Golden J C, Miles D S
Phys Ther. 1986 Oct;66(10):1544-7. doi: 10.1093/ptj/66.10.1544.
Impedance plethysmography (IPG) is a safe, noninvasive method for measuring peripheral hemodynamics. The purpose of this article is to describe the IPG technique and its potential use by physical therapists in making hemodynamic evaluations. Impedance plethysmography requires the attachment of four circumferential Mylar band electrodes around a limb. We use a cardiograph to introduce a 4-mA current (I) at a frequency of 100 kHz in the two outer electrodes. The voltage (V) is sensed in the two center electrodes, and the resulting impedance (Z) is calculated using Ohm's law (Z = V/I). Arterial blood flow can be calculated using an impedance-related volume conduction equation. Impedance plethysmography has been shown to be economical, and any limb or limb segment can be evaluated. Applications are presented for the assessment of arterial blood flow, peripheral arterial disease, deep vein thrombosis, and venous insufficiency. Impedance plethysmography offers the physical therapist a safe and relatively simple technique to assess the peripheral vascular status of the patient.
阻抗容积描记法（IPG）是一种用于测量外周血流动力学的安全、无创方法。本文旨在描述IPG技术及其在物理治疗师进行血流动力学评估中的潜在应用。阻抗容积描记法需要在肢体周围附着四个环形聚酯薄膜带电极。我们使用心电图仪在两个外部电极处以100 kHz的频率引入4 mA电流（I）。在两个中心电极中感测电压（V），并使用欧姆定律（Z = V/I）计算所得阻抗（Z）。动脉血流量可以使用与阻抗相关的容积传导方程来计算。阻抗容积描记法已被证明经济实惠，并且可以评估任何肢体或肢体节段。本文介绍了阻抗容积描记法在评估动脉血流量、外周动脉疾病、深静脉血栓形成和静脉功能不全方面的应用。阻抗容积描记法为物理治疗师提供了一种安全且相对简单的技术，用于评估患者的外周血管状况。
