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유철규(Chul Gyu Yoo),이상도(Sang Do Lee),권오정(O Jung Kwon),이춘택(Choon Taek Lee),한성구(Sung Koo Han),심영수(Young Soo Shim),김건열(Keun Youl Kim),한용철(Yong Chol Han) 대한내과학회 1989 대한내과학회지 Vol.37 No.4
N/A The presence of measurable reversibility in airflow obstruction gives us information about the diagnosis, plan of treatment, and prognosis. Many investigators have studied the physiologic responses of normal, bronchitic, and asthmatic subjects to inhaled bronchodilator drugs. Nevertheless, there is stil considerable debate as to which parameter of the pulmonary function test is optimal for assessing bronchodilation, To evaluate the role of airway resistance in the assessment of the reversibility of airway obstruction, the response to inhaled fenoterol was measured in 39 patients with obstructive airway disease. Spirometry and body plethysmography were performed before and 10minutes after inhalation of fenoterol. A clinically significant improvement after bronchodilator inhalation was defined as an improvement of greater than 15% of initial FVC or FEV1.25% of FEF25-75%, 30% of SRaw, or 50% of SGaw. The results were as follows: 1) The largest percent change of the initial value was by SGaw criteria (60.33%), followed by SRaw (33,63%), MEF50 (22,51%), FEF 5-75g (21.62%), FEUI (13,83%), PEFR (13,81%.), FVC (8.60%), and FEVI/FVC criteria (5.70%) in the order of amount of change. 2) The greatest positive response rate was by SRaw or SGaw criteria (61.5%), followed by FEV1 (46.2%), FEF25-75% (41.0%), B11d FVC (15.4%) criteria. 3) There was a significant improvement in SRaw but not in FEV1 on 12 occasion (30.8%), an improvement in FEV1 but not in SRaw on 6 occasions (15.4%), and an improvement in SRaw or FEV1 on 30 occasions (76.9%). From the above findngs, it is concluded that SRaw is a more sensitive indicator for the assessment of reversibility of airflow obstruction than FEU1. The combination of FEVl and SRaw identifies more cases of reversible airflow obstruction.