Evaluation of a continuous thermodilution cardiac output catheter

M. L. Dollar, M. L. Yelderman, M. D. Quinn, R. C. McKown, R. C. Eberhart, C. R. Rosenfeld

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The authors evaluated a thermodilution catheter designed to continuously measure cardiac output (CO). A 10 cm long surface heating element is positioned in a Swan-Ganz catheter corresponding to a right atrial-ventricular site. Heat is repetitively deposited into flowing blood in a unique, pseudorandom binary form. Small temperature fluctuations are sensed with a high performance thermistor and correlated with the heat input pattern, from which CO is determined. Seven adult sheep were anesthetized and instrumented for both continuous and standard cold bolus injection thermodilution (COM1) flow measurements. Heart rate and blood volume were adjusted to vary CO from 1.5 to 13.2 L/min. Continuous measurements correlated well with triplicate COM1 determinations (S(y,x) = 0.56, r = 0.967) that improved with experience (S(y,x) = 0.38, r = 0.99 for the last three animals). The surface heat transfer coefficient was measured in water (catheter parallel to flow). Results agreed well with a standard cylinder-in-crossflow correlation. The right ventricle heating element surface temperature was predicted for several CO and heating combinations. Worst case results yielded a 5.8°C surface temperature elevation, suggesting that thermally induced damage is unlikely. Results suggest this catheter provides accuracy at least comparable to that of standard cold bolus injection methods, with no heat induced damage to blood.

Original languageEnglish (US)
JournalASAIO Journal
Volume38
Issue number3
StatePublished - 1992

Fingerprint

Cardiac Catheters
Thermodilution
Catheters
Cardiac Output
Hot Temperature
Heating
Electric heating elements
Blood
Temperature
Cardiac Volume
Thermistors
Injections
Flow measurement
Blood Volume
Heat transfer coefficients
Heart Ventricles
Sheep
Animals
Heart Rate
Water

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering

Cite this

Dollar, M. L., Yelderman, M. L., Quinn, M. D., McKown, R. C., Eberhart, R. C., & Rosenfeld, C. R. (1992). Evaluation of a continuous thermodilution cardiac output catheter. ASAIO Journal, 38(3).

Evaluation of a continuous thermodilution cardiac output catheter. / Dollar, M. L.; Yelderman, M. L.; Quinn, M. D.; McKown, R. C.; Eberhart, R. C.; Rosenfeld, C. R.

In: ASAIO Journal, Vol. 38, No. 3, 1992.

Research output: Contribution to journalArticle

Dollar, ML, Yelderman, ML, Quinn, MD, McKown, RC, Eberhart, RC & Rosenfeld, CR 1992, 'Evaluation of a continuous thermodilution cardiac output catheter', ASAIO Journal, vol. 38, no. 3.
Dollar ML, Yelderman ML, Quinn MD, McKown RC, Eberhart RC, Rosenfeld CR. Evaluation of a continuous thermodilution cardiac output catheter. ASAIO Journal. 1992;38(3).
Dollar, M. L. ; Yelderman, M. L. ; Quinn, M. D. ; McKown, R. C. ; Eberhart, R. C. ; Rosenfeld, C. R. / Evaluation of a continuous thermodilution cardiac output catheter. In: ASAIO Journal. 1992 ; Vol. 38, No. 3.
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