Netherlands; Department of Pediatric Cardiology, LUMC University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands.
| | - Arend D J Ten Harkel
- Department of Pediatric Cardiology, LUMC University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands.
| | - Nico A Blom
- Department of Pediatric Cardiology, LUMC University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands.
| | - Gary G Berntson
- Ohio State University, Department of Psychology, 1835 Neil Avenue, Columbus OH 43210, United States.
| | - Eco J C de Geus
- Vrije Universiteit Amsterdam, Amsterdam Public Health Research Institute, Department of Biological Psychology, Faculty of Behavioral and Movement Sciences, Van der Boechorststraat 1, 1081 BT Amsterdam, The Netherlands.
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Helen L, O'Donnell BD, Moore E. Nerve localization techniques for peripheral nerve block and possible future directions. Acta Anaesthesiol Scand 2015; 59:962-74. [PMID: 25997933 DOI: 10.1111/aas.12544] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 03/24/2015] [Accepted: 04/05/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Ultrasound guidance is now a standard nerve localization technique for peripheral nerve block (PNB). Ultrasonography allows simultaneous visualization of the target nerve, needle, local anesthetic injectate, and surrounding anatomical structures. Accurate deposition of local anesthetic next to the nerve is essential to the success of the nerve block procedure. Due to limitations in the visibility of both needle tip and nerve surface, the precise relationship between needle tip and target nerve is unknown at the moment of injection. Importantly, nerve injury may result both from an inappropriately placed needle tip and inappropriately placed local anesthetic. The relationship between the block needle tip and target nerve is of paramount importance to the safe conduct of peripheral nerve block. METHODS This review summarizes the evolution of nerve localization in regional anesthesia, characterizes a problem faced by clinicians in performing ultrasound-guided nerve block, and explores the potential technological solutions to this problem. RESULTS To date, technology newly applied to PNB includes real-time 3D imaging, multi-planar magnetic needle guidance, and in-line injection pressure monitoring. This review postulates that optical reflectance spectroscopy and bioimpedance may allow for accurate identification of the relationship between needle tip and target nerve, currently a high priority deficit in PNB techniques. CONCLUSIONS Until it is known how best to define the relationship between needle and nerve at the moment of injection, some common sense principles are suggested.
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Affiliation(s)
- L. Helen
- Sensing and Separation Group; Chemistry Department and Life Science Interface Group; Tyndall National Institute; University College Cork; Cork Ireland
| | - B. D. O'Donnell
- Department of Anesthesia; Cork University Hospital & ASSERT for Health Centre; University College Cork; Cork Ireland
| | - E. Moore
- Sensing and Separation Group; Chemistry Department and Life Science Interface Group; Tyndall National Institute; University College Cork; Cork Ireland
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Ginty AT, Brindle RC, Carroll D. Cardiac stress reactions and perseverance: Diminished reactivity is associated with study non-completion. Biol Psychol 2015; 109:200-5. [DOI: 10.1016/j.biopsycho.2015.06.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 05/28/2015] [Accepted: 06/01/2015] [Indexed: 12/30/2022]
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McIntyre JPR, Ellyett KM, Mitchell EA, Quill GM, Thompson JM, Stewart AW, Doughty RN, Stone PR. Validation of thoracic impedance cardiography by echocardiography in healthy late pregnancy. BMC Pregnancy Childbirth 2015; 15:70. [PMID: 25886289 PMCID: PMC4389339 DOI: 10.1186/s12884-015-0504-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 03/17/2015] [Indexed: 11/10/2022] Open
Abstract
Background Assessment of stroke volume (SV) is often necessary in clinical and research settings. The clinically established method for SV assessment in pregnancy is echocardiography, but given its limitations, it is not always an appropriate measurement tool. Thoracic impedance cardiography (ICG) allows continuous, non-invasive SV assessment. However, SV determination relies on assumptions regarding the thoracic shape that may mean the algorithm is not valid in pregnancy. The available data regarding the validity of ICG against an established reference standard using modern SV algorithms are both limited and conflicting. We aimed to test the validity of ICG in a clinically realistic setting in late pregnancy using echocardiography. Methods Twenty-nine women in late pregnancy underwent standard echocardiography assessments with simultaneous ICG measurement. Agreement between devices was tested using Bland-Altman analysis. Results Bland-Altman analysis of the relationship between ICG and echocardiography demonstrated that the 95% limits of agreement exceeded acceptable or expected ranges. Measures of maternal and fetal anthropometry do not account for the lack of agreement. Conclusions Absolute values of SV as determined by ICG are not valid in pregnancy. Further work is required to examine the ability of ICG to assess relative changes in maternal haemodynamics in late pregnancy.
