[Cardiac output determination by thermodilution and arterial pulse waveform analysis in patients undergoing aortic valve replacement].
OBJECTIVE
To compare the accuracy of cardiac output (CO) measurement by arterial pulse waveform analysis (CO(PW)) to thermodilution assessments in patients with aortic stenosis, a high-risk patient group who may benefit from extended hemodynamic monitoring.


METHODS
In 30 patients with aortic stenosis, CO was assessed in triplicate by thermodilution via pulmonary artery catheterization (CO(PAC)), and by arterial pulse waveform analysis (CO(PW)), before and after valve replacement. The techniques were compared by assessing the repeatability coefficient of each method and by calculating the percentage error, bias, and the limits of agreement between methods.


RESULTS
The repeatability coefficients of CO(PAC) and CO(PW) were 0.89 L.min(-1) and 1.04 L.min(-1) respectively after induction of anesthesia, which corresponded to 24% of CO(PAC) and 26% of CO(PW), and increased to 33% of CO(PAC) and 32% of CO(PW) immediately after extracorporeal circulation. A systematic error between methods was not observed. The limits of agreement were bias +/- 1.42 L.min(-1) after anesthesia induction, corresponding to a 36% percentage error. The scattering of differences between methods increased markedly after termination of extracorporeal circulation (percentage error 56%).


CONCLUSIONS
The repeatability of CO(PAC), as well as of CO(PW), is reduced in patients with aortic stenosis. The repeatability of both methods, as well as the agreement between methods, decreased markedly immediately after termination of cardiopulmonary bypass.
Staier
Klaus
K
Department of Anesthesiology, Heart Centre Bad Krozingen, Suedring 15, 79189 Bad Krozingen, Germany.
Wiesenack
Christoph
C
Günkel
Ludwig
L
Keyl
Cornelius
C
D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000601:surgery*; D001024:Aortic Valve Stenosis / Q000601:surgery; D001794:Blood Pressure; D002302:Cardiac Output; D002315:Cardiopulmonary Bypass; D002404:Catheterization / Q000379:methods; D005112:Extracorporeal Circulation; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods* / Q000706:statistics & numerical data*; D011651:Pulmonary Artery / Q000503:physiopathology; D011674:Pulse / Q000379:methods* / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012307:Risk Factors; D013815:Thermodilution / Q000379:methods / Q000706:statistics & numerical data