The cardio-sleep loop
During an apnea, blood pressure surges, heart rate spikes, and oxygen desaturates. Repeated hundreds of times per night across years, the vascular system adapts — and not in good ways. Cardiovascular disease is the most common downstream consequence of untreated sleep apnea.
Conditions where sleep evaluation changes outcomes
- Treatment-resistant hypertension — sleep apnea is present in a majority of cases
- Atrial fibrillation — CPAP-treated apnea reduces AF recurrence after cardioversion
- Heart failure with preserved or reduced ejection fraction — sleep-disordered breathing is independently prognostic
- Coronary artery disease — untreated OSA accelerates atherosclerosis
- Pulmonary hypertension — chronic intermittent hypoxia contributes
Our evaluation
- Polysomnogram with cardiac monitoring and SpO₂ profiling
- Review of ambulatory blood pressure recordings when available
- Coordination with cardiology — we are not a substitute for cardiac care, we are an addition
- Post-treatment polysomnogram to verify event resolution
Treatment
- CPAP for moderate-to-severe OSA, with quarterly adherence and effect review
- Positional and weight-based strategies when applicable
- Coordination with prescribing cardiologist on antihypertensive regimens — they often need adjustment after CPAP starts to work
The most certain treatment for sleep apnea is also the only one proven, at population scale, to prevent the cardiovascular complications.— Dr. Han Jin-Kyu