NONINVASIVE MEASUREMENT OF CARDIAC-OUTPUT - WHOLE-BODY IMPEDANCE CARDIOGRAPHY IN SIMULTANEOUS COMPARISON WITH THERMODILUTION AND DIRECT OXYGEN FICK METHODS
T. Koobi et al., NONINVASIVE MEASUREMENT OF CARDIAC-OUTPUT - WHOLE-BODY IMPEDANCE CARDIOGRAPHY IN SIMULTANEOUS COMPARISON WITH THERMODILUTION AND DIRECT OXYGEN FICK METHODS, Intensive care medicine, 23(11), 1997, pp. 1132-1137
Objective: To determine the reliability of whole-body impedance cardio
graphy (ICG(WB)), with electrodes attached to wrists and ankles, in th
e measurement of cardiac output (GO) on the basis of simultaneous comp
arison with thermodilution (TD) and direct oxygen Fick (Fick) methods.
Design: Prospective clinical study. Setting: A surgical intensive car
e unit at a university hospital. Patients: Thirty consecutive subjects
undergoing a coronary artery bypass surgery were investigated preoper
atively. Measurements: ICG(WB) derived CO was measured simultaneously
with the TD and Pick methods to establish the biases and limits of agr
eement (LA) between the methods. Results: The results obtained by ICG,
and the invasive methods showed good agreement. The bias and LA betwe
en COTD and COICG were 0.00 l/min; -1.37 and 1.37 l/ min, respectively
, and were close to those obtained between COTD and COFICK, 0.32 l/min
; 1.74 and -1.10 l/min. The bias and LA between the COFICK and COICG w
ere -0.32 l/min; -2.24 and 1.60 l/min respectively. The repeatability
value of consecutive single measurements for ICG(WB) (RVICG = 0.57 l/m
in) was much better than for the TD method (RVTD = 1.10 l/min). Conclu
sion: There was close agreement between the results of the three metho
ds in the measurement of CO. In sedated preoperative patients the accu
racy of ICG(WB) is within clinically acceptable limits and its repeata
bility is excellent. ICG(WB) provides a useful alternative to the TD a
nd Fick methods in cases where the pressures supplied by the pulmonary
artery catheter are not essential.