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Viruez-Soto A, Molano-Franco D, Merino-Luna A, Bairam A, Aliaga-Raduán F, Sanchez L, Arias-Reyes C, Soliz J. The ultrasound-based cardiac output monitoring is a useful tool to define baseline hemodynamic parameters in healthy permanent residents at high altitude: results of a monocentric pilot study. Front Physiol 2024; 14:1297872. [PMID: 38298567 PMCID: PMC10829573 DOI: 10.3389/fphys.2023.1297872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 12/19/2023] [Indexed: 02/02/2024] Open
Abstract
Previous studies on the cardiac data of healthy permanent residents living in high-altitude regions such as Tibet and the Andes have yielded inconsistent findings and significant disparities. These discrepancies can be mainly attributed to the invasive methods conventionally used for parameter evaluation. However, with the introduction of cutting-edge ultrasound technology, there is now an innovative approach to addressing and reconciling these variations. In this pilot study, we employed an ultrasound-based cardiac output monitoring (USCOM) device to evaluate cardiac output and related hemodynamic variables in a group of 20 healthy high-altitude Andean residents (comprising 10 men and 10 women) aged between 26 and 35 years old. The monocentric study was carried out in La Paz, Bolivia, located between at an altitude of 3,600-4,000 m. A total of 60 hemodynamic measurements were evaluated, accounting for three technical replicates per subject. Our results showed strong intrasubject reproducibility and revealed important differences related to both sex and hemodynamic parameters in highlanders compared to individuals residing at sea level. We conclude that USCOM represents a highly reliable technology for performing hemodynamic measurements in high-altitude residents. Our preliminary findings underscore the need for larger studies, encompassing larger sample sizes, specifically tailored to gender considerations, and extendable to broader highland populations. These findings have special significant implications for the management of hemodynamics in intensive care and postoperative settings, warranting further comprehensive research efforts.
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Affiliation(s)
- Antonio Viruez-Soto
- High Altitude Intensive Care Medicine International Group, GIMIA, La Paz, Bolivia
| | - Daniel Molano-Franco
- High Altitude Intensive Care Medicine International Group, GIMIA, Bogota, Colombia
| | - Alfredo Merino-Luna
- Carrera de Medicina Humana, Facultad de Ciencias de la Salud, Universidad San Ignacio de Loyola, Lima-Perú, Peru
| | - Aida Bairam
- Centre de Recherche de l’Institute Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Fernanda Aliaga-Raduán
- Centre de Recherche de l’Institute Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
- Bolivian Foundation of Altitude Sciences (BFAS), Brain Research Institute, La Paz, Bolivia
| | - Lida Sanchez
- Centre de Recherche de l’Institute Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
| | - Christian Arias-Reyes
- Centre de Recherche de l’Institute Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
- Bolivian Foundation of Altitude Sciences (BFAS), Brain Research Institute, La Paz, Bolivia
| | - Jorge Soliz
- Centre de Recherche de l’Institute Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
- Bolivian Foundation of Altitude Sciences (BFAS), Brain Research Institute, La Paz, Bolivia
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2
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Cave DG, Bautista MJ, Mustafa K, Bentham JR. Cardiac output monitoring in children: a review. Arch Dis Child 2023; 108:949-955. [PMID: 36927620 DOI: 10.1136/archdischild-2022-325030] [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: 11/04/2022] [Accepted: 03/02/2023] [Indexed: 03/18/2023]
Abstract
Cardiac output monitoring enables physiology-directed management of critically ill children and aids in the early detection of clinical deterioration. Multiple invasive techniques have been developed and have demonstrated ability to improve clinical outcomes. However, all require invasive arterial or venous catheters, with associated risks of infection, thrombosis and vascular injury. Non-invasive monitoring of cardiac output and fluid responsiveness in infants and children is an active area of interest and several proven techniques are available. Novel non-invasive cardiac output monitors offer a promising alternative to echocardiography and have proven their ability to influence clinical practice. Assessment of perfusion remains a challenge; however, technologies such as near-infrared spectroscopy and photoplethysmography may prove valuable clinical adjuncts in the future.
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Affiliation(s)
- Daniel Gw Cave
- Leeds Congenital Heart Unit, Leeds Teaching Hospitals NHS Trust, Leeds, UK
- Leeds Institute for Data Analytics, University of Leeds, Leeds, West Yorkshire, UK
| | - Melissa J Bautista
- General Surgery, St James's University Hospital, Leeds, West Yorkshire, UK
- General Surgery, University of Leeds, Leeds, West Yorkshire, UK
| | - Khurram Mustafa
- Paediatric Intensive Care, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - James R Bentham
- Leeds Congenital Heart Unit, Leeds Teaching Hospitals NHS Trust, Leeds, UK
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3
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Fremuth J, Huml M, Pomahacova T, Kobr J, Kormunda S, Sykora J. Stroke Volume Measurements by Echocardiography and Ultrasonic Cardiac Output Monitor in Children: A Prospective Observational Cohort Study. Pediatr Emerg Care 2023; 39:680-684. [PMID: 37478016 PMCID: PMC10487356 DOI: 10.1097/pec.0000000000003018] [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] [Indexed: 07/23/2023]
Abstract
OBJECTIVES Stroke volume (SV) and cardiac output monitoring is a cornerstone of hemodynamic assessment. Noninvasive technologies are increasingly used in children. This study compared SV measurements obtained by transcutaneous Doppler ultrasound techniques (ultrasonic cardiac output monitor [USCOM]), transthoracic echocardiography jugular (TTE-J), and parasternal (TTE-P) views performed by pediatric intensivists (OP-As) with limited training in cardiac sonography (20 previous examinations) and pediatric cardiologists (OP-Bs) with limited training in USCOM (30 previous examinations) in spontaneously ventilating children. METHODS A single-center study was conducted in 37 children. Each operator obtained 3 sets of USCOM SV measurements within a period of 3 to 5 minutes, followed with TTE measurements from both apical and jugular views. The investigators were blinded to each other's results to prevent visual and auditory bias. RESULTS Both USCOM and TTE methods were applicable in 89% of patients. The intraobserver variability of USCOM, TTE-J, and TTE-P were less than 10% in both investigators. The SV measurements by OP-As using USCOM, TTE-J, and TTE-P were 46.15 (25.48) mL, 39.45 (20.65) mL, and 33.42 (16.69) mL, respectively. The SV measurements by OP-Bs using USCOM, TTE-J, and TTE-P were 43.99 (25.24) mL, 38.91 (19.98) mL, and 37.58 (19.81) mL, respectively.The percentage error in SV with USCOM relative to TTE-J was 36% in OP-As and 37% in OP-Bs. The percentage error in SV with TTE-P was 33% relative to TTE-J in OP-As and 21% in OP-Bs. CONCLUSIONS Our findings show that the methods are not interchangeable because SV values by USCOM are higher in comparison with the SV values obtained by TTE. Both methods have low level of intraobserver variability. The SV measurements obtained by TTE-P were significantly lower compared with the TTE-J for the operator with limited training in echocardiography. The TTE-P requires longer practice compared with the TTE-J; therefore, we recommend to prefer TTE-J to TTE-P for inexperienced operators.
