連続心拍出量測定装置NICOの心臓手術時の精度の検討

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  • Clinical Evaluation of a Non-invasive Cardiac Output NICO Monitor during Cardiac Surgery.

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The Non-invasive Cardiac Output (NICO) monitor (Novametrix medical Systems Inc., Wallingford, CT, U.S.A.) utilizes a minimally-invasive partial CO2 rebreathing method to determine cardiac output by means of a differential form of the Fick equation. We evaluated the NICO monitor by comparing its output (NCO) with those obtained by bolus thermodilution (TCO) and continuous thermodilution (CCO) using a Baxter Vigilancemonitor (Baxter Healthcare Corporation, Irvine, CA). Seven patients undergoing cardiovascular surgery were included in this study. A total of 53 comparisons were made with TCO ranging from 3.4 to 13.2l•min-1. Regression analysis between NCO and TCO gives a correlation of r=0.783 with a slope of 0.72 and an offset of 1.16l•min-1. The linear regression coefficient between CCO and TCO was 0.909 with a slope of 0.88 and an offset of 0.30l•min-1. Bland-Altman analysis between NCO and TCO resulted in a bias of -0.65l•min-1 with precision of 1.48l•min-1. The bias and precision between CCO and TCO was -0.42±0.97l•min-1.

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