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Affiliation(s)
- Jordan P R McIntyre
- Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Level 12, Support Building, Auckland City Hospital, Private Bag 92019, Auckland, New Zealand. .,New Zealand Respiratory and Sleep Institute, Auckland, New Zealand.
| | - Kevin M Ellyett
- Respiratory Measurement Laboratory, Auckland District Health Board, Auckland, New Zealand.
| | - Edwin A Mitchell
- Department of Paediatrics, University of Auckland, Auckland, New Zealand.
| | - Gina M Quill
- Department of Medicine, University of Auckland, Auckland, New Zealand.
| | - John Md Thompson
- Department of Paediatrics, University of Auckland, Auckland, New Zealand.
| | - Alistair W Stewart
- Department of Epidemiology and Biostatistics, School of Population Health, University of Auckland, Auckland, New Zealand.
| | - Robert N Doughty
- Department of Medicine, University of Auckland, Auckland, New Zealand.
| | - Peter R Stone
- Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Level 12, Support Building, Auckland City Hospital, Private Bag 92019, Auckland, New Zealand.
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Vergnaud E, Vidal C, Verchère J, Miatello J, Meyer P, Carli P, Orliaguet G. Stroke volume variation and indexed stroke volume measured using bioreactance predict fluid responsiveness in postoperative children. Br J Anaesth 2014; 114:103-9. [PMID: 25315146 DOI: 10.1093/bja/aeu361] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Postoperative fluid management can be challenging in children after haemorrhagic surgery. The goal of this study was to assess the ability of dynamic cardiovascular variables measured using bioreactance (NICOM®, Cheetah Medical, Tel Aviv, Israel) to predict fluid responsiveness in postoperative children. METHODS Children sedated and mechanically ventilated, who require volume expansion (VE) during the immediate postoperative period, were included. Indexed stroke volume (SVi), cardiac index, and stroke volume variation (SVV) were measured using the NICOM® device. Responders (Rs) to VE were patients showing an increase in SV measured using transthoracic echocardiography of at least 15% after VE. Data are median [95% confidence interval (CI)]. RESULTS Thirty-one patients were included, but one patient was excluded because of the lack of calibration of the NICOM® device. Before VE, SVi [33 (95% CI 31-36) vs 24 (95% CI 21-28) ml m(-2); P=0.006] and SVV [8 (95% CI 4-11) vs 13 (95% CI 11-15)%; P=0.004] were significantly different between non-responders and Rs. The areas under the receiver operating characteristic curves of SVi and SVV for predicting fluid responsiveness were 0.88 (95% CI 0.71-0.97) and 0.81 (95% CI 0.66-0.96), for a cut-off value of 29 ml m(-2) (grey zone 27-29 ml m(-2)) and 10% (grey zone 9-15%), respectively. CONCLUSIONS The results of this study show that SVi and SVV non-invasively measured by bioreactance are predictive of fluid responsiveness in sedated and mechanically ventilated children after surgery.