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Ufkes S, Zuercher M, Erdman L, Slorach C, Mertens L, Taylor KL. Automatic Prediction of Paediatric Cardiac Output From Echocardiograms Using Deep Learning Models. CJC PEDIATRIC AND CONGENITAL HEART DISEASE 2023; 2:12-19. [PMID: 37970100 PMCID: PMC10642111 DOI: 10.1016/j.cjcpc.2022.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 11/03/2022] [Indexed: 11/17/2023]
Abstract
Background Cardiac output (CO) perturbations are common and cause significant morbidity and mortality. Accurate CO assessment is crucial for guiding treatment in anaesthesia and critical care, but measurement is difficult, even for experts. Artificial intelligence methods show promise as alternatives for accurate, rapid CO assessment. Methods We reviewed paediatric echocardiograms with normal CO and a dilated cardiomyopathy patient group with reduced CO. Experts measured the left ventricular outflow tract diameter, velocity time integral, CO, and cardiac index (CI). EchoNet-Dynamic is a deep learning model for estimation of ejection fraction in adults. We modified this model to predict the left ventricular outflow tract diameter and retrained it on paediatric data. We developed a novel deep learning approach for velocity time integral estimation. The combined models enable automatic prediction of CO. We evaluated the models against expert measurements. Primary outcomes were root-mean-squared error, mean absolute error, mean average percentage error, and coefficient of determination (R2). Results In a test set unused during training, CI was estimated with the root-mean-squared error of 0.389 L/min/m2, mean absolute error of 0.321 L/min/m2, mean average percentage error of 10.8%, and R2 of 0.755. The Bland-Altman analysis showed that the models estimated CI with a bias of +0.14 L/min/m2 and 95% limits of agreement -0.58 to 0.86 L/min/m2. Conclusions Our model estimated CO with strong correlation to ground truth and a bias of 0.17 L/min, better than many CO measurements in paediatrics. Model pretraining enabled accurate estimation despite a small dataset. Potential uses include supporting clinicians in real-time bedside calculation of CO, identification of low-CO states, and treatment responses.
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Affiliation(s)
- Steven Ufkes
- Division of Genetics and Genome Biology, Centre for Computational Medicine, The Hospital for Sick Children, Research Institute, Toronto, Ontario, Canada
| | - Mael Zuercher
- Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Anesthesia, Centre hospitalier universitaire Vaudois, Lausanne, Switzerland
| | - Lauren Erdman
- Division of Genetics and Genome Biology, Centre for Computational Medicine, The Hospital for Sick Children, Research Institute, Toronto, Ontario, Canada
| | - Cameron Slorach
- Department of Cardiology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Luc Mertens
- Department of Cardiology, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada
| | - Katherine L. Taylor
- Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Anesthesia, University of Toronto, Toronto, Ontario, Canada
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5
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Koh W, Schneider KA, Zang H, Batlivala SP, Monteleone MP, Benscoter AL, Chlebowski MM, Iliopoulos ID, Cooper DS. Measurement of Cardiac Output Using an Ultrasonic Cardiac Output Monitor (USCOM) in Patients with Single-Ventricle Physiology. Pediatr Cardiol 2022; 43:1205-1213. [PMID: 35124709 DOI: 10.1007/s00246-022-02840-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 01/27/2022] [Indexed: 10/19/2022]
Abstract
We evaluate the validity of cardiac index (CI) measurements utilizing the Ultrasonic Cardiac Output Monitor (USCOM), a non-invasive Doppler ultrasound device, by comparing measurements to cardiac catheterization-derived CI measurements in patients with single-ventricle physiology. USCOM measurements were repeated three times for each patient at the beginning of a cardiac catheterization procedure for twenty-six patients undergoing elective pre-Glenn or pre-Fontan catheterization. CI was measured by USCOM and was calculated from cardiac catheterization data using Fick's method. Bland-Altman analysis for CI showed bias of 0.95 L/min/m2 with the 95% limits of agreement of - 1.85 and 3.75. Pearson's correlation coefficient was 0.89 (p < 0.001) indicating a strong positive relationship between USCOM and cardiac catheterization CI measurements. When excluding two patients with significant dilation of the neo-aortic valve (z-score > + 5), the bias improved to 0.66 L/min/m2 with the 95% limits of agreement of - 1.38 and 2.70. Percent error of limits of agreement was 34%. There was excellent intra-operator reproducibility of USCOM CI measurements with an intra-class coefficient of 0.96. We demonstrate the use of USCOM to measure CI in patients with single-ventricle physiology for the first time, showing acceptable agreement of the CI measurements between USCOM and cardiac catheterization with a high intra-operator reproducibility.
