Carry P Y, Baconnier P, Eberhard A, Cotte P, Benchetrit G
Faculté de Médecine de Grenoble, PRETA-TIMC/IMAG, La Tronche, France.
Chest. 1997 Apr;111(4):910-5. doi: 10.1378/chest.111.4.910.
To assess the accuracy of respiratory inductive plethysmography (RIP) waveforms to those obtained with whole body plethysmograph (BP) as this device gives a plethysmographic signal and a pneumotachograph (PNT).
Randomized controlled trial.
Physiologic laboratory in a university hospital.
Eleven subjects from the laboratory staff.
This study was achieved during four consecutive periods in subjects breathing spontaneously and through different added resistive loads. Using the least square method calibration, two RIP waveforms, VRIP.BP(t) and VRIP.PNT(t), were simultaneously calculated with coefficients obtained from BP and from PNT volume waveforms, respectively VBP(t) and VPNT(t). For each recording, to compare volume waveforms, we calculated their differences in term of distances, DRIP-BP and DRIP-PNT, between the normalized RIP volume signal (respectively, VRIP.BP[t] and VRIP.PNT[t]) and its normalized reference (respectively, VBP[t] and VPNT[t]). We also calculated the distance DPNT-BP between the two normalized references VBP(t) and VPNT(t).
No significant effect of load or time on the distance occurred. Including all the recordings, the mean distance DRIP-BP (3.4+/-1.1%) appears significantly lower than both the mean distance DRIP-PNT (4.5+/-1.3%; p<0.04) and the mean distance DPNT-BP (4.6+/-0.9%; p<0.008). For each period or load level, DRIP-BP appears to be lower than DRIP-PNT and DPNT-BP.
The RIP seems reasonably accurate for analysis of respiratory waveform while subjects subsequently breathe against resistive loads.
评估呼吸感应体积描记法（RIP）波形与全身体积描记器（BP）所获波形的准确性，因为该设备可给出体积描记信号和呼吸流速仪（PNT）信号。
随机对照试验。
大学医院的生理实验室。
实验室工作人员中的11名受试者。
本研究在受试者连续四个阶段进行，期间受试者自主呼吸并通过不同的附加阻力负荷。采用最小二乘法校准，分别根据BP和PNT体积波形VBP(t)和VPNT(t)获得的系数，同时计算两个RIP波形VRIP.BP(t)和VRIP.PNT(t)。对于每次记录，为比较体积波形，我们计算了归一化RIP体积信号（分别为VRIP.BP[t]和VRIP.PNT[t]）与其归一化参考值（分别为VBP[t]和VPNT[t]）之间的距离差异DRIP - BP和DRIP - PNT。我们还计算了两个归一化参考值VBP(t)和VPNT(t)之间的距离DPNT - BP。
负荷或时间对距离无显著影响。纳入所有记录后，平均距离DRIP - BP（3.4±1.1%）明显低于平均距离DRIP - PNT（4.5±1.3%；p<0.04）和平均距离DPNT - BP（4.6±0.9%；p<0.008）。对于每个阶段或负荷水平，DRIP - BP似乎都低于DRIP - PNT和DPNT - BP。
当受试者随后对抗阻力负荷呼吸时，RIP对于呼吸波形分析似乎具有合理的准确性。
