Risk factors for hemoptysis in Mycobacterium avium complex lung disease.

Abstract Background Hemoptysis is a frequent and sometimes fatal complication of non-tuberculous mycobacterial (NTM) lung disease. The risk factors for hemoptysis are not well understood. In the current study, potential risk factors for hemoptysis were investigated in patients with Mycobacterium avium complex (MAC) lung disease, which is the most common NTM in Japan. Methods Medical records from the Kinki-Chuo Chest Medical Center were reviewed. Consecutive patients with MAC lung disease diagnosed in 2014 and followed up for more than 1 year in the hospital were included in the study. Hemoptysis was confirmed between 2014 and 2016. The characteristics of patients with hemoptysis and non-hemoptysis at the time of the initial diagnosis of MAC lung disease were obtained from the medical records, and the two groups were compared. The radiological findings assessed included nodules, infiltration shadows, cavities, and bronchiectasis. Each was classified and scored individually in six lung fields, and these data were used to generate radiological scores. Results The study included 82 patients with MAC lung disease, 18 with hemoptysis and 64 without. Higher total radiological severity score at the time of the initial diagnosis of MAC was associated with an increased risk of hemoptysis. Among the radiological scores, infiltration and cavities were marginally associated with the risk of hemoptysis. Conclusions The radiological severity score at the time of initial diagnosis of MAC lung disease was associated with hemoptysis.