Hudgel D W, Capehart M, Johnson B, Hill P, Robertson D
J Appl Physiol Respir Environ Exerc Physiol. 1984 Jun;56(6):1659-65. doi: 10.1152/jappl.1984.56.6.1659.
We analyzed the accuracy of the inductance vest in measuring several ventilatory parameters in five patients with chronic obstructive pulmonary disease (COPD). We assessed tidal volume (VT) accuracy at different respiratory frequencies in different lying body positions with different thoracic and abdominal contributions to breathing and the accuracy over a 4-h time span. Mean percent error was calculated without regard to direction of error. The mean error of vest VT estimation was 7.6% for all body positions studied and 5.6% for right and left lateral positions combined. Vest VT accuracy was unchanged after 4 h and with changes in thoracic and abdominal contributions to VT. The mean errors for inspiratory and expiratory times were 3.3 and 2.0%, respectively. Volume was differentiated to flow. For respiratory rates ranging from 12 to 30 breaths/min, the mean error of the vest and our differentiation circuit in duplicating peak flows measured at the mouth was 3.5%. The ability of the vest to estimate changes in end-expiratory position or functional residual capacity was not as good as with VT; the mean error was 30.7%. For estimation of VT, ventilatory timing, and airflow in COPD patients, the inductance vest performs well. For measurement of changes in lung volume, improvements in vest design need to be made.
我们分析了感应背心在测量5例慢性阻塞性肺疾病（COPD）患者的多个通气参数时的准确性。我们评估了在不同的呼吸频率、不同的卧位身体姿势下，胸廓和腹部对呼吸的不同贡献时潮气量（VT）的准确性，以及在4小时时间段内的准确性。计算平均百分比误差时不考虑误差方向。在所研究的所有身体姿势下，背心VT估计的平均误差为7.6%，右侧和左侧卧位相结合时为5.6%。4小时后以及胸廓和腹部对VT的贡献发生变化时，背心VT的准确性没有改变。吸气时间和呼气时间的平均误差分别为3.3%和2.0%。体积被微分以得到流量。对于12至30次呼吸/分钟的呼吸频率，背心和我们的微分电路在复制口腔测量的峰值流量时的平均误差为3.5%。背心估计呼气末位置或功能残气量变化的能力不如估计VT时好；平均误差为30.7%。对于COPD患者的VT、通气时间和气流估计，感应背心表现良好。对于肺容积变化的测量，背心设计需要改进。
