| Cardiac Output Measurement Using
the Non-Invasive Cardiac Output (NICO) Monitor: A Comparative
Study with the Standard Thermodilution Technique |
(Second Department of Surgery and Intensive Care
Unit*, Gunma University, School of Medicine, Maebashi, Japan)
| Chieri Kimura |
Fumio Kunimoto* |
Yasuo Morishita |
|
The non-invasive cardiac output
(NICO) monitor is a new device in order to measure cardiac output
(CO). A rebreathing circuit is built in the NICO monitor and
CO is calculated using the Fick CO2 equation. We compared
this technique with the standard thermodilution (TDCO) technique
in patients with thoracic and abdominal surgery. Thirty-two paired
data were obtained in 17 patients. Correlation between the two
methods in patients with controlled mechanical ventilation (CMV)
was fair, with a correlation coefficient of 0.85. However, the
correlation coefficient of the two methods was 0.60 in spontaneous
breathing patients. Bland-Altman analysis showed a bias of 0.24±0.68
(mean±2SD) in CMV patients and 1.44±1.28 in spontaneous breathing
patients. The NICO value was inversely proportional to an end-tidal
CO2 difference (ΔETCO2)
between pre-rebreathing and post-rebreathing. The large bias
in spontaneously breathing patients might be due to a small ΔETCO2 in spontaneously breathing
patients. The NICO monitor has a tendency to measure higher CO
values in spontaneously breathing patients.
Jpn. J. Cardiovasc. Surg. 33: 6 -8 (2004) |
|
