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Positional obstructive sleep apnea (POSA) is linked to a reduced risk of future cardiovascular events compared to non-POSA. This suggests POSA may be a distinct subtype of sleep apnea impacting cardiovascular health.

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Area of Science:

  • Sleep Medicine
  • Cardiology
  • Respiratory Medicine

Background:

  • Obstructive sleep apnea (OSA) severity increases during supine sleep.
  • Positional OSA (POSA) predominantly occurs in the supine position.
  • The impact of POSA on future cardiovascular (CV) risk remains unclear.

Purpose of the Study:

  • To investigate the association between POSA and future CV risk.
  • To compare CV risk in patients with POSA versus those without POSA (non-POSA).

Main Methods:

  • A single-center study analyzed polysomnography data from 3,779 patients.
  • POSA was defined by specific apnea-hypopnea index (AHI) criteria for supine vs. non-supine positions.
  • Cox proportional hazard models assessed future CV event risk.

Main Results:

  • Patients with POSA exhibited a significantly lower risk of CV events compared to non-POSA patients (HR 0.85, p=0.010).
  • A trend towards lower CV risk was observed in the exclusive POSA (ePOSA) subgroup.
  • The study included 35.9% POSA, 38.4% non-POSA, and 25.7% no OSA patients.

Conclusions:

  • POSA is associated with a lower future cardiovascular risk than non-POSA.
  • POSA should be considered a distinct subtype in OSA research concerning CV outcomes.