Distance-saturation product of the 6-minute walk test predicts mortality of patients with non-cystic fibrosis bronchiectasis

Non-cystic fibrosis (non-CF) bronchiectasis is a chronic progressive pulmonary disease characterized by airway inflammation and infection (1). Pulmonary function and high-resolution computed tomography (HRCT) are used to evaluate the severity of non-CF bronchiectasis (2-4). However, pulmonary spirometry and radiological interpretation are insufficient to capture the complexity of this disease (5) as patients with similar prognoses may have variable pulmonary spirometry and radiological findings. At present, there is no simple parameter to accurately evaluate the prognosis of non-CF bronchiectasis