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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
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Vascular changes, cardiovascular disease and obstructive sleep apnea.

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Obstructive sleep apnea (OSA) causes nocturnal issues like intermittent hypoxia, leading to cardiovascular problems. OSA triggers inflammation and oxidative stress, contributing to conditions like hypertension and potentially atherogenesis.

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Area of Science:

  • Cardiovascular Medicine
  • Sleep Medicine
  • Pathophysiology

Background:

  • Obstructive sleep apnea (OSA) is linked to chronic cardiovascular diseases, including hypertension.
  • Nocturnal perturbations in OSA, such as intermittent hypoxia and intrathoracic pressure changes, drive these consequences.
  • Key mechanisms include sympathetic activation, endothelial dysfunction, oxidative stress, and systemic inflammation.

Purpