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(Chest. 2006;129:1142-1147.)
© 2006 American College of Chest Physicians

Causes and Clinical Features of Subacute Cough*

Nam-Hee Kwon, MD; Mi-Jung Oh, MD; Tae-Hoon Min, MD; Byung-Jae Lee, MD, PhD and Dong-Chull Choi, MD, PhD

* From the Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

Correspondence to: Dong-Chull Choi, MD, PhD, Associate Professor, Division of Allergy, Department of Medicine, Samsung Medical Center, 50 Ilwon-dong, Kangnam-Gu, Seoul, Korea 135–710; e-mail: dcchoi{at}smc.samsung.co.kr

Abstract

Study objectives: Cough lasting > 3 weeks has been defined as chronic cough. However, it might be more persuasive to divide cough into subacute, lasting 3 to 8 weeks, and chronic, lasting > 8 weeks. We evaluated the causes and clinical courses of subacute cough, and the value of the bronchoprovocation test and induced sputum examination (IS).

Methods: Nonsmoking patients with cough of 3 to 8 weeks duration were enrolled into the study. Patients with dyspnea, basal FEV1 of < 70% predicted, abnormal findings on a plain chest radiograph or physical examination were excluded. We prescribed an antihistamine-decongestant for patients who were suspected to have postinfectious cough or postnasal drip. If patients had positive results on a bronchoprovocation test or IS, therapy with inhaled corticosteroids was substituted according to an algorithmic approach.

Results: One hundred eighty-four patients (77 men and 107 women) were evaluated; the mean age of the study group was 47.5 years. Eighty-nine of 184 patients had postinfectious cough. Cough resolved without treatment in 62 patients. Twenty-nine of 43 patients with positive bronchoprovocation test results had cough-variant asthma.

Conclusions: Postinfectious cough was the most common cause of subacute cough. The spontaneous resolution of cough was frequent in patients with subacute cough. Unless asthma was strongly suspected, the performance of the bronchoprovocation test could be delayed until after empirical treatment had been administered.

Key Words: cough • diagnosis • treatment




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