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Affiliation(s)
- E Vergnaud
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
| | - C Vidal
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
| | - J Verchère
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
| | - J Miatello
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
| | - P Meyer
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
| | - P Carli
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
| | - G Orliaguet
- Service d'Anesthésie Réanimation, Hôpital Universitaire Necker-Enfants Malades, Université Paris Descartes, Assistance Publique Hôpitaux de Paris, 149 rue de Sevres, 75743 Paris Cedex 15, France
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Fellahi JL, Fischer MO. Electrical Bioimpedance Cardiography: An Old Technology With New Hopes for the Future. J Cardiothorac Vasc Anesth 2014; 28:755-60. [DOI: 10.1053/j.jvca.2013.12.026] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Indexed: 11/11/2022]
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Lorne E, Mahjoub Y, Diouf M, Sleghem J, Buchalet C, Guinot PG, Petiot S, Kessavane A, Dehedin B, Dupont H. Accuracy of impedance cardiography for evaluating trends in cardiac output: a comparison with oesophageal Doppler. Br J Anaesth 2014; 113:596-602. [PMID: 24871872 DOI: 10.1093/bja/aeu136] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Impedance cardiography (ICG) enables continuous, beat-by-beat, non-invasive, operator-independent, and inexpensive cardiac output (CO) monitoring. We compared CO values and variations obtained by ICG (Niccomo™, Medis) and oesophageal Doppler monitoring (ODM) (CardioQ™, Deltex Medical) in surgical patients. METHODS This prospective, observational, single-centre study included 32 subjects undergoing surgery with general anaesthesia. CO was measured simultaneously with ICG and ODM before and after events likely to modify CO (vasopressor administration and volume expansion). One hundred and twenty pairs of CO measurements and 94 pairs of CO variation measurements were recorded. RESULTS The CO variations measured by ICG correlated with those measured by ODM [r=0.88 (0.82-0.94), P<0.001]. Trending ability was good for a four-quadrant plot analysis with exclusion of the central zone (<10%) [95% confidence interval (CI) for concordance (0.86; 1.00)]. Moderate to good trending ability was observed with a polar plot analysis (angular bias: -7.2°; 95% CI -12.3°; -2.5°; with radial limits of agreement -38°; 24°). After excluding subjects with chronic obstructive pulmonary disease, a Bland-Altman plot showed a mean bias of 0.47 litre min(-1), limits of agreements between -1.24 and 2.11 litre min(-1), and a percentage error of 35%. CONCLUSION ICG appears to be a reliable method for the non-invasive monitoring of CO in patients undergoing general surgery.
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Affiliation(s)
- E Lorne
- Department of Anesthesiology and Critical Care Medicine and INSERM U1088, Jules Verne University of Picardy, Amiens, France
| | - Y Mahjoub
- Department of Anesthesiology and Critical Care Medicine and INSERM U1088, Jules Verne University of Picardy, Amiens, France
| | - M Diouf
- Biostatistics Department, Amiens University Medical Center, Amiens, France
| | - J Sleghem
- Department of Anesthesiology and Critical Care Medicine and
| | - C Buchalet
- Department of Anesthesiology and Critical Care Medicine and
| | - P-G Guinot
- Department of Anesthesiology and Critical Care Medicine and
| | - S Petiot
- Department of Anesthesiology and Critical Care Medicine and
| | - A Kessavane
- Department of Anesthesiology and Critical Care Medicine and
| | - B Dehedin
- Department of Anesthesiology and Critical Care Medicine and
| | - H Dupont
- Department of Anesthesiology and Critical Care Medicine and INSERM U1088, Jules Verne University of Picardy, Amiens, France
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Staelens A, Tomsin K, Grieten L, Oben J, Mesens T, Spaanderman M, Jacquemyn Y, Gyselaers W. Non-invasive assessment of gestational hemodynamics: benefits and limitations of impedance cardiography versus other techniques. Expert Rev Med Devices 2014; 10:765-79. [DOI: 10.1586/17434440.2013.853466] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Fontecave-Jallon J, Videlier B, Baconnier P, Tanguy S, Calabrese P, Guméry PY. Detecting variations of blood volume shift due to heart beat from respiratory inductive plethysmography measurements in man. Physiol Meas 2013; 34:1085-101. [PMID: 23954865 DOI: 10.1088/0967-3334/34/9/1085] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The simultaneous study of the cardiac and respiratory activities and their interactions is of great physiological and clinical interest. For this purpose, we want to investigate if respiratory inductive plethysmography (RIP) can be used for cardiac functional exploration. We propose a system, based on RIP technology and time-scale approaches of signal processing, for the extraction of cardiac information. This study focuses on the monitoring of blood volume shift due to heart beat, noted ▵Vtr_c and investigates RIP for the detection of ▵Vtr_c variations by comparison to stroke volume (SV) variations estimated by impedance cardiography (IMP). We proposed a specific respiratory protocol assumed to induce significant variations of the SV. Fifteen healthy volunteers in the seated and supine positions were asked to alternate rest respiration and maneuvers, consisting in blowing into a manometer. A multi-step treatment including a variant of empirical mode decomposition was applied on RIP signals to extract cardiac volume signals and estimate beat-to-beat ▵Vtr_c. These were averaged in quasi-stationary states at rest and during the respiratory maneuvers, and analysed in view of SV estimations from IMP signals simultaneously acquired. Correlation and statistical tests over the data show that RIP can be used to detect variations of the cardiac blood shift in healthy young subjects.