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Affiliation(s)
- Wonshill Koh
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA. .,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
| | - Kristin A Schneider
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Huaiyu Zang
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Sarosh P Batlivala
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Matthew P Monteleone
- Department of Anesthesia, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Alexis L Benscoter
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Meghan M Chlebowski
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Ilias D Iliopoulos
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - David S Cooper
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
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Pliauckiene A, Liubsys A, Vankeviciene R, Usonis V. Ultrasonic cardiac output monitor provides effective non-invasive bedside measurements of neonatal cardiac output. J Clin Monit Comput 2021; 36:803-807. [PMID: 33929641 DOI: 10.1007/s10877-021-00711-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 04/22/2021] [Indexed: 10/21/2022]
Abstract
This study determined the accuracy and validity for the haemodynamic parameters of haemodynamically stable neonates after postnatal circulatory adaptation using the ultrasonic cardiac output monitor (USCOM) in comparison with echocardiography. We conducted a prospective, observational study of neonates born at 23-41 weeks of gestation. They all underwent both echocardiography and USCOM assessments for comparison purposes. The 127 neonates were examined at the median of postmenstrual age of 35 weeks and there was a very high correlation between the cardiac output measurements provided by both methods. The mean difference in cardiac output was - 12 ± 25 ml/kg/min, with percentage error of 8.3 ± 6.9%. A larger bias was observed in cases with higher left ventricular output. Bland-Altman analysis confirmed no significant bias, with acceptable limits of agreement between these two methods. There was a very good correlation between the USCOM and echocardiographic methods when we used them to measure cardiac output in neonates.
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Affiliation(s)
- Ausrine Pliauckiene
- Clinic of Children Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania.
| | - Arunas Liubsys
- Clinic of Children Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania
| | - Ramune Vankeviciene
- Clinic of Children Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania
| | - Vytautas Usonis
- Clinic of Children Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania
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7
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Weissbach A, Rotstein A, Lakovsky Y, Kaplan E, Kadmon G, Birk E, Nahum E. Ultrasound Cardiac Output Monitor (USCOM™) Measurements Prove Unreliable Compared to Cardiac Magnetic Resonance Imaging in Adolescents with Cardiac Disease. Pediatr Cardiol 2021; 42:692-699. [PMID: 33394105 DOI: 10.1007/s00246-020-02531-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 12/23/2020] [Indexed: 10/22/2022]
Abstract
The purpose of this stuy is to prospectively assess the reliability of the ultrasound cardiac output monitor (USCOM™) for measuring stroke volume index and predicting left ventricular outflow tract diameter in adolescents with heart disease. Sixty consecutive adolescents with heart disease attending a tertiary medical center underwent USCOM™ assessment immediately after cardiac magnetic resonance imaging. USCOM™ measured stroke volume index and predicted left ventricular outflow tract diameter were compared to cardiac magnetic resonance imaging-derived values using Bland-Altman analysis. Ten patients with an abnormal left ventricular outflow tract were excluded from the analysis. An adequate USCOM™ signal was obtained in 49/50 patients. Mean stroke volume index was 46.1 ml/m2 by the USCOM™ (range 22-66.9 ml/m2) and 42.9 ml/m2 by cardiac magnetic resonance imaging (range 24.7-59.9 ml/m2). The bias (mean difference) was 3.2 ml/m2; precision (± 2SD of differences), 17 ml/m2; and mean percentage error, 38%. The mean (± 2SD) left ventricular outflow tract diameter was 0.445 ± 0.536 cm smaller by the USCOM™ algorithm prediction than by cardiac magnetic resonance imaging. Attempted adjustment of USCOM™ stroke volume index using cardiac magnetic resonance imaging left ventricular outflow tract diameter failed to improve agreement between the two modalities (bias 28.4 ml/m2, precision 44.1 ml/m2, percentage error 77.3%). Our study raises concerns regarding the reliability of USCOM™ for stroke volume index measurement in adolescents with cardiac disease, which did not improve even after adjusting for its inaccurate left ventricular outflow tract diameter prediction.
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Affiliation(s)
- Avichai Weissbach
- Pediatric Intensive Care Unit, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel. .,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel.
| | - Amichay Rotstein
- Institute of Pediatric Cardiology, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Yaniv Lakovsky
- Department of Imaging, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Eytan Kaplan
- Pediatric Intensive Care Unit, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Gili Kadmon
- Pediatric Intensive Care Unit, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Einat Birk
- Institute of Pediatric Cardiology, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Elhanan Nahum
- Pediatric Intensive Care Unit, Schneider Children's Medical Center of Israel, 4920235, Petach Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel
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8
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Russell A, Rivers EP, Giri PC, Jaehne AK, Nguyen HB. A Physiologic Approach to Hemodynamic Monitoring and Optimizing Oxygen Delivery in Shock Resuscitation. J Clin Med 2020; 9:jcm9072052. [PMID: 32629778 PMCID: PMC7408843 DOI: 10.3390/jcm9072052] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/18/2020] [Accepted: 06/27/2020] [Indexed: 12/14/2022] Open
Abstract
The approach to shock resuscitation focuses on all components of oxygen delivery, including preload, afterload, contractility, hemoglobin, and oxygen saturation. Resuscitation focused solely on preload and fluid responsiveness minimizes other key elements, resulting in suboptimal patient care. This review will provide a physiologic and practical approach for the optimization of oxygen delivery utilizing available hemodynamic monitoring technologies. Venous oxygen saturation (SvO2) and lactate will be discussed as indicators of shock states and endpoints of resuscitation within the framework of resolving oxygen deficit and oxygen debt.
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Affiliation(s)
- Amy Russell
- Department of Emergency Medicine, Loma Linda University, Loma Linda, CA 92354, USA;
| | - Emanuel P. Rivers
- Department of Emergency Medicine, Henry Ford Hospital, Detroit, MI 48202, USA; (E.P.R.); (A.K.J.)
- Surgical Critical Care, Henry Ford Hospital, Detroit, MI 48202, USA
| | - Paresh C. Giri
- Division of Pulmonary, Critical Care, Hyperbaric, Allergy, and Sleep Medicine, Loma Linda University, Loma Linda, CA 92354, USA;
| | - Anja K. Jaehne
- Department of Emergency Medicine, Henry Ford Hospital, Detroit, MI 48202, USA; (E.P.R.); (A.K.J.)
