A newly developed arterial tonometer enabled us to measure the blood pressure waveforms in addition to determining systolic and diastolic pressures noninvasively and continuously. Twenty-eight adult patients undergoing orthopedic surgery under controlled hypotension were studied. Systolic blood pressure was reduced to two-thirds of baseline values with an infusion of nitroglycerin during nitrous oxide/enflurane anesthesia. Intraarterial blood pressures were simultaneously measured in either the right or the left radial artery with a cannula and a Gould P23XL calibrated transducer; tonometric monitoring was performed on the contralateral radial artery using a Colin CBM-3000 instrument. The outputs of the two blood pressure measurement instruments were recorded for later data analysis. The shape of the tonometric pressure waveform was nearly identical to the waveform recorded intraarterially even during controlled hypotension. Regression analyses of 2039 paired tonometric and intraarterial blood pressure values during the hypotensive period showed good correlations (r = 0.78 for systolic, r = 0.81 for mean, and r = 0.70 for diastolic pressures). The accuracy of systolic, mean, and diastolic readings was from 4 to 7 mm Hg with negligible bias and did not differ significantly among six systolic, four mean, and four diastolic pressure groups. Our results indicate that arterial tonometry can provide accurate, reliable, and real-time monitoring of blood pressure even during controlled hypotension.

译文

新开发的动脉眼压计使我们能够测量血压波形,此外还可以无创,连续地确定收缩压和舒张压。研究了28例在控制性低血压下接受骨科手术的成年患者。在一氧化二氮/恩氟烷麻醉期间输注硝酸甘油使收缩压降低至基线值的3分之2。使用套管和Gould P23XL校准的换能器同时测量右或左radial动脉的动脉内血压; 使用Colin CBM-3000仪器对对侧radial动脉进行眼压监测。记录了两种血压测量仪器的输出,以进行以后的数据分析。即使在控制性低血压期间,眼压波形的形状也几乎与动脉内记录的波形相同。2039年在低血压期间成对的眼压和动脉内血压值进行的回归分析显示出良好的相关性 (收缩压r = 0.78,平均值r = 0.81,舒张压r = 0.70)。收缩压,平均值和舒张压读数的准确性为4至7毫米Hg,偏倚可忽略不计,并且在六个收缩压,四个平均值和四个舒张压组中没有显着差异。我们的结果表明,即使在控制性低血压期间,动脉眼压计也可以提供准确,可靠和实时的血压监测。

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