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Affiliation(s)
- J Fontecave-Jallon
- University Joseph Fourier-Grenoble 1, CNRS, TIMC-IMAG Laboratory CNRS UMR 5525, PRETA team, Grenoble, F-38041, France.
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Kim JY, Kim BR, Lee KH, Kim KW, Kim JH, Lee SI, Kim KT, Choe WJ, Park JS, Kim JW. Comparison of cardiac output derived from FloTrac™/Vigileo™ and impedance cardiography during major abdominal surgery. J Int Med Res 2013; 41:1342-9. [DOI: 10.1177/0300060513487649] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objectives Impedance cardiography (ICG) is a noninvasive technique that provides reasonably accurate measurements of cardiac output, but the usefulness of ICG in patients undergoing open abdominal surgery has not been validated. Methods Cardiac output was measured while patients underwent open gastrectomy using an ICG monitor ( niccomo™; ICG-CO); the results were compared with those measured using a FloTrac™/Vigileo™ monitor (Flo-CO), which measures cardiac output by analysing the arterial waveform. Data collection commenced at the beginning of anaesthetic induction and continued until the patient was awake. Data were compared using the Bland–Altman analysis, and the clinical significance of the difference between the two methods was evaluated by calculating the percentage error (%). Results Eleven patients were monitored during surgery. The bias of the Flo-CO and ICG-CO values was −0.45 l/min. The upper and lower limits of agreement were 0.96 l/min and −1.85 l/min, respectively. The percentage error was 28.5%. Electrocautery induced interference that transiently impaired the performance of the ICG monitor. Conclusions ICG provided useful information in evaluating the cardiac output of patients during abdominal surgery.
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Affiliation(s)
- Ji-Yeon Kim
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Bo-Ram Kim
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Kang-Hun Lee
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Kyung-Woo Kim
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Jun-Hyun Kim
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Sang-Il Lee
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Kyung-Tae Kim
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Won-Joo Choe
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Jang-Su Park
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
| | - Jung-Won Kim
- Department of Anaesthesiology and Pain Medicine, Ilsan Paik Hospital, Inje University, Goyang, Republic of Korea
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Kaszuba E, Scheel S, Odeberg H, Halling A. Comparing impedance cardiography and echocardiography in the assessment of reduced left ventricular systolic function. BMC Res Notes 2013; 6:114. [PMID: 23531417 PMCID: PMC3618318 DOI: 10.1186/1756-0500-6-114] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 03/06/2013] [Indexed: 01/22/2023] Open
Abstract
Background An early and accurate diagnosis of chronic heart failure is a big challenge for a general practitioner. Assessment of left ventricular function is essential for the diagnosis of heart failure and the prognosis. A gold standard for identifying left ventricular function is echocardiography. Echocardiography requires input from specialized care and has a limited access in Swedish primary health care. Impedance cardiography (ICG) is a noninvasive and low-cost method of examination. The survey technique is simple and ICG measurement can be performed by a general practitioner. ICG has been suggested for assessment of left ventricular function in patients with heart failure. We aimed to study the association between hemodynamic parameters measured by ICG and the value of ejection fraction as a determinant of reduced left ventricular systolic function in echocardiography. Methods A non-interventional, observational study conducted in the outpatients heart failure unit. Thirty-six patients with the diagnosis of chronic heart failure were simultaneously examined by echocardiography and ICG. Distribution of categorical variables was presented as numbers. Distribution of continuous variables was presented as a mean and 95% Confidence Interval. Kruskal-Wallis test was used to compare variables and show differences between the groups. A p-value of <0.05 was considered significant. Results We found that three ICG parameters: pre-ejection fraction, left ventricular ejection time and systolic time ratio were significantly associated with ejection fraction measured by echocardiography. Conclusions The association which we found between EF and ICG parameters was not reported in previous studies. We found no association between EF and ICG parameters which were suggested previously as the determinants of reduced left ventricular systolic function. The knowledge concerning explanation of hemodynamic parameters measured by ICG that is available nowadays is not sufficient to adopt the method in practice and use it to describe left ventricular systolic dysfunction.
