摘要
磁膈神经刺激时的口压(Pmo,tw)和嗅鼻吸气压力(SNIP)最近被提出作为评估吸气肌力量的替代无创方法。本研究旨在比较其与正常受试者最大吸气压力(MIP)的重现性。对10名健康人进行了半卧位功能剩余容量测定。颈磁膈神经刺激是在温和呼气期间进行的闭塞合并一个小泄漏。通过记录膈肌电来控制刺激的恒常性。研究了Pmo、tw、SNIP和MIP的session内和session间压力重现性。研究对象在1天和1个月后重复10个动作。Pmo、tw、SNIP和MIP的平均值分别为16 cmH2O、118 cmH2O和115 cmH2O。在三个检验中,受试者内变异相对于受试者间变异较小,Pmo、tw、SNIP和MIP的类内相关系数分别为0.79-0.90、0.85-0.92和0.88-0.92。每隔1天,Pmo、tw、SNIP和MIP的重复性系数(2 SD的差异)分别为3.6 cmH2O、32 cmH2O和28 cmH2O。 At 1 month interval, the coefficient of repeatability was 5.8 cmH2O for Pmo,tw, 23 cmH2O for SNIP and 21 cmH2O for MIP. We conclude that the within session reproducibility of the new tests twitch mouth pressure and sniff nasal inspiratory pressure is sufficient to be clinically useful. For sniff nasal inspiratory pressure, the between session reproducibility established after 1 day was maintained after 1 month. For twitch mouth pressure, the between session reproducibility declined slightly after 1 month. These characteristics should be considered when using these methods to follow an individual patient over time.