| | - H. Bryant Nguyen
- Division of Pulmonary, Critical Care, Hyperbaric, Allergy, and Sleep Medicine, Loma Linda University, Loma Linda, CA 92354, USA;
- Department of Emergency Medicine, Loma Linda University, Loma Linda, CA 92354, USA;
- Correspondence: ; Tel.: +1-909-558-4023
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9
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Blanco P. Rationale for using the velocity-time integral and the minute distance for assessing the stroke volume and cardiac output in point-of-care settings. Ultrasound J 2020; 12:21. [PMID: 32318842 PMCID: PMC7174466 DOI: 10.1186/s13089-020-00170-x] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 04/15/2020] [Indexed: 12/27/2022] Open
Abstract
Background Stroke volume (SV) and cardiac output (CO) are basic hemodynamic parameters which aid in targeting organ perfusion and oxygen delivery in critically ill patients with hemodynamic instability. While there are several methods for obtaining this data, the use of transthoracic echocardiography (TTE) is gaining acceptance among intensivists and emergency physicians. With TTE, there are several points that practitioners should consider to make estimations of the SV/CO as simplest as possible and avoid confounders. Main body With TTE, the SV is usually obtained as the product of the left ventricular outflow tract (LVOT) cross-sectional area (CSA) by the LVOT velocity–time integral (LVOT VTI); the CO results as the product of the SV and the heart rate (HR). However, there are important drawbacks, especially when obtaining the LVOT CSA and thus the impaction in the calculated SV and CO. Given that the LVOT CSA is constant, any change in the SV and CO is highly dependent on variations in the LVOT VTI; the HR contributes to CO as well. Therefore, the LVOT VTI aids in monitoring the SV without the need to calculate the LVOT CSA; the minute distance (i.e., SV × HR) aids in monitoring the CO. This approach is useful for ongoing assessment of the CO status and the patient’s response to interventions, such as fluid challenges or inotropic stimulation. When the LVOT VTI is not accurate or cannot be obtained, the mitral valve or right ventricular outflow tract VTI can also be used in the same fashion as LVOT VTI. Besides its pivotal role in hemodynamic monitoring, the LVOT VTI has been shown to predict outcomes in selected populations, such as in patients with acute decompensated HF and pulmonary embolism, where a low LVOT VTI is associated with a worse prognosis. Conclusion The VTI and minute distance are simple, feasible and reproducible measurements to serially track the SV and CO and thus their high value in the hemodynamic monitoring of critically ill patients in point-of-care settings. In addition, the LVOT VTI is able to predict outcomes in selected populations.
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Affiliation(s)
- Pablo Blanco
- Intensive Care Physician, Intensive Care Unit, Clínica Cruz Azul, 2651, 60 St., 7630, Necochea, Argentina.
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10
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Chaiyakulsil C, Chantra M, Katanyuwong P, Khositseth A, Anantasit N. Comparison of three non-invasive hemodynamic monitoring methods in critically ill children. PLoS One 2018; 13:e0199203. [PMID: 29912937 PMCID: PMC6005547 DOI: 10.1371/journal.pone.0199203] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 04/25/2018] [Indexed: 11/18/2022] Open
Abstract
Introduction Hemodynamic parameters measurements were widely conducted using pulmonary artery catheter (PAC) with thermodilution as a reference standard. Due to its technical difficulties in children, transthoracic echocardiography (TTE) has been widely employed instead. Nonetheless, TTE requires expertise and is time-consuming. Noninvasive cardiac output monitoring such as ultrasonic cardiac output monitor (USCOM) and electrical velocimetry (EV) can be performed rapidly with less expertise requirement. Presently, there are inconsistent evidences, variable precision, and reproducibility of EV, USCOM and TTE measurements. Our objective was to compare USCOM, EV and TTE in hemodynamic measurements in critically ill children. Materials and methods This was a single center, prospective observational study in critically ill children. Children with congenital heart diseases and unstable hemodynamics were excluded. Simultaneous measurements of hemodynamic parameters were conducted using USCOM, EV, and TTE. Inter-rater reliability was determined. Bland-Altman plots were used to analyse agreement of assessed parameters. Results Analysis was performed in 121 patients with mean age of 4.9 years old and 56.2% of male population. Interrater reliability showed acceptable agreement in all measured parameters (stroke volume (SV), cardiac output (CO), velocity time integral (VTI), inotropy (INO), flow time corrected (FTC), aortic valve diameter (AV), systemic vascular resistance (SVR), and stroke volume variation (SVV); (Cronbach’s alpha 0.76–0.98). Percentages of error in all parameters were acceptable by Bland-Altman analysis (9.2–28.8%) except SVR (30.8%) and SVV (257.1%). Conclusion Three noninvasive methods might be used interchangeably in pediatric critical care settings with stable hemodynamics. Interpretation of SVV and SVR measurements must be done with prudence.
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Affiliation(s)
- Chanapai Chaiyakulsil
- Department of Pediatrics, Division of Pediatric Critical Care, Department of Pediatric, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Marut Chantra
- Department of Pediatrics, Division of Pediatric Critical Care, Department of Pediatric, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Poomiporn Katanyuwong
- Department of Pediatrics, Division of Cardiology, Department of Pediatric, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Anant Khositseth
- Department of Pediatrics, Division of Pediatric Critical Care, Department of Pediatric, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
- Department of Pediatrics, Division of Cardiology, Department of Pediatric, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Nattachai Anantasit
- Department of Pediatrics, Division of Pediatric Critical Care, Department of Pediatric, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
- * E-mail:
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11
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Nguyen LS, Squara P. Non-Invasive Monitoring of Cardiac Output in Critical Care Medicine. Front Med (Lausanne) 2017; 4:200. [PMID: 29230392 PMCID: PMC5715400 DOI: 10.3389/fmed.2017.00200] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 11/02/2017] [Indexed: 12/21/2022] Open
Abstract
Critically ill patients require close hemodynamic monitoring to titrate treatment on a regular basis. It allows administering fluid with parsimony and adjusting inotropes and vasoactive drugs when necessary. Although invasive monitoring is considered as the reference method, non-invasive monitoring presents the obvious advantage of being associated with fewer complications, at the expanse of accuracy, precision, and step-response change. A great many methods and devices are now used over the world, and this article focuses on several of them, providing with a brief review of related underlying physical principles and validation articles analysis. Reviewed methods include electrical bioimpedance and bioreactance, respiratory-derived cardiac output (CO) monitoring technique, pulse wave transit time, ultrasound CO monitoring, multimodal algorithmic estimation, and inductance thoracocardiography. Quality criteria with which devices were reviewed included: accuracy (closeness of agreement between a measurement value and a true value of the measured), precision (closeness of agreement between replicate measurements on the same or similar objects under specified conditions), and step response change (delay between physiological change and its indication). Our conclusion is that the offer of non-invasive monitoring has improved in the past few years, even though further developments are needed to provide clinicians with sufficiently accurate devices for routine use, as alternative to invasive monitoring devices.
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Affiliation(s)
- Lee S Nguyen
- Critical Care Medicine Department, CMC Ambroise Paré, Neuilly-sur-Seine, France
| | - Pierre Squara
- Critical Care Medicine Department, CMC Ambroise Paré, Neuilly-sur-Seine, France
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Huygh J, Peeters Y, Bernards J, Malbrain MLNG. Hemodynamic monitoring in the critically ill: an overview of current cardiac output monitoring methods. F1000Res 2016; 5. [PMID: 28003877 PMCID: PMC5166586 DOI: 10.12688/f1000research.8991.1] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/07/2016] [Indexed: 01/12/2023] Open
Abstract
Critically ill patients are often hemodynamically unstable (or at risk of becoming unstable) owing to hypovolemia, cardiac dysfunction, or alterations of vasomotor function, leading to organ dysfunction, deterioration into multi-organ failure, and eventually death. With hemodynamic monitoring, we aim to guide our medical management so as to prevent or treat organ failure and improve the outcomes of our patients. Therapeutic measures may include fluid resuscitation, vasopressors, or inotropic agents. Both resuscitation and de-resuscitation phases can be guided using hemodynamic monitoring. This monitoring itself includes several different techniques, each with its own advantages and disadvantages, and may range from invasive to less- and even non-invasive techniques, calibrated or non-calibrated. This article will discuss the indications and basics of monitoring, further elaborating on the different techniques of monitoring.
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Affiliation(s)
- Johan Huygh
- ZNA Stuivenberg, Lange Beeldekensstraat 267, B-2060 Antwerpen, Belgium
| | - Yannick Peeters
- ZNA Stuivenberg, Lange Beeldekensstraat 267, B-2060 Antwerpen, Belgium
| | - Jelle Bernards
- ZNA Stuivenberg, Lange Beeldekensstraat 267, B-2060 Antwerpen, Belgium
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13
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Beltramo F, Menteer J, Razavi A, Khemani RG, Szmuszkovicz J, Newth CJL, Ross PA. Validation of an Ultrasound Cardiac Output Monitor as a Bedside Tool for Pediatric Patients. Pediatr Cardiol 2016; 37:177-83. [PMID: 26364291 DOI: 10.1007/s00246-015-1261-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 08/27/2015] [Indexed: 12/13/2022]
Abstract
The aim of our study was to determine the validity of cardiac output (CO) measurements taken with the ultrasonic cardiac output monitor (USCOM) by comparing to CO measured by pulmonary arterial catheter (PAC) thermodilution during cardiac catheterization. We enrolled thirty-one children (<18 years) undergoing cardiac catheterization in this double-blinded, prospective, observational study. The median CO measured by USCOM was 4.37 L/min (IQR 3.73, 5.60 L/min) compared to 4.28 L/min (IQR 3.52, 5.26 L/min) by PAC thermodilution. The bias (mean difference) between the two methods was 0.2 L/min, and the 95% limits of agreement were -1.2 to 1.6 L/min. The mean percentage error of CO between USCOM and PAC thermodilution was 11%. When excluding a sole outlier, the bias between the two measures decreased to 0.1 L/min (95% limits of agreement -0.6 to 0.9 L/min), and the percentage error was reduced to 8%. The median SVRI measured by USCOM was 22.0 Wood Units (IQR 17.0, 26.8 Wood Units) compared to 22.1 Wood Units (IQR 17.6, 27.4 Wood Units) by PAC thermodilution. Bias (mean difference) between the two methods was -0.6 Wood Units, and the 95% limits of agreement were -8.2 to 6.9 Wood Units. We found that the estimation of CO and by extension SVRI with USCOM is reliable against pulmonary artery catheter thermodilution in children with normal cardiac anatomy. Given the noninvasive nature of USCOM, speed of measurement, and relative ease of use, it may be useful as a bedside tool for pediatric patients.
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Affiliation(s)
- Fernando Beltramo
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA
| | - Jondavid Menteer
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA.,University of Southern California Keck School of Medicine, Los Angeles, CA, USA
| | - Asma Razavi
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA
| | - Robinder G Khemani
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA.,University of Southern California Keck School of Medicine, Los Angeles, CA, USA
| | - Jacqueline Szmuszkovicz
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA.,University of Southern California Keck School of Medicine, Los Angeles, CA, USA
| | - Christopher J L Newth
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA.,University of Southern California Keck School of Medicine, Los Angeles, CA, USA
| | - Patrick A Ross
- Children's Hospital Los Angeles, 4650 West Sunset Boulevard, Mailstop # 3, Los Angeles, CA, 90027, USA. .,University of Southern California Keck School of Medicine, Los Angeles, CA, USA.
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14
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Blanco P, Aguiar FM, Blaivas M. Rapid Ultrasound in Shock (RUSH) Velocity-Time Integral: A Proposal to Expand the RUSH Protocol. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2015; 34:1691-700. [PMID: 26283755 DOI: 10.7863/ultra.15.14.08059] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 12/17/2014] [Indexed: 05/22/2023]
Abstract
Ultrasound assessment of patients in shock is becoming the standard of care in emergency and critical care settings worldwide. One of the most common protocols used for this assessment is the rapid ultrasound in shock (RUSH) examination. The RUSH protocol is a rapid evaluation of cardiac function, key vascular structures, and likely sources of hypotension. Stroke volume is an established important value to assess in the setting of shock, allowing the provider to predict the patient's response to treatment. However, the calculation of stroke volume or its surrogates is not part of any protocol, including RUSH. We propose the addition of ultrasound calculation of stroke volume or surrogates to the RUSH protocol and provide support for its utility and relative ease of calculation. The resulting product would be the RUSH velocity-time integral protocol.
