Experimental evaluation of a pulse contour method for calculation of cardiac output

1962 ◽  
Vol 202 (4) ◽  
pp. 622-630 ◽  
Author(s):  
Eugene F. Bernstein ◽  
Robert L. Evans
Keyword(s):  
Cardiac Output ◽  
Pressure Change ◽  
Pulse Contour ◽  
Contour Method ◽  
Dilution Method ◽  
Velocity Change ◽  
Simultaneous Comparisons ◽  
Pulse Contour Method ◽  
The Relationship ◽  
Better Than

A method of estimating cardiac output which depends on the analysis of a single propagated pressure wave and the relationship between pressure change and velocity change: Δ p = ρ c0 Δ v, has been evaluated experimentally in 84 almost simultaneous comparisons with dye dilution method measurements and 22 almost simultaneous comparisons with direct Fick measurements. A deviation of 13.4 ± 22.9% between the dye and pulse contour measurements was observed. In comparison with direct Fick measurements, the deviation was 19.1 ± 33.0%. The ability of this pulse contour method to follow changes in cardiac output was better than its ability to estimate absolute output, as indicated by these deviations. The usefulness of this pulse contour technique in estimating cardiac output in clinical and laboratory situations, with a beat-to-beat indication of changes in output, is discussed. In general, this method appears to have a useful degree of accuracy and offers a relatively simple approach to an important problem.

An Uncalibrated Pulse Contour Method to Measure Cardiac Output During Aortic Counterpulsation

2011 ◽  
Vol 113 (6) ◽  
pp. 1389-1395 ◽  
Author(s):  
Sabino Scolletta ◽  
Federico Franchi ◽  
Fabio Silvio Taccone ◽  
Katia Donadello ◽  
Bonizella Biagioli ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Pulse Contour ◽  
Contour Method ◽  
Pulse Contour Method

Comparison of estimation of cardiac output using an uncalibrated pulse contour method and echocardiography during veno-venous extracorporeal membrane oxygenation

Perfusion ◽  
2019 ◽  
Vol 35 (5) ◽  
pp. 397-401
Author(s):  
Ottavia Bond ◽  
Selene Pozzebon ◽  
Federico Franchi ◽  
Federica Zama Cavicchi ◽  
Jacques Creteur ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cardiac Output ◽  
Extracorporeal Membrane Oxygenation ◽  
Linear Regression Analysis ◽  
Pulse Contour ◽  
Contour Method ◽  
Cardiac Output Monitoring ◽  
Membrane Oxygenation ◽  
Output Monitoring ◽  
Pulse Contour Method

Introduction: During veno-venous extracorporeal membrane oxygenation, cardiac output monitoring is essential to assess tissue oxygen delivery. Adequate arterial oxygenation depends on the ratio between the extracorporeal pump blood flow and the cardiac output. The aim of this study was to compare estimates of cardiac output and blood flow/cardiac output ratios made using an uncalibrated pulse contour method with those made using echocardiography in patients treated with veno-venous extracorporeal membrane oxygenation. Methods: Cardiac output was estimated simultaneously using a pulse contour method (MostCareUp; Vygon, Encouen, France) and echocardiography in 17 hemodynamically stable patients treated with veno-venous extracorporeal membrane oxygenation. Comparisons were made using Bland–Altman and linear regression analysis. Results: There were significant correlations between cardiac output estimated using pulse contour method and echocardiography and between blood flow/cardiac output estimated using pulse contour method and blood flow/cardiac output estimated using echocardiography (r = 0.84, p < 0.001 and r = 0.87, p < 0.001, respectively). Bland–Altman analysis showed a good agreement (bias −0.20 ± 0.50 L/min) and a low percentage of error (25%) for the cardiac output values estimated by the two methods. The bias between the blood flow/cardiac output ratios obtained with the two methods was 5.19% ± 12.3% (percentage of error = 28.1%). Conclusions: The pulse contour method is a valuable alternative to echocardiography for the assessment of cardiac output and the blood flow/cardiac output ratio in patients treated with veno-venous extracorporeal membrane oxygenation.

Effects of lung collapse on pulmonary blood volume, flow and resistance

1959 ◽  
Vol 197 (1) ◽  
pp. 187-189
Author(s):  
Alceo Barrios ◽  
Colin Fell ◽  
W. F. Hamilton
Keyword(s):  
Pulmonary Artery ◽  
Blood Volume ◽  
Vascular Resistance ◽  
Aortic Pressure ◽  
Pulse Contour ◽  
Contour Method ◽  
Dilution Method ◽  
Sodium Pentobarbital ◽  
Pulmonary Blood Volume ◽  
Pulse Contour Method

Pulmonary blood flow, pressures, volume and vascular resistance were measured when the lungs occupied an expiratory position in the closed chest and when they were collapsed by introducing air into the thorax. Circulation and innervation were intact. Variations due to respiratory movements or asphyxia were ruled out. Mongrel dogs were used, anesthetized with morphine and sodium pentobarbital. Pressures were measured from pulmonary artery, left atrium, aortic arch and intrapleural space. Pulmonary flow was evaluated utilizing the dye dilution method and the pulse contour method. Vascular volume was estimated by the product of mean circulation time and flow. When the lungs were collapsed there was an immediate elevation of intraluminal left atrial pressure but not a comparable rise in pulmonary arterial pressure. However, the direct records of arteriovenous pressure drop suggest that there was a delayed rise in pulmonary artery pressure. Flow, aortic pressure, heart rate and pulmonary vascular resistance showed no consistent changes. In 8 of 11 cases the pulmonary blood volume decreased when the lungs were collapsed.

scholarly journals Comparison between an uncalibrated pulse contour method and thermodilution technique for cardiac output estimation in septic patients

2011 ◽  
Vol 107 (2) ◽  
pp. 202-208 ◽  
Author(s):  
F. Franchi ◽  
R. Silvestri ◽  
L. Cubattoli ◽  
F.S. Taccone ◽  
K. Donadello ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Pulse Contour ◽  
Contour Method ◽  
Thermodilution Technique ◽  
Pulse Contour Method
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