The<unk>  consists of the combination of<unk>  (body mass index above 30 kg/m2), falling oxygen levels in blood (hypoxia) during sleep and increasing carbon dioxide levels (hypercapnia); this is the result of<unk>  (excessively slow or shallow breathing) during sleep. Obstructive sleep apnea is often but not necessarily present.
It may cause dyspnea (difficulty breathing), poor sleep with daytime tiredness, leg swelling and various other symptoms. The main treatments are weight loss and nocturnal ventilation (with CPAP or related methods). The exact pathophysiologic mechanism remains unknown.
Obesity hypoventilation syndrome
Hyperventilation syndrome
Upper airway resistance syndrome
Reactive airways dysfunction syndrome
Sleep apnea
Central sleep apnea
Asthma
Exercise induced asthma