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CPAP therapy improves surrogate, intermediate, and functional cardiovascular outcomes in adults with obstructive sleep apnea, particularly blood pressure, left ventricular function, and sympathetic activity.

This umbrella review of 38 systematic reviews and meta-analyses found that CPAP therapy was associated with significant reductions in systolic blood pressure (MD -4.8 mmHg) and diastolic blood pressure (MD -3.0 mmHg), improvements in left ventricular ejection fraction (MD 3.27) and diastolic function (WMD 0.22), and reduced sympathetic activity (noradrenaline SMD -1.10). However, the certainty of evidence ranged from low to moderate, and no consistent reduction in major adverse cardiovascular events or mortality was demonstrated.

Last updated: Aug 28, 2026•0 RCTs•1 Meta-analyses•📖 Read as article →

Evidence Score

Evidence Score49/100
Human RCT☆☆☆☆☆
Meta-analysis★★★☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Effects of Continuous Positive Airway Pressure on Surrogate, Intermediate, and Functional Cardiovascular Outcomes in Obstructive Sleep Apnea: An Umbrella Review of Systematic Reviews and Meta-Analyses.

meta

Bunjaku J, Rashiti P, Lama A, Bunjaku G, Koliqi R · Medicina (Kaunas, Lithuania) (2026)

Participants: 38
Duration: N/A
Intervention: Continuous Positive Airway Pressure (CPAP) therapy
Outcome: Cardiovascular outcomes including blood pressure (systolic, diastolic, 24h ambulatory), left ventricular ejection fraction, diastolic function, sympathetic activity (noradrenaline), BNP/NT-proBNP, NYHA functional class, and body mass index
Effect Size: SBP MD -4.8 mmHg; DBP MD -3.0 mmHg; LVEF MD 3.27; LV diastolic function WMD 0.22; noradrenaline SMD -1.10
Population: Adults with obstructive sleep apnea (OSA), including those with heart failure

Result: This umbrella review of 38 systematic reviews and meta-analyses found that CPAP therapy was associated with significant reductions in systolic blood pressure (MD -4.8 mmHg) and diastolic blood pressure (MD -3.0 mmHg), improvements in left ventricular ejection fraction (MD 3.27) and diastolic function (WMD 0.22), and reduced sympathetic activity (noradrenaline SMD -1.10). However, the certainty of evidence ranged from low to moderate, and no consistent reduction in major adverse cardiovascular events or mortality was demonstrated.

PubMed: 42654353DOI: 10.3390/medicina62081456

Mechanism Graph

CPAP prevents upper airway collapse during sleep, reducing apneas and hypopneas
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Improved oxygenation and reduced intermittent hypoxia
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Decreased sympathetic nervous system activation and reduced catecholamine levels
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Reduced afterload and improved cardiac function, leading to lower blood pressure and better ventricular performance

Limitations

  • ⚠Certainty of evidence ranged from low to moderate due to heterogeneity and methodological limitations
  • ⚠Methodological confidence of included reviews was predominantly moderate, low, or critically low (AMSTAR 2)
  • ⚠Insufficient evidence to demonstrate consistent reduction in major adverse cardiovascular events or cardiovascular mortality

Frequently Asked Questions

Does CPAP reduce blood pressure in OSA patients?▼

Yes, CPAP was associated with a mean reduction of 4.8 mmHg in systolic and 3.0 mmHg in diastolic blood pressure, along with improvements in 24-hour ambulatory blood pressure.

What is the effect of CPAP on heart function?▼

CPAP improved left ventricular ejection fraction by a mean difference of 3.27 and left ventricular diastolic function (WMD 0.22), particularly in patients with heart failure.

Does CPAP reduce sympathetic nervous system activity?▼

Yes, CPAP reduced circulating noradrenaline levels with a standardized mean difference of -1.10, indicating decreased sympathetic activity.

Is CPAP effective in reducing cardiovascular mortality?▼

Current evidence is insufficient to demonstrate a consistent reduction in major adverse cardiovascular events or cardiovascular mortality; longer-term high-quality trials are needed.

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References

  1. 1.Bunjaku J, Rashiti P, Lama A, Bunjaku G, Koliqi R. "Effects of Continuous Positive Airway Pressure on Surrogate, Intermediate, and Functional Cardiovascular Outcomes in Obstructive Sleep Apnea: An Umbrella Review of Systematic Reviews and Meta-Analyses.." Medicina (Kaunas, Lithuania), 2026. PMID: 42654353 DOI: 10.3390/medicina62081456
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.