Does CPAP actually improve heart health, or is it just for the snoring?

CPAP therapy in men with moderate-to-severe obstructive sleep apnea reduces nocturnal blood pressure by 2–10 mmHg, lowers 24-hour sympathetic nervous system activity as measured by urinary catecholamines, reduces plasma C-reactive protein, and in men with concurrent cardiovascular disease, reduces the frequency of nocturnal cardiac arrhythmias (Becker et al., Circulation, 2003).

CPAP does more than stop snoring, it interrupts the repetitive cycle of hypoxia, sympathetic activation, and blood pressure surge that constitutes the cardiovascular damage mechanism of sleep apnea. However, the evidence is nuanced: CPAP has not been shown in large RCTs (specifically the SAVE trial) to reduce rates of myocardial infarction or stroke in men with already-established cardiovascular disease, likely because established disease is not reversible through improved sleep. The benefit is clearest in men with hypertension, as CPAP can be as effective as adding an antihypertensive medication in sleep apnea patients whose blood pressure is difficult to control.

Honesty Scale: CPAP for blood pressure reduction, Solid (1) in hypertensive sleep apnea patients. CPAP for primary prevention of cardiac events, Promising (2). CPAP for secondary prevention (established CVD), Early (3).

What to do: If you are on multiple antihypertensive medications and have untreated sleep apnea, treating the sleep apnea with CPAP may reduce your need for medication. This is a discussion to have with a cardiologist or sleep medicine physician, not a primary care visit recommendation.

For the full picture, read The Sleep Architecture Deep Dive