Banovcin P, Seidenberg J, von der Hardt H
Dept of Pediatrics, Jesenius Medical Faculty, Martin, Slovakia.
Eur Respir J. 1995 Jan;8(1):167-71. doi: 10.1183/09031936.95.08010167.
Noncalibrated respiratory inductance plethysmography has been used to measure respiratory function by calculation of the phase angle and, more recently, by determination of the ratio of each time to reach peak tidal expiratory flow to total expiratory time (TPEF/TE). Since TPEF/TE is known to be decreased in airway obstruction when derived from flow signals obtained by a pneumotachograph, we wanted to develop an alternative method to measure rib cage and abdominal respiratory movements. For this purpose, we used two pressure sensors attached to the skin above the umbilicus and in the right medioclavicular line at the fourth intercostal space: "pressure sensor plethysmography". We tested the ability of this method to assess thoracoabdominal asynchrony and TPEF/TE by comparison with respiratory inductance plethysmographic and pneumotachographic measurements in 30 children, aged 1-12 yrs, with airway obstruction. The mean difference (95% confidence interval (95% CI)) between phase angles obtained by respiratory inductance plethysmography and pressure sensor plethysmography was only -5.8 degrees (range -18.0 to +6.4 degrees). Similarly, all methods used to measure TPEF/TE agreed well: mean differences (95% CI) between pneumotachographic and respiratory inductance plethysmographic, pneumotachographic and pressure sensor plethysmographic, and respiratory inductance plethysmographic and pressure sensor plethysmographic measurements of TPEF/TE were +0.01 (range -0.05 to +0.06), -0.03 (-0.09 to +0.03) and -0.03 (-0.10 to +0.04), respectively. We conclude that pressure sensor plethysmography is a simple and noninvasive method, and suitable to measure thoracoabdominal asynchrony and TPEF/TE ratios as well as respiratory inductance plethysmography and pneumotachography.
未校准的呼吸感应体积描记法已被用于通过计算相角来测量呼吸功能，最近则是通过确定每次达到呼气潮气量峰值的时间与总呼气时间的比值（TPEF/TE）来进行测量。由于已知当从呼吸流速仪获得的流量信号中得出TPEF/TE时，其在气道阻塞时会降低，我们想要开发一种替代方法来测量胸廓和腹部的呼吸运动。为此，我们使用了两个压力传感器，分别附着在脐上方的皮肤以及第四肋间右锁骨中线处：“压力传感器体积描记法”。我们通过与呼吸感应体积描记法和呼吸流速仪测量结果进行比较，测试了该方法评估胸腹部不同步和TPEF/TE的能力，研究对象为30名年龄在1至12岁的气道阻塞儿童。呼吸感应体积描记法和压力传感器体积描记法所获得的相角之间的平均差值（95%置信区间（95%CI））仅为-5.8度（范围为-18.0至+6.4度）。同样，所有用于测量TPEF/TE的方法结果都很一致：呼吸流速仪与呼吸感应体积描记法、呼吸流速仪与压力传感器体积描记法以及呼吸感应体积描记法与压力传感器体积描记法测量TPEF/TE的平均差值（95%CI）分别为+0.01（范围为-0.05至+0.06）、-0.03（-0.09至+0.03）和-0.03（-0.10至+0.04）。我们得出结论，压力传感器体积描记法是一种简单且无创的方法，适用于测量胸腹部不同步和TPEF/TE比值，与呼吸感应体积描记法和呼吸流速仪一样适用。
