Koulouris N, Mulvey D A, Laroche C M, Green M, Moxham J
Respiratory Muscle Laboratory, Brompton Hospital, London, UK.
Eur Respir J. 1988 Oct;1(9):863-7.
We investigated the effect of mouthpiece design on maximum static expiratory (PEmax) and inspiratory (PImax) mouth pressures. We measured PEmax from total lung capacity (TLC) and PImax from residual volume (RV) in 21 healthy volunteers, and in 40 patients referred for respiratory muscle testing. We compared two different mouthpieces, a semi-rigid plastic flanged type fitting inside the lips, and a 4 cm diameter rubber tube held against the lips. The tube mouthpiece gave significantly higher values for PEmax (p less than 0.02) in all subjects. PImax was also significantly higher (p less than 0.005) with the tube mouthpiece in subjects who recorded normal pressures. We conclude that maximum pressures are obtained in all normal subjects with the rubber tube mouthpiece, and that differences in quoted normal ranges of maximum static respiratory pressures reflect in part the design of the mouthpiece and the way in which it was used.
我们研究了咬嘴设计对最大静态呼气（PEmax）和吸气（PImax）口腔压力的影响。我们在21名健康志愿者以及40名因呼吸肌测试前来就诊的患者中，测量了从肺总量（TLC）得出的PEmax以及从残气量（RV）得出的PImax。我们比较了两种不同的咬嘴，一种是适合置于嘴唇内侧的半刚性塑料带法兰型咬嘴，另一种是抵在嘴唇上的直径4厘米的橡胶管咬嘴。在所有受试者中，橡胶管咬嘴得出的PEmax值显著更高（p小于0.02）。在记录的压力正常的受试者中，橡胶管咬嘴的PImax也显著更高（p小于0.005）。我们得出结论，使用橡胶管咬嘴可在所有正常受试者中获得最大压力，并且引用的最大静态呼吸压力正常范围的差异部分反映了咬嘴的设计及其使用方式。
