ACE and obstructive sleep apnea syndrome: The anti-hypertensive medications were also similar between hypertensive patients with and without OSA: diuretics (75% vs. 72%), beta-blockers (38% vs.55%), calcium channel blockers (44% vs. 34%), angiotensin-converting enzyme inhibitors (64% vs. 50%) and angiotensin II receptor blockers (22% vs. 17%), were similar (P>0.1 for all comparisons).