Abstract
OBJECTIVES: Diffuse panbronchiolitis (DPB) is a chronic airway inflammation with low specificity and its diagnosis is often missed or delayed. This study aims to summarize the clinical characteristics and treatment of DPB in order to improve the understanding and diagnosis of the disease. METHODS: The clinical data of 32 DPB patients were collected, analyzed and summarized from March 1, 2013 to March 1, 2022 in the Second Xiangya Hospital of Central South University. The basic information, clinical manifestations, laboratory tests, pulmonary function, imaging tests, treatment, and regression of patients were analyzed. RESULTS: A total of 32 patients were enrolled in the final analysis, with a male-to-female ratio at 1.67. The median age at symptom onset was 26.5 (11.0-69.0) years, and the median age of diagnosis was 47.5 (16.0-77.0) years. All patients presented with chronic cough and copious sputum production. A total of 26 patients had post activity shortness of breath and 14 patients had a positive result (blood cold agglutination test titer≥1꞉64). Pulmonary function examination was performed in 31 patients, 18 patients showed mixed pulmonary ventilation dysfunction, 12 patients showed obstructive pulmonary ventilation, and 1 patient had normal pulmonary ventilation function. A total of 31 patients had a bilateral, diffuse, small nodule pattern on chest CT. All patients were treated with macrolides. A total of 31 patients showed improvement, and 20 patients showed improvement in partial pressure of oxygen and blood oxygen saturation compared with before at discharge. A total of 12 patients were re-examined by chest CT after completing macrolides treatment, 6 cases showed less diffuse nodules, 5 cases showed no significant changes, and 1 case showed more diffuse nodules, which indicated the disease progression. Seven patients received pulmonary function tests after completing macrolides treatment, forced expiratory volume in one second (FEV(1)) and FEV(1)/forced vital capacitywere improved, but forced expiratory flow at 25% of vital capacity did not change significantly. CONCLUSIONS: The clinical manifestations of DPB are nonspecific. Early diagnosis and treatment are very important for the prognosis of patients.