Robinson P S, Crowther A, Jenkins B S, Webb-Peploe M M, Coltart D J
Cardiovasc Res. 1979 Jul;13(7):420-6. doi: 10.1093/cvr/13.7.420.
This study assesses a precalibrated dichromatic earpiece densitometer and microprocessor for the measurement of cardiac output by indocyanine green dye dilution. The measured cardiac output is compared with values of cardiac output simultaneously determined using a cuvette densitometer. The microprocessor computation of cardiac output agreed very closely with the cardiac output determined by manual calculation from the same dye dilution curves (standard deviation +/- 1.47%). The reproducibility of the earpiece densitometer (standard deviation +/- 5.2%) was virtually identical to that of the cuvette densitometer (+/- 5.3%). In a comparison of earpiece and cuvette densitometers for 60 measurements of cardiac output following pulmonary arterial injection of dye and for 50 measurements following femoral venous injection of dye, correlation coefficients were 0.83 and 0.78 and the standard deviations of the differences of simultaneous measurements were 7.2% and 8.3% respectively. The instrument offers an accurate reproducible and relatively noninvasive technique for measuring cardiac output.
本研究评估了一种预先校准的双色耳片密度计和微处理器，用于通过吲哚菁绿染料稀释法测量心输出量。将测量的心输出量与使用比色皿密度计同时测定的心输出量值进行比较。微处理器计算的心输出量与通过对相同染料稀释曲线进行手动计算确定的心输出量非常接近（标准差±1.47%）。耳片密度计的重现性（标准差±5.2%）与比色皿密度计的重现性（±5.3%）几乎相同。在比较耳片密度计和比色皿密度计在肺动脉注射染料后进行60次心输出量测量以及股静脉注射染料后进行50次测量时，相关系数分别为0.83和0.78，同时测量差异的标准差分别为7.2%和8.3%。该仪器为测量心输出量提供了一种准确、可重现且相对无创的技术。