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Affiliation(s)
- Pablo Blanco
- Intensive Care Unit, Hospital Dr Emilio Ferreyra, Necochea, Argentina
| | | | - Michael Blaivas
- University of South Carolina School of Medicine, Colombia, South Carolina
USA and Department of Emergency Medicine, St Francis Hospital, Columbus,
Georgia
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15
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Suehiro K, Joosten A, Murphy LSL, Desebbe O, Alexander B, Kim SH, Cannesson M. Accuracy and precision of minimally-invasive cardiac output monitoring in children: a systematic review and meta-analysis. J Clin Monit Comput 2015; 30:603-20. [PMID: 26315477 DOI: 10.1007/s10877-015-9757-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Accepted: 08/19/2015] [Indexed: 12/14/2022]
Abstract
Several minimally-invasive technologies are available for cardiac output (CO) measurement in children, but the accuracy and precision of these devices have not yet been evaluated in a systematic review and meta-analysis. We conducted a comprehensive search of the medical literature in PubMed, Cochrane Library of Clinical Trials, Scopus, and Web of Science from its inception to June 2014 assessing the accuracy and precision of all minimally-invasive CO monitoring systems used in children when compared with CO monitoring reference methods. Pooled mean bias, standard deviation, and mean percentage error of included studies were calculated using a random-effects model. The inter-study heterogeneity was also assessed using an I(2) statistic. A total of 20 studies (624 patients) were included. The overall random-effects pooled bias, and mean percentage error were 0.13 ± 0.44 l min(-1) and 29.1 %, respectively. Significant inter-study heterogeneity was detected (P < 0.0001, I(2) = 98.3 %). In the sub-analysis regarding the device, electrical cardiometry showed the smallest bias (-0.03 l min(-1)) and lowest percentage error (23.6 %). Significant residual heterogeneity remained after conducting sensitivity and subgroup analyses based on the various study characteristics. By meta-regression analysis, we found no independent effects of study characteristics on weighted mean difference between reference and tested methods. Although the pooled bias was small, the mean pooled percentage error was in the gray zone of clinical applicability. In the sub-group analysis, electrical cardiometry was the device that provided the most accurate measurement. However, a high heterogeneity between studies was found, likely due to a wide range of study characteristics.
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Affiliation(s)
- Koichi Suehiro
- Department of Anesthesiology and Perioperative Care, University of California, Irvine, Irvine, CA, USA. .,Department of Anesthesiology, Osaka City University Graduate School of Medicine, 1-5-7 Asahimachi, Abenoku, Osaka City, Osaka, 545-8586, Japan.
| | - Alexandre Joosten
- Department of Anesthesiology and Perioperative Care, University of California, Irvine, Irvine, CA, USA.,Department of Anesthesiology and Critical Care, Erasme University Hospital, Free University of Brussels, Brussels, Belgium
| | - Linda Suk-Ling Murphy
- Ayala Science Library Reference Department, University of California, Irvine, Irvine, CA, USA
| | - Olivier Desebbe
- Department of Anesthesiology and Perioperative Care, University of California, Irvine, Irvine, CA, USA.,EA 4169 INSERM US 7 CNRS UMS 3453, University Lyon 1, Lyon, France
| | - Brenton Alexander
- Department of Anesthesiology and Perioperative Care, University of California, Irvine, Irvine, CA, USA
| | - Sang-Hyun Kim
- Department of Anesthesiology and Perioperative Care, University of California, Irvine, Irvine, CA, USA.,Department of Anesthesiology and Pain Medicine, Soonchunhyang University College of Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
| | - Maxime Cannesson
- Department of Anesthesiology and Perioperative Care, University of California, Irvine, Irvine, CA, USA
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16
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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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17
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McNamara H, Barclay P, Sharma V. Accuracy and precision of the ultrasound cardiac output monitor (USCOM 1A) in pregnancy: comparison with three-dimensional transthoracic echocardiography. Br J Anaesth 2014; 113:669-76. [DOI: 10.1093/bja/aeu162] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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18
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Li YL, Chan CPY, Sin KK, Chan SSW, Lin PY, Chen XH, Smith BE, Joynt GM, Graham CA, Rainer TH. Validating a pragmatic definition of shock in adult patients presenting to the ED. Am J Emerg Med 2014; 32:1345-50. [PMID: 25227979 DOI: 10.1016/j.ajem.2014.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 08/12/2014] [Indexed: 12/29/2022] Open
Abstract
OBJECTIVE The importance of the early recognition of shock in patients presenting to emergency departments is well recognized, but at present, there is no agreed practical definition for undifferentiated shock. The main aim of this study was to validate an a priori clinical definition of shock against 28-day mortality. DESIGN, SETTING AND SUBJECTS This prospective, observational, cross-sectional, single-center study was conducted in Hong Kong, China. Data were collected between July 1, 2012, and January 31, 2013. An a priori definition of shock was designed, whereby patients admitted to the resuscitation room or high dependency area of the emergency department were divided into 1 of 3 groups-no shock, possible shock, and shock. The primary outcome was 28-day mortality. Secondary outcomes were in-hospital mortality or admission to the intensive or coronary care unit. MEASUREMENTS AND MAIN RESULTS A total of 111 patients (mean age, 67.2 ± 17.1 years; male = 69 [62%]) were recruited, of which 22 were classified as no shock, 54 as possible shock, and 35 as shock. Systolic blood pressure, mean arterial pressure, lactate, and base deficit correlated well with shock classifications (P < .05). Patients who had 3 or more positively defined shock variables had a 100% poor composite outcome rate (5 of 5). Patients with 2 shock variables had a 66.7% (4 of 6) poor composite outcome rate. CONCLUSIONS A simple, practical definition of undifferentiated shock has been proposed and validated in a group of patients presenting to an emergency department in Hong Kong. This definition needs further validation in a larger population and other settings.
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Affiliation(s)
- Yan-ling Li
- Accident and Emergency Medicine Academic Unit, The Chinese University of Hong Kong, Hong Kong, China; Emergency Department, The Second Affiliated Hospital of Guangzhou Medical University, China.
| | - Cangel Pui-yee Chan
- Accident and Emergency Medicine Academic Unit, The Chinese University of Hong Kong, Hong Kong, China.
| | - King-keung Sin
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong, China.
| | - Stewart S W Chan
- Accident and Emergency Medicine Academic Unit, The Chinese University of Hong Kong, Hong Kong, China.
| | - Pei-yi Lin
- Emergency Department, The Second Affiliated Hospital of Guangzhou Medical University, China.
| | - Xiao-hui Chen
- Emergency Department, The Second Affiliated Hospital of Guangzhou Medical University, China.
| | - Brendan E Smith
- School of Biomedical Science, Charles Sturt University, Bathurst, New South Wales, Australia; Intensive Care Unit, Bathurst Base Hospital, Bathurst, New South Wales, Australia.
| | - Gavin M Joynt
- Anesthesia and Intensive Care, The Chinese University of Hong Kong, Hong Kong, China.
| | - Colin A Graham
- Accident and Emergency Medicine Academic Unit, The Chinese University of Hong Kong, Hong Kong, China.
| | - Timothy H Rainer
- Accident and Emergency Medicine Academic Unit, The Chinese University of Hong Kong, Hong Kong, China.
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19
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Kanmaz HG, Sarikabadayi YU, Canpolat E, Altug N, Oguz SS, Dilmen U. Effects of red cell transfusion on cardiac output and perfusion index in preterm infants. Early Hum Dev 2013; 89:683-6. [PMID: 23707049 DOI: 10.1016/j.earlhumdev.2013.04.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 04/29/2013] [Accepted: 04/30/2013] [Indexed: 11/28/2022]
Abstract
OBJECTIVE/AIM The present investigation was designed to study the effect of blood transfusion on cardiac output and perfusion index. The aim was to demonstrate a relationship between hematocrit, lactate, cardiac output and perfusion index in anemic preterm infants and to investigate significant changes in these parameters induced by RBC transfusion. METHODS Anemic infants who were under 35 weeks of gestational age (GA) and were in a stable clinical condition without respiratory or cardiac problems, signs of sepsis, or renal disease at the time of investigation were enrolled in the study. Enrolled infants received 15 ml/kg pure red blood cells over 4 h. Hematocrit and lactate levels were studied before and after transfusion. Cardiac output was measured by an ultrasound device (USCOM 1A) and perfusion index was monitored by pulse oximeter (MasimoRad7). RESULTS Cardiac output decreased by 9% (p < 0.05), due to decrease in heart rate by 10% (p < 0.05) and stroke volume significantly by 5% (p < 0.05) both in left and right sided cardiac measurements. Perfusion index significantly increased and lactate levels significantly decreased after transfusion (p < 0.05). Htc was inversely correlated with lactate levels, HR, CI and CO (r = -0.33, p = 0.01; r = -0.53, p = 0; r = -0.37, p = 0.004, r = -0.28, p = 0.03). PI was not significantly correlated with Htc levels before and after transfusion (r = 0.07, p = 0.7 and r = 0.007, p =0.97). CONCLUSION Our data support that heart rate, CO and CI and lactate levels increased as a response to anemia in preterm infants and RBC transfusion improved perfusion index suggesting better tissue oxygenation.
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Affiliation(s)
- H Gozde Kanmaz
- Zekai Tahir Burak Maternity Teaching Hospital; Division of Neonatology, Turkey.
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20
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Noninvasive transcutaneous Doppler ultrasound-derived hemodynamic reference ranges in Chinese adolescents. Pediatr Crit Care Med 2013; 14:e225-32. [PMID: 23439468 DOI: 10.1097/pcc.0b013e3182772f78] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The ultrasonic cardiac output monitor is a noninvasive, quantitative method for measuring and monitoring cardiovascular hemodynamic parameters in patients. The aims of this study were first to establish reference ranges for cardiovascular indices measured by the ultrasonic cardiac output monitor in Chinese children aged 12-18 yr, second to assess the interobserver reliability of the method, and third to compare these ranges with a Caucasian group from Australia. DESIGN, SETTING, AND SUBJECTS This was a population-based cross-sectional cohort study of Chinese adolescents 12-18 years old, performed in secondary schools in Hong Kong. INTERVENTIONS Ultrasonic cardiac output monitor scans were performed on each subject to measure stroke volume, cardiac output, and systemic vascular resistance together with standard oscillometric measurement of blood pressure and heart rate. Ultrasonic cardiac output monitor parameters were also standardized by deriving body surface area referenced indices. Normal ranges were defined as lying within two standard deviations on either side of the mean. To assess interobserver variability, a second, blinded operator repeated 17% of scans. MEASUREMENTS AND MAIN RESULTS A total of 590 Chinese adolescents (49% boys) were scanned. Normal ranges for cardiac output, cardiac index, stroke volume, stroke volume index, stroke volume resistance, and systemic vascular resistance index are presented. Males had a significantly higher mean stroke volume, cardiac output, and systemic vascular resistance index compared with females (p < 0.05), but no significant differences were found for the indexed values. When compared with a group of 31 Australian Caucasian adolescents (71% boys), Chinese adolescents have a significantly lower cardiac output and stroke volume (p <0.05), but these differences disappeared when adjusted for body surface area (i.e., stroke volume index, cardiac index, and systemic vascular resistance index). Interobserver variability of ultrasonic cardiac output monitor-derived stroke volume showed a coefficient of variation of 10.2%, a correlation coefficient of 0.90 (95% confidence interval 0.85-0.93), while Bland-Altman analysis showed a mean bias of 1.5% (95% limits of agreement were -19.9% to 23.0%). CONCLUSIONS This study presents normal values for cardiovascular indices in Chinese adolescents using the ultrasonic cardiac output monitor. When referenced to body surface area, the differences between Caucasians and Chinese were insignificant.
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Pees C, Glagau E, Hauser J, Michel-Behnke I. Reference values of aortic flow velocity integral in 1193 healthy infants, children, and adolescents to quickly estimate cardiac stroke volume. Pediatr Cardiol 2013; 34:1194-200. [PMID: 23344893 DOI: 10.1007/s00246-012-0628-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 12/27/2012] [Indexed: 11/27/2022]
Abstract
The aortic velocity time integral (VTI) is an echocardiographic tool used to estimate cardiac output (CO) by multiplying it with the aortic valve (AV) area and heart rate (HR). Inaccurate measurement of AV diameter will lead to squared miscalculation of CO. The aortic VTI itself can serve as a left-ventricular (LV) output parameter. The normal range of aortic VTI in adulthood is relatively stable, compared with childhood, but reference data are lacking. The aim of this study was to establish reference values of VTI in infants, children, and adolescents. A retrospective analysis of 1223 echocardiographic examinations of healthy children (age 0-20 years, body surface area [BSA] 0.11-2.23 m(2)) was performed. Data were correlated with age, BSA, and HR, and age subgroups with normal distribution were determined. Interobserver and intraobserver variability was calculated. Aortic VTI ranged from mean 13.8 cm (10.0-18.4 cm 5-95th percentile) in neonates to 25.1 cm (19.6-32.8 cm 5-95th percentile) in children >17 years of age and had a positive correlation with age (r = 0.685, p < 0.001), BSA (r = 0.645, p < 0.001) and a negative correlation with HR (r = -0.710, p < 0.001). Interobserver and intraobserver variability were excellent (3.9 ± 3.1 and 4.6 ± 3.7 %, respectively). Calculated mean values and percentile charts for the different age groups can serve as reference data to easily judge LV output in patients with or without congenital heart disease without enlargement or dysfunction of the AV.
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Affiliation(s)
- Christiane Pees
- Division of Pediatric Cardiology, Pediatric Heart Center Vienna, University Children's Hospital Vienna, Medical University Vienna, 1090 Vienna/Wien, Austria.
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22
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Durand P, Bailly Salin J, Roulleau P. Monitoring hémodynamique non invasif chez l’enfant. MEDECINE INTENSIVE REANIMATION 2013. [DOI: 10.1007/s13546-013-0656-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pulmonary Artery Catheter (PAC) Accuracy and Efficacy Compared with Flow Probe and Transcutaneous Doppler (USCOM): An Ovine Cardiac Output Validation. Crit Care Res Pract 2012; 2012:621496. [PMID: 22649718 PMCID: PMC3357512 DOI: 10.1155/2012/621496] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 02/23/2012] [Indexed: 12/13/2022] Open
Abstract
Background. The pulmonary artery catheter (PAC) is an accepted clinical method of measuring cardiac output (CO) despite no prior validation. The ultrasonic cardiac output monitor (USCOM) is a noninvasive alternative to PAC using Doppler ultrasound (CW). We compared PAC and USCOM CO measurements against a gold standard, the aortic flow probe (FP), in sheep at varying outputs. Methods. Ten conscious sheep, with implanted FPs, had measurements of CO by FP, USCOM, and PAC, at rest and during intervention with inotropes and vasopressors. Results. CO measurements by FP, PAC, and USCOM were 4.0 ± 1.2 L/min, 4.8 ± 1.5 L/min, and 4.0 ± 1.4 L/min, respectively, (n = 280, range 1.9 L/min to 11.7 L/min). Percentage bias and precision between FP and PAC, and FP and USCOM was -17 and 47%, and 1 and 36%, respectively. PAC under-measured Dobutamine-induced CO changes by 20% (relative 66%) compared with FP, while USCOM measures varied from FP by 3% (relative 10%). PAC reliably detected -30% but not +40% CO changes, as measured by receiver operating characteristic area under the curve (AUC), while USCOM reliably detected ±5% changes in CO (AUC > 0.70). Conclusions. PAC demonstrated poor accuracy and sensitivity as a measure of CO. USCOM provided equivalent measurements to FP across a sixfold range of outputs, reliably detecting ±5% changes.
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Holley A, Lukin W, Paratz J, Hawkins T, Boots R, Lipman J. Review article: Part one: Goal-directed resuscitation--which goals? Haemodynamic targets. Emerg Med Australas 2012; 24:14-22. [PMID: 22313555 DOI: 10.1111/j.1742-6723.2011.01516.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The use of appropriate resuscitation targets or end-points may facilitate early detection and appropriate management of shock. There is a fine balance between oxygen delivery and consumption, and when this is perturbed, an oxygen debt is generated. In this narrative review, we explore the value of global haemodynamic resuscitation end-points, including pulse rate, blood pressure, central venous pressure and mixed/central venous oxygen saturations. The evidence supporting the reliability of these parameters as end-points for guiding resuscitation and their potential limitations are evaluated.
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Affiliation(s)
- Anthony Holley
- Department of Intensive Care Medicine, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia.
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25
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Abstract
PURPOSE OF REVIEW Emergency department patients are frequently undifferentiated, need accurate risk assessment and stratification, and are time-critical in their need for diagnosis and resuscitation. Valid, noninvasive hemodynamic monitoring modalities are essential to differentiate high from low risk patients, and to perform goal-directed management. This review analyses recent literature, which describes innovation in the range of noninvasive monitoring tools and places them in the emergency medicine context. RELEVANT FINDINGS A range of noninvasive measures of hemodynamic status are both commonly used, or are in the research and development phase. Pulse oximetry waveforms, electrocardiogram-based heart rate variability, Doppler and B-mode ultrasound, echocardiography, transthoracic bioimpedance, pressure pulse waveform analysis and near-infrared spectroscopy all have potential value in diagnosis and monitoring of hemodynamics, particularly used to explore autonomic nervous system control of cardiovascular function and by extension the early phases of compensation for illness and injury. Noninvasive techniques coupled with advances in data visualization and pattern recognition bring the potential for revolution to emergency department hemodynamic monitoring. SUMMARY Noninvasive measures of hemodynamic status and function are increasingly being used, although much still remains in the research domain. Noninvasive measures may not only offer similar variables to traditional vital signs, but add a new dimension of hemodynamic descriptors.
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Physiologic and Clinical Principles behind Noninvasive Resuscitation Techniques and Cardiac Output Monitoring. Cardiol Res Pract 2011; 2012:531908. [PMID: 21860802 PMCID: PMC3157155 DOI: 10.1155/2012/531908] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 05/13/2011] [Accepted: 05/15/2011] [Indexed: 01/20/2023] Open
Abstract
Clinical assessment and vital signs are poor predictors of the overall hemodynamic state. Optimal measurement of the response to fluid resuscitation and hemodynamics has previously required invasive measurement with radial and pulmonary artery catheterization. Newer noninvasive resuscitation technology offers the hope of more accurately and safely monitoring a broader range of critically ill patients while using fewer resources. Fluid responsiveness, the cardiac response to volume loading, represents a dynamic method of improving upon the assessment of preload when compared to static measures like central venous pressure. Multiple new hemodynamic monitors now exist that can noninvasively report cardiac output and oxygen delivery in a continuous manner. Proper assessment of the potential future role of these techniques in resuscitation requires understanding the underlying physiologic and clinical principles, reviewing the most recent literature examining their clinical validity, and evaluating their respective advantages and limitations.
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