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对167名健康不吸烟者、67例慢性支气管炎患者及23例肺限制性疾病患者,依据最大呼气流量-容积曲线分别测算在肺活量75％～50％、50％～25％、25％～残气位的最大呼气流量平均斜率(分别称MTC_1、MTC_2、MTC_3)及MTC_1/MTC_3(MTC_R)。综观各测定值,能精确、定量地反映最大呼气流量-容积曲线的形态,并能用于阻塞性与限制性肺疾病的鉴别。但MTC在检测小气道病变的敏感性优于传统的用力呼气流量指标,尤以MTC_R较为实用。
In 167 healthy non-smokers, 67 patients with chronic bronchitis and 23 patients with pulmonary restriction disease, the vital capacity of 75% -50%, 50% -25%, 25% The average maximum expiratory flow rate of residual gas (referred to as MTC_1, MTC_2, MTC_3, respectively) and MTC_1 / MTC_3 (MTC_R). Looking at each measured value can accurately and quantitatively reflect the shape of the maximum expiratory flow volume curve, and can be used for the identification of obstructive and restrictive lung diseases. However, the sensitivity of MTC in the detection of small airway lesions is superior to the traditional forced expiratory flow index, especially MTC_R is more practical.