Guyatt A R, McBride M J, Meanock C I
Eur J Respir Dis. 1983 Feb;64(2):81-9.
We evaluated the respiratory inductive plethysmograph, (RIP), during tidal breathing in eight men and seven women. This device measures movements of the rib cage and abdomen during breathing and adds the signals to produce an indirect record of ventilation. We recorded on magnetic tape, the rib and abdominal signals separately, with a simultaneous ventilation measurement from a pneumotachograph, and analysed them later using a digital computer. One method of calibration, the simultaneous equation technique, was considered in detail. Agreement between the combined RIP signal and a simultaneous ventilation record was normally within 25% except where the calibration was unsatisfactory or the breathing pattern was irregular. The reproducibility of measurements made 5 min apart was good overall, but some subjects showed marked variability. An alternative calibration method which derives indirect isovolume relationships was also examined, but was found to give very erratic results. The most serious error was the alinearity of the rib and abdominal signals, and the problem of describing thoracic movement using only two sensing elements. We conclude that the RIP is a convenient monitor of ventilation during regular tidal breathing, but that it is not quantitative.
我们对8名男性和7名女性在潮式呼吸期间的呼吸感应体积描记器（RIP）进行了评估。该设备可测量呼吸过程中胸腔和腹部的运动，并将这些信号相加，以间接记录通气情况。我们用磁带分别记录肋骨和腹部的信号，同时用呼吸流速计测量通气情况，之后使用数字计算机对其进行分析。详细考虑了一种校准方法，即联立方程技术。除校准不令人满意或呼吸模式不规则的情况外，RIP组合信号与同时记录的通气情况之间的一致性通常在25%以内。总体而言，间隔5分钟进行的测量重复性良好，但一些受试者表现出明显的变异性。还研究了另一种推导间接等容关系的校准方法，但发现其结果非常不稳定。最严重的误差是肋骨和腹部信号的非线性，以及仅使用两个传感元件来描述胸部运动的问题。我们得出结论，RIP是常规潮式呼吸期间通气情况的便捷监测器，但它不是定量的。
