Davidson R N, Hayward L, Pounsford J C, Saunders K B
Q J Med. 1986 Aug;60(232):753-62.
We describe the construction of a simple device which may be used to connect a patient with a tracheostomy to standard lung function testing equipment. We compared the lung function of nine patients after laryngectomy with nine patients matched for similar degrees of airflow obstruction, and found that peak flow rate (as per cent predicted) was significantly lower than predicted FEV1 in the patients with tracheostomy. This suggests that the larynx may normally affect production of peak flow. We then compared the change in resistance over the normal tidal volume in the two groups, finding no significant difference, and obtained similar results from paired studies in two patients before and after laryngectomy. We conclude that, while the laryngeal aperture varies during tidal breathing, it plays no major part in the overall resistance changes which occur during a normal breath.
我们描述了一种简单装置的构造，该装置可用于将气管切开术患者与标准肺功能测试设备相连。我们将9例喉切除术后患者的肺功能与9例气流阻塞程度相似的匹配患者进行了比较，发现气管切开术患者的峰值流速（预测百分比）显著低于预测的第一秒用力呼气容积（FEV1）。这表明喉部通常可能会影响峰值流速的产生。然后我们比较了两组在正常潮气量下阻力的变化，未发现显著差异，并且在两名患者喉切除术前和术后的配对研究中也得到了类似结果。我们得出结论，虽然喉部开口在潮式呼吸期间会发生变化，但它在正常呼吸过程中发生的总体阻力变化中不起主要作用。
