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Obstructive sleep apnea (OSA) is a significant risk factor for recurrent pulmonary embolism (PE) and restarting oral anticoagulation (OAC) after a first PE event. Identifying OSA can help predict future thromboembolic events.

Keywords:
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Area of Science:

  • Pulmonary Medicine
  • Sleep Medicine
  • Cardiovascular Research

Background:

  • Obstructive sleep apnea (OSA) is a known risk factor for initial pulmonary embolism (PE).
  • The impact of OSA on the risk of recurrent thromboembolism after PE is not well understood.
  • This study investigates the prognostic value of OSA in patients after discontinuing oral anticoagulation (OAC) following a first PE episode.

Purpose of the Study:

  • To determine if obstructive sleep apnea (OSA) predicts recurrent pulmonary embolism (PE) after oral anticoagulation (OAC) discontinuation.
  • To evaluate OSA as a prognostic factor for resuming OAC due to new thromboembolic events.
  • To identify sleep characteristics and clinical factors associated with PE recurrence.

Main Methods:

  • Home respiratory polygraphy was performed in 120 patients who stopped OAC after a first PE.
  • Sleep characteristics, PE risk factors, blood pressure, spirometry, physical activity, and D-dimer levels were recorded.
  • Patients were followed for 5–8 years to assess PE recurrence and OAC resumption.

Main Results:

  • An apnea-hypopnea index (AHI) ≥ 10 h⁻¹ was a significant independent risk factor for PE recurrence (HR, 20.73) and OAC resumption (HR, 20.66).
  • Lower mean nocturnal oxygen saturation (nSao₂) and higher time with Sao₂ < 90% (CT90%) were associated with increased PE recurrence risk.
  • Higher D-dimer levels and Epworth Sleepiness Scale (ESS) scores also predicted recurrent PE and OAC resumption, respectively.

Conclusions:

  • Obstructive sleep apnea (OSA) is an independent risk factor for PE recurrence after a first PE episode.
  • OSA severity, indicated by AHI and nocturnal oxygen desaturation, predicts the need to restart OAC for new thromboembolic events.
  • These findings highlight the importance of screening for OSA in PE survivors to refine risk stratification and management.