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[Correlation between end-tidal carbon dioxide levels and cardiac output during cardiac surgery with cardiopulmonary bypass.].

Abstract：

BACKGROUND AND OBJECTIVES:End-tidal carbon dioxide (P ET CO2) not only reflects pulmonary ventilation but also carbon dioxide production (metabolism) and pulmonary blood supply (circulation). During constant metabolism and ventilation, P ET CO2 reflects pulmonary blood perfusion, thus cardiac output (CO). This study aimed at evaluating the correlation between P ET CO2 levels and CO during cardiac surgery with cardiopulmonary bypass (CPB). METHODS:Participated in this study 25 patients submitted to coronary artery bypass grafting (CABG) with CPB. End-tidal CO2 monitoring started after tracheal intubation. Cardiac output was determined by thermodilution with pulmonary artery catheter (Swan-Ganz). Carbon dioxide partial blood pressure (PaCO2) was obtained with arterial blood gases analysis. Studied parameters were evaluated in the following moments: immediately after general anesthesia induction, before cardiopulmonary bypass, at cardiopulmonary bypass completion and at surgery completion. RESULTS:Statistical analysis has not shown correlation between P ET CO2 and CO2, or between P ET CO2-PaCO2 gradient (Ga-eCO2) and CO. There has been correlation between P ET CO2, Ga-eCO2 and CO values variation as compared to baseline values before CPB, with loss of correlation after CPB until surgery completion. CONCLUSIONS:In this study, where patients submitted to cardiac surgery with CPB were evaluated, ventilation/perfusion changes throughout the procedure might have been the factors determining decreased correlation between cardiac output and end tidal CO2.

journal_name

Rev Bras Anestesiol

journal_title

Revista brasileira de anestesiologia

authors

Miyaji KT,Buscati RI,Rodriguez AJ,Machado LB,Malbouisson LM,Carmona MJ

doi

10.1590/s0034-70942004000500002

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

625-33

issue

5

eissn

0034-7094

issn

1806-907X

pii

S0034-70942004000500002

journal_volume

54

pub_type

杂志文章

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