Mild obstructive sleep apnea increases hypertension risk, challenging traditional severity classification

Area of Science:

• Cardiology
• Pulmonology
• Sleep Medicine

Background:

• The clinical significance of mild obstructive sleep apnea (OSA) remains incompletely understood.
• Systemic arterial hypertension (SAH) is a major cardiovascular risk factor.

Purpose of the Study:

• To investigate the association between mild OSA and prevalent SAH.
• To explore a potential dose-response relationship between OSA severity and SAH risk.

Main Methods:

• Analysis of 4,732 participants from the European Sleep Apnea Database cohort.
• Comparison of SAH risk in mild OSA groups (AHI 5-<11/h and AHI 11-<15/h) versus nonapneic snorers.
• Adjustment for confounding factors including age, sex, obesity, and comorbidities.

Main Results:

• SAH prevalence was significantly higher in mild OSA groups (45%-52%) compared to nonapneic snorers (30%).
• Adjusted odds ratios for SAH were 1.56 (mild AHI 5-<11/h) and 1.79 (mild AHI 11-<15/h).
• Mild OSA (AHI 11-<15/h) remained a significant SAH predictor in both polygraphy and polysomnography analyses.

Conclusions:

• A dose-response relationship exists between mild OSA and SAH risk, starting from an apnea-hypopnea index of 5 events/h.
• Findings challenge traditional OSA severity thresholds and support risk stratification based on OSA severity.
• Mild OSA should be considered in cardiovascular risk assessment.