Measurement of cardiac output by thermodilution: Development of accurate measurements at flows applicable to the pediatric patient

Moodie, Douglas S.; Feldt, Robert; Kaye, Michael P.; Strelow, David A.; Hagen, Lois J. van der

doi:10.1016/0022-4804(78)90123-3

Cited by 17 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accuracy of thermodilution as a technique for measuring flow has been tested in in uitro models using saline (Jebson and Karkow 1986), distilled water (Pavek et al 1964), tap water (Moodie et al 1978;Norris et al 1986;Powner and Snyder 1978), and blood (Bilfinger, Lin and Anagostopoulos 1982;Jebson and Karkow 1986;MacKenzie et al 1986) as the perfusate under pulsatile (Cropp and Burton 1966;Jebson and Karkow 1986;Powner and Snyder 1978;) or constant (Bilfinger et al 1982;Moodie et al 1978;Norris et al 1986) flow conditions. Thermodilution values were compared to flow measured volumetrically (Cropp and Burton 1966;Forrester et al 1972;MacKenzie et al 1986) or using flow meters (Cropp and Burton 1966;Forrester et al 1972;Jebson and Karkow 1986).…”

Section: Discussionmentioning

confidence: 99%

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

Jarvis

Woliner

Steffey

1992

Journal of Veterinary Anaesthesia

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

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

Jarvis

Woliner

Steffey

1992

Journal of Veterinary Anaesthesia

View full text Add to dashboard Cite

“…This creates a potential for error because (a) the recirculation of indicator before the computed analysis is complete, and (b) loss of thermal indicator may become significant. These sources of error may explain the divergent thermodilution CO results found at low CO. 23 found at CO less than 2 L-min-t thermodilution was not accurate in paediatric patients when compared to the Fick method. However, they assumed an oxygen consumption rather than measuring it.…”

Section: Accuracy In Pathologic Conditionsmentioning

confidence: 73%

Limitations of cardiac output measurements by thermodilution

Nadeau

Noble

1986

Can Anaesth Soc J

View full text Add to dashboard Cite

Cardiac output (CO) can be determined using pulmonary artery catheters and thermodilution techniques. The purpose of this paper is to describe the thermodilution principle and to consider factors and pathology which may invalidate the CO determination. Thermodilution techniqueThe injection of a known amount of indicator (a cool solution) into the right atrium through the proximal port of a pulmonary artery catheter (PAC) is detected distally by a thermistor located 4 cm from the end of the PAC. ~ The change in temperature of blood in pulmonary artery causes a change in the thermistor Wheatstone bridge resistance which allows a computer to calculate the area under the thermodilution curve (Figure (a)). This and the volume of injectate allow computation of CO. 2 The shape of the thermodilution curve is similar to dye dilution curves except thermodilution recirculation is small (about four per cent of the peak of the curve). 3 The thermodilution curve peaks rapidly and then follows an exponential decay, until there is recirculation or delayed cooling from the residual indicator in the PAC. 4 This last portion of the curve should not be used in determining the area under the curve.Cardiac output is determined from the following equation 2 CO = Vt (TB --Ti)KtK2/ATB(t)dt where Vj is the injectate volume, TB is the blood From the

show abstract