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Affiliation(s)
- Elzbieta Kaszuba
- Blekinge Competence Centre, Wämö Centre, Karlskrona SE-371 81, Sweden.
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Ginty AT, Gianaros PJ, Derbyshire SWG, Phillips AC, Carroll D. Blunted cardiac stress reactivity relates to neural hypoactivation. Psychophysiology 2013; 50:219-29. [DOI: 10.1111/psyp.12017] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 11/15/2012] [Indexed: 12/30/2022]
Affiliation(s)
- Annie T. Ginty
- School of Sport and Exercise Sciences; University of Birmingham; Birmingham; UK
| | - Peter J. Gianaros
- Department of Psychology; University of Pittsburgh; Pittsburgh; Pennsylvania; USA
| | | | - Anna C. Phillips
- School of Sport and Exercise Sciences; University of Birmingham; Birmingham; UK
| | - Douglas Carroll
- School of Sport and Exercise Sciences; University of Birmingham; Birmingham; UK
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Hemodynamic changes in the brachial artery induced by acupuncture stimulation on the lower limbs: a single-blind randomized controlled trial. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2012:958145. [PMID: 23304231 PMCID: PMC3525317 DOI: 10.1155/2012/958145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Revised: 10/16/2012] [Accepted: 10/30/2012] [Indexed: 01/22/2023]
Abstract
Acupuncture is commonly performed at acupoints. No comparisons of quantitative physiological alterations in the brachial artery (BA) induced by the stimulation of different acupoints in the lower limbs have been performed in humans. Therefore, we investigated changes in blood flow volume (BFV) in the BA as an indicator of the physiological effects induced by stimulation at 3 points. Seventy-five healthy participants aged 33 ± 9 years (mean ± SD) were enrolled and randomly assigned to 3 groups; they received stimulation at 3 different points located on the lower limbs: ST36, LR3, and a non-acupoint. Stimulation was performed bilaterally with manual rotation of the needles. Using ultrasonography, BFV was measured continuously from rest to 180 seconds after stimulation. LR3 stimulation significantly increased BFV compared to that before needle insertion. Meanwhile, stimulation at ST36 and the non-acupoint significantly decreased BFV compared to that before needle insertion. Stimulation at LR3 elicited a significant increase in BFV compared to that at ST36 and the non-acupoint. The results suggest that the stimulation of different points on the lower limbs causes distinct physiological effects on BFV in the BA.
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Cardiac parameters in children recovered from acute illness as measured by electrical cardiometry and comparisons to the literature. J Clin Monit Comput 2012; 27:81-91. [PMID: 23054385 DOI: 10.1007/s10877-012-9401-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Accepted: 09/26/2012] [Indexed: 12/30/2022]
Abstract
Electrical cardiometry (EC) is a non-invasive cardiac output method that can assess cardiac index (CI) and stroke index (SI) but there are no reference values for children per se. The primary aim of this study was to develop reference values for clinical application. The secondary aim was to compare the EC measurements to published values. We performed a prospective observational study in patients (<21 years of age) without structural heart disease who had recovered from an acute illness. EC recordings in children that had normal heart rate and mean arterial blood pressure at discharge were eligible for analysis. The relationship of CI or SI and age in children was performed by regression analysis. Similar analysis was performed comparing measurements by EC to cardiac parameters values compiled from reference sources to assess bias in EC. Eighty-three children (2 weeks-21 years of age) were studied. There was a significant curvilinear relationship between CI or SI and age by EC (F-test, p < 0.05). Regression curves of cardiac parameters reported in the literature using 6 Fick's method, thermodilution, echocardiography and cardiac MRI were the same or higher than (0-19.6 %) values obtained with EC, with higher values being statistically significant (p < 0.05 all). There is a curvilinear relationship of CI or SI and age by EC in normal children. Cardiac parameters reported in the literature using alternative methods are different from those obtained with EC but are within acceptable ranges, with EC biased to underestimate CI. Adjustment of target value is required for EC goal-directed therapies.
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McBride WT, Ranaldi G, Dougherty MJ, Siciliano T, Trethowan B, Elliott P, Rice C, Scolletta S, Giomarelli P, Romano SM, Linton DM. The Hemodynamic and Respiratory Effects of Cuirass Ventilation in Healthy Volunteers: Part 1. J Cardiothorac Vasc Anesth 2012; 26:868-72. [DOI: 10.1053/j.jvca.2012.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Indexed: 11/11/2022]
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Fellahi JL, Fischer MO, Dalbera A, Massetti M, Gérard JL, Hanouz JL. Can endotracheal bioimpedance cardiography assess hemodynamic response to passive leg raising following cardiac surgery? Ann Intensive Care 2012; 2:26. [PMID: 22784815 PMCID: PMC3425133 DOI: 10.1186/2110-5820-2-26] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 07/11/2012] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The utility of endotracheal bioimpedance cardiography (ECOM) has been scarcely reported. We tested the hypothesis that it could be an alternative to pulse contour analysis for cardiac index measurement and prediction in fluid responsiveness. METHODS Twenty-five consecutive adult patients admitted to the intensive care unit following conventional cardiac surgery were prospectively included and investigated at baseline, during passive leg raising, and after fluid challenge. Comparative cardiac index data points were collected from pulse contour analysis (CIPC) and ECOM (CIECOM). Correlations were determined by linear regression. Bland-Altman analysis was used to compare the bias, precision, and limits of agreement. Percentage error was calculated. Changes in CIPC (ΔCIPC) and CIECOM (ΔCIECOM) during passive leg raising were collected to assess their discrimination in predicting fluid responsiveness. RESULTS A significant relationship was found between CIPC and CIECOM (r = 0.45; P < 0.001). Bias, precision, and limits of agreement were 0.44 L.min-1.m-2 (95% confidence interval, 0.33-0.56), 0.59 L.min-1.m-2, and -0.73 to 1.62 L.min-1.m-2, respectively. Percentage error was 45%. A significant relationship was found between percent changes in CIPC and CIECOM after fluid challenge (r = 0.42; P = 0.035). Areas under the ROC curves for ΔCIPC and ΔCIECOM to predict fluid responsiveness were 0.72 (95% confidence interval, 0.5-0.88) and 0.81 (95% confidence interval, 0.61-0.94), respectively. CONCLUSIONS ECOM is not interchangeable with pulse contour analysis but seems consistent to monitor cardiac index continuously and could help to predict fluid responsiveness by using passive leg raising.
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Affiliation(s)
- Jean-Luc Fellahi
- Department of Anesthesiology and Critical Care Medicine, CHU de Caen, Caen, F-14000, France.
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Haemodynamic changes in the superior mesenteric artery induced by acupuncture stimulation on the lower limbs. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2012; 2012:908546. [PMID: 22675391 PMCID: PMC3366235 DOI: 10.1155/2012/908546] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 02/09/2012] [Accepted: 03/19/2012] [Indexed: 11/18/2022]
Abstract
Acupuncture is commonly performed on acupoints. A comparison of quantitative physiological alterations induced by stimulation on different acupoints has never been performed in the superior mesenteric artery (SMA) in humans. Therefore, we investigated changes in blood flow volume (BFV) in the SMA as an indicator of physiological effects induced by stimulation on 3 points. Thirty healthy participants aged 29 ± 10 years (mean ± SD) were enrolled. All participants underwent stimulations on 3 points located in the lower legs: ST36, LR3, and a non-acupoint. Control pertains to a condition with no-stimulation. Stimulation was performed bilaterally with manual rotation of the needles. BFV was measured by ultrasonography before insertion and 10, 20, 30, and 60 minutes after stimulation. Following acupuncture on ST36, BFV increased significantly 20 and 30 minutes after stimulation, compared to BFV before insertion (P < 0.05). Following stimulation on LR3 and the non-acupoint, no significant differences in BFV could be found. Relative to the no-stimulation group, stimulation on LR3, and the non-acupoint, stimulation on ST36 elicited a significant increase in BFV (P < 0.05). The results suggest that stimulation on the different points causes distinct physiological effects in BFV in the SMA.
