Rasmussen J P, Eriksen J, Andersen J
Acta Anaesthesiol Scand. 1977;21(4):342-5. doi: 10.1111/j.1399-6576.1977.tb01229.x.
In three anesthetized markedly obese patients, non-invasive stroke volumes (the transthoracic electrical impedance method) were compared to simultaneously obtained invasively measured stroke volumes (dye-dilution method). Close correlations were obtained (r = 0.90--0.98) between the two methods, although constant lower impedance stroke volumes were found in these patients when the values usually employed for the electrical resistivity of the blood (zeta) were used for calculation of the impedance stroke volume. No statistically significant difference (P greater than 0.10) between the two methods was found when a zeta of 175 ohm X cm was used for the calculations, or when the percentage changes in stroke volumes were analyzed. The impedance method is safe and reliable; it also permits non-invasive measurements of stroke volume during anesthesia in markedly obese patients.
在三名接受麻醉的极度肥胖患者中，将无创每搏输出量（经胸电阻抗法）与同时通过有创测量获得的每搏输出量（染料稀释法）进行了比较。两种方法之间获得了密切的相关性（r = 0.90 - 0.98），尽管当使用通常用于血液电阻率（ζ）的值来计算电阻抗每搏输出量时，在这些患者中发现电阻抗每搏输出量始终较低。当使用175欧姆×厘米的ζ进行计算时，或者在分析每搏输出量的百分比变化时，两种方法之间未发现统计学上的显著差异（P大于0.10）。电阻抗法安全可靠；它还允许在极度肥胖患者麻醉期间进行无创每搏输出量测量。
