Accuracy of the thermodilution method in estimating high flow - an in vitro study

Jarvis, K. A.; Woliner, M. J.; Steffey, Eugene

doi:10.1111/j.1467-2995.1992.tb00084.x

Cited by 3 publications

(1 citation statement)

References 18 publications

(33 reference statements)

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“…Elkayam et al (1983) demonstrated that thermodilution overestimated actual flow, due to loss of the thermal indicator. However, other workers using a constant flow model have shown that thermodilution underestimates flow at the flow rates observed in this study (Jarvis et al 1992). Some authors believe that errors are so great in conditions of pulsatile flow that little reliance can be placed on any absolute measurement of cardiac output by thermodilution (Mackenzie et al 1986); whereas others suggest that with due precautions and attention to detail, thermodilution provides an accurate means of measuring cardiac output (Ganz et al 1971;Levett and Repogle 1979) and may be considered a reference technique (Stetz et al 1982).…”

Section: Discussioncontrasting

confidence: 68%

Measurement of cardiac output in standing horses by Doppler echocardiography and thermodilution

Blissitt

Young

Jones

et al. 1997

Equine Veterinary Journal

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Summary Measurements of cardiac output by Doppler echocardiography were compared to simultaneous measurements by thermodilution in 9 conscious horses. In the Doppler technique, mean blood flow velocities for estimation of cardiac output were recorded from the aorta and pulmonary artery. The flow area of each vessel was calculated from the vessel diameter, measured from a 2‐dimensional ultrasound image. Differences in the site and method of measuring the vessel diameter altered the estimation of cardiac output by the Doppler method. Cardiac output was modified by the i.v. infusion of 4 μg/kg bwt/min dopamine and 4 μg/kg bwt/min dobutamine and by the i.v. administration of 10 μg/kg bwt detomidine and 20 μg/kg bwt butorphanol. Doppler measurements of cardiac output correlated closely with measurement by thermodilution. Measurements from the aortic outflow correlated more closely with thermodilution, than those from the pulmonary artery (r = 0.89 and r = 0.77, respectively). Doppler measurements agreed most closely with thermodilution measurements when the mean flow velocity was recorded from the aorta and the flow area was measured from the ascending aorta using the leading edge method. There was no significant bias between the 2 techniques when Doppler flow velocities were recorded by this method and the limits of agreement were narrow (±12.26 l/min). The differences between the 2 methods increased with increasing cardiac output. Doppler echocardiography is a safe noninvasive method of measuring cardiac output in horses. The agreement between Doppler echocardiography and thermodilution in this study is similar to that reported in man and is similar to that reported between thermodilution and other techniques in man.

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Section: Discussioncontrasting

confidence: 68%

Measurement of cardiac output in standing horses by Doppler echocardiography and thermodilution

Blissitt

Young

Jones

et al. 1997

Equine Veterinary Journal

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The Concept and Building of a Simulation Device to Check the Cardiac Output Measurement Through the Pulmonary Artery Catheter

de Abreu,

de Abreu

2023

Biomedical Materials & Devices

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Effect of thermodilution injectate volume and temperature on the accuracy and precision of cardiac output measurements for healthy anesthetized horses

Jenny¹,

Hopster²,

Hurcombe³

2021

ajvr

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OBJECTIVE To compare the accuracy and precision of cardiac output (CO) measurements derived from 4 thermodilution protocols that used different injectate temperatures and volumes in healthy adult horses. ANIMALS 8 healthy adult horses. PROCEDURES Horses were anesthetized and instrumented with Swan-Ganz catheters. The CO was derived from each of 4 thermodilution protocols (IV injection of physiologic saline [0.9% NaCl] solution chilled to < 5 °C at volumes of 1 mL/15 kg of body weight [protocol A; control], 1 mL/25 kg [protocol B], and 1 mL/35 kg [protocol C] or maintained at 17 °C at a volume of 1 mL/15 kg [protocol D]) 3 times during each of 5 measurement cycles, with a 30-minute interval between cycles. During each measurement cycle, protocol A was performed first, and protocols B, C, and D were performed in a randomized order. Mean CO and within-subject variance in CO were compared among the 4 protocols. RESULTS Mean CO did not differ significantly among the 4 protocols. The within-subject variance for CO measurements derived from protocols C and D, but not protocol B, was significantly greater than that for protocol A (control). CONCLUSIONS AND CLINICAL RELEVANCE Results suggested that, in healthy adult horses, decreasing the thermodilution injectate volume to 1 mL/25 kg from the recommended volume of 1 mL/15 kg did not adversely affect the accuracy or precision of CO measurements. However, use of smaller injectate volumes or use of injectate at approximately room temperature is not recommended owing to a clinically unacceptable increase in CO measurement variability.

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Accuracy of the thermodilution method in estimating high flow - an in vitro study

Cited by 3 publications

References 18 publications

Measurement of cardiac output in standing horses by Doppler echocardiography and thermodilution

Measurement of cardiac output in standing horses by Doppler echocardiography and thermodilution

The Concept and Building of a Simulation Device to Check the Cardiac Output Measurement Through the Pulmonary Artery Catheter

Effect of thermodilution injectate volume and temperature on the accuracy and precision of cardiac output measurements for healthy anesthetized horses

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