Is transcutaneous oxygen tension independent of variations in blood flow and in arterial blood pressure?

Biotelemetry and patient monitoring Pub Date : 1982-01-01
J H Eickhoff, E Jacobsen
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Abstract

Whether transcutaneous oxygen tension (TcPO2) is independent of minor variations in perfusion under the TcPO2 electrode, as is claimed, was studied in 18 feet of 16 young healthy adults. The TcPO2 electrode was mounted on the dorsum of the foot and operated at 43 degrees C, while the blood pressure was changed by elevating and lowering the foot. During elevation the mean arterial blood pressure decreased corresponding to the hydrostatic pressure of the column of blood between the heart and the position of the foot. In every experiment TcPO2 decreased when the foot was elevated at an average rate of 1.2% per millimeter Hg change in mean arterial blood pressure. TcPO2 was negatively correlated to blood flow in normal unheated tissue, but significantly and positively correlated to blood flow in the heated, vasodilated tissue under the TcPO2 electrode. In the heated tissue normal blood flow regulation was abolished, and the perfusion under the electrode was mainly determined by the arterial blood pressure. It is concluded that TcPO2 in adults--and probably also in neonates--is affected by the minor or large variations in the perfusion under the electrode caused by fluctuations in arterial blood pressure.

经皮氧张力是否独立于血流和动脉血压的变化?
经皮氧张力(TcPO2)是否独立于TcPO2电极下灌注的微小变化,正如所声称的那样,在18英尺的16名年轻健康成年人中进行了研究。将TcPO2电极安装在足背,在43℃下操作,同时通过抬高和降低足部来改变血压。在抬高期间,平均动脉血压下降,与心脏和脚之间的血液柱的静水压力相对应。在每个实验中,当脚部以平均动脉血压每毫米汞柱变化1.2%的平均速率升高时,TcPO2就会下降。TcPO2与正常未加热组织的血流量呈负相关,而与TcPO2电极下加热血管扩张组织的血流量呈显著正相关。在加热组织中,正常的血流调节被取消,电极下的灌注主要由动脉血压决定。结论是,成人(可能也包括新生儿)的TcPO2受到由动脉血压波动引起的电极下灌注的或大或小的变化的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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