Background: The pathogenesis of daytime hypercapnia (PaCO 2 ≥ 45 mm Hg) may be directly linked to the existence of obstructive sleep apnea syndrome (OSAS) per se, although only some patients ...

Sufferers have difficulty breathing, which reduces their blood-oxygen levels and can raise carbon dioxide levels (a condition called hypercapnia). The condition regularly recurs, and patients ...