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一般认为最大呼气中期流速(MMEF)是一种确定早期气道阻塞的较敏感的方法。它最大的作用就是诊断和监护轻、中度阻塞性肺疾患,对监护重症疾患的病程则价值不大。所以用最大呼气中期流速的减少来分辨病情进展程度是困难的。本文作者检查了第一秒时间肺活量占最大肺活量的百分数(FEV_1/FVC×100),认为这对观察重度疾患的病程改变较为敏感。据患者第一次来诊时FEV_1/FVC×100的结果不同,把256例患者分成3组观察3～5年以上,第一组其值在60%以上,第三组在40%以下。计算每例患者的每年减少率。
It is generally accepted that the maximum expiratory flow rate (MMEF) is a more sensitive method of determining early airway obstruction. Its greatest role is to diagnose and monitor light and moderate obstructive pulmonary disease, the duration of monitoring intensive care disease is of little value. So with the maximum expiratory mid-term flow rate reduction to distinguish the extent of the progress of the disease is difficult. The authors examined the percentage of maximal vital capacity (FEV 1 / FVC × 100) for the first second and considered this to be more susceptible to the observation of course changes in severe conditions. According to the results of FEV_1 / FVC × 100 when patients first visit, 256 patients were divided into 3 groups and observed for 3 to 5 years. The first group had a value above 60% and the third group below 40%. Calculate the annual rate of decrease for each patient.