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Moertl MG, Schlembach D, Papousek I, Hinghofer-Szalkay H, Weiss EM, Lang U, Lackner HK. Hemodynamic evaluation in pregnancy: limitations of impedance cardiography. Physiol Meas 2012; 33:1015-26. [DOI: 10.1088/0967-3334/33/6/1015] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ginty AT, Phillips AC, Higgs S, Heaney JLJ, Carroll D. Disordered eating behaviour is associated with blunted cortisol and cardiovascular reactions to acute psychological stress. Psychoneuroendocrinology 2012; 37:715-24. [PMID: 21962379 DOI: 10.1016/j.psyneuen.2011.09.004] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 09/07/2011] [Accepted: 09/07/2011] [Indexed: 10/17/2022]
Abstract
Research suggests a potential dysregulation of the stress response in individuals with bulimia nervosa. This study measured both cardiovascular and cortisol reactions to a standardised laboratory stress task in individuals identified as showing disordered eating behaviour to determine whether dysregulation of the stress response is characteristic of the two branches of the stress response system. Female students (N=455) were screened using two validated eating disorder questionnaires. Twelve women with disordered eating, including self-induced vomiting, and 12 healthy controls were selected for laboratory stress testing. Salivary cortisol and cardiovascular activity, via Doppler imaging and semi-automatic blood pressure monitoring, were measured at resting baseline and during and after exposure to a 10-min mental arithmetic stress task. Compared to controls the disordered eating group showed blunted cortisol, cardiac output, heart rate, and stroke volume reactions to the acute stress, as well as an attenuated vasodilatory reaction. These effects could not be accounted for in terms of group differences in stress task performance, subjective task impact/engagement, age, BMI, neuroticism, cardio-respiratory fitness, or co-morbid exercise dependence. Our findings suggest that disordered eating is characterised by a dysregulation of the autonomic stress-response system. As such, they add further weight to the general contention that blunted stress reactivity is characteristic of a number of maladaptive behaviours and states.
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Affiliation(s)
- Annie T Ginty
- School of Sport and Exercise Sciences, University of Birmingham, Birmingham B15 2TT, UK.
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Fellahi JL, Fischer MO, Rebet O, Massetti M, Gérard JL, Hanouz JL. A Comparison of Endotracheal Bioimpedance Cardiography and Transpulmonary Thermodilution in Cardiac Surgery Patients. J Cardiothorac Vasc Anesth 2012; 26:217-22. [DOI: 10.1053/j.jvca.2011.06.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Indexed: 12/20/2022]
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Abstract
The use of pulmonary artery catheters has diminished, so that other technologies are emerging. Central venous oxygen saturation measurement (ScvO₂) as a surrogate for mixed venous oxygen saturation measurement (SvO₂) is simple and clinically accessible. To maximize the clinical utility of ScvO₂ (or SvO₂) measurement, it is useful to review what the measurement means in a physiologic context,how the measurement is made, important limitations, and how this measurement may be helpful in common clinical scenarios. Compared with cardiac output measurement, SvO₂ is more directly related to tissue oxygenation. Furthermore,when tissue oxygenation is a clinical concern, SvO₂ is less prone to error compared with cardiac output, where small measurement errors may lead to larger errors in interpreting adequacy of oxygen delivery. ScvO₂ should be measured from the tip of a central venous catheter placed close to, or within, the right atrium to reduce measurement error. Correct clinical interpretation of SvO₂, or its properly measured ScvO₂ surrogate, can be used to (1) estimate cardiac output using the Fick equation, (2) better understand whether a patient's oxygen delivery is adequate to meet their oxygen demands, (3) help guide clinical practice, particularly when resuscitating patients using validated early goal directed therapy treatment protocols, (4) understand and treat arterial hypoxemia, and (5) rapidly estimate shunt fraction (venous admixture).
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Affiliation(s)
- Keith R Walley
- Critical Care Research Laboratories, Heart and Lung Institute at St. Paul's Hospital, University of British Columbia, Vancouver, British Columbia, Canada.
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Critchley LA, Yang XX, Lee A. Assessment of Trending Ability of Cardiac Output Monitors by Polar Plot Methodology. J Cardiothorac Vasc Anesth 2011; 25:536-46. [DOI: 10.1053/j.jvca.2011.01.003] [Citation(s) in RCA: 174] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Indexed: 11/11/2022]
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Fellahi JL, Caille V, Charron C, Daccache G, Vieillard-Baron A. Hemodynamic effects of positive end-expiratory pressure during abdominal hyperpression: a preliminary study in healthy volunteers. J Crit Care 2011; 27:33-6. [PMID: 21514092 DOI: 10.1016/j.jcrc.2011.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 02/25/2011] [Accepted: 03/02/2011] [Indexed: 10/18/2022]
Abstract
PURPOSE An increase in abdominal pressure induces an increase in left ventricular afterload under clinical conditions. We tested the hypothesis that positive end-expiratory pressure (PEEP) could reverse the hemodynamic consequences of abdominal hyperpression by opposing the increase in left ventricular afterload. MATERIALS AND METHODS Eight healthy volunteers were investigated during 3 experimental conditions: (1) baseline, (2) increase in abdominal pressure by means of medical antishock trousers (MAST) inflation, and (3) addition of PEEP +10 cm H(2)O. Heart loading conditions and left ventricular systolic and diastolic function were assessed by transthoracic echocardiography. RESULTS The application of PEEP significantly reduced the prior increase in end-systolic wall stress: 45 ± 11 vs 55 ± 14 kdyn/cm(2), P < .05. Medical antishock trousers inflation significantly altered the deceleration time of mitral E wave: 199 ± 23 vs 156 ± 38 milliseconds, P < .05. Left ventricular preload and global systolic performance were unaffected by MAST and PEEP applications. CONCLUSIONS The increase in left ventricular afterload induced by MAST inflation can be efficiently reduced by the use of a moderate PEEP. Potential clinical applications in the abdominal compartment syndrome or in the setting of laparoscopic surgery should be developed.
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Affiliation(s)
- Jean-Luc Fellahi
- Department of Anesthesiology and Critical Care Medicine, CHU de Caen, Caen, France.
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Ballestero Y, López-Herce J, Urbano J, Solana MJ, Botrán M, Bellón JM, Carrillo A. Measurement of cardiac output in children by bioreactance. Pediatr Cardiol 2011; 32:469-72. [PMID: 21318463 DOI: 10.1007/s00246-011-9903-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2010] [Accepted: 01/31/2011] [Indexed: 11/26/2022]
Abstract
The objective of this study was to evaluate a new bioreactance method for noninvasive cardiac output (CO) measurement (NICOM) in children. Ten patients between 1 and 144 months of age and with no hemodynamic disturbances were studied. Using bioreactance, heart rate (HR), mean arterial pressure (MAP), and cardiac index (CI) measurements were made every 6-8 h. CI was 2.4 ± 1.03 l/min/1.73 m(2) (range 1-4.9 l/min/1.73 m(2)); There were significant correlations between CI and age (r = 0.50, P = 0.003), weight (r = 0.66, P < 0.001), and MAP (r = 0.369, P = 0.037). Significant differences in CI (P < 0.001) were detected between children weighing <10 kg (1.9 ± 0.73 l/min/1.73 m(2); range 1-3.2), 10-20 kg (2.07 ± 0.7 l/min/1.73 m(2); range 1-3.6), and >20 kg (3.7 ± 0.8 l/min/1.73 m(2); range 2.4-4.9). We conclude that the CI measured by bioreactance in children varies with the age and weight of the patients and is lower than the normal range in a large percentage of measurements. These data suggest that this method is not useful for evaluating CI in small children.
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Affiliation(s)
- Yolanda Ballestero
- Pediatric Intensive Care Department, Hospital General Universitario Gregorio Marañón, 28009, Madrid, Spain
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Critchley LA, Lee A, Ho AMH. A Critical Review of the Ability of Continuous Cardiac Output Monitors to Measure Trends in Cardiac Output. Anesth Analg 2010; 111:1180-92. [DOI: 10.1213/ane.0b013e3181f08a5b] [Citation(s) in RCA: 380] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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