Authors obtained the following results through the clinical study on 129 cases of dyspneic patients, admitted through the Emergency Room of Pusan National University Hospital from January 1984 to June 1985. 1) The study group was 129 patients with dyspnea, male 81 caaes(62.8%) and female 48 cases(37.2%). Male to female ratio was 1.7:l. 2) Underlying diseases were pulmonary diseases in 61 cases(47,3%), cardiovascular diseases in 56 cases(43.4%). 3) The most frequently associated symptoms with dyspnea were coughing in pulmonary diseases and chest pain in cardiovascular diseases. 4) Respiratory rate was much more markedly increased in cardiovascular diseases than in pulmonary diseases. 5) Abnormal breathing sound was noted in 85 eases(65.9%), and arrythmia and cardiac murmur were noted in 8 cases(6.2%) at auscultation. 6) Mental status was alert in most of the cases(80.6%). 7) Pulmonary function test revealed the more marked impairment in pulmonary diseases, and there were more significant differences in FEV and FEF25 ~75%.