Acute respiratory distress syndrome (ARDS)[10] COPD[2] Primary pulmonary hypertension[2] Blood clots in lungs[2] Kyphoscoliosis[2] Interstitial lung disease[2] Cystic fibrosis[2] Sarcoidosis[11] Obstructive sleep apnea (untreated)[2] Sickle cell anemia[12] Bronchopulmonary dysplasia (in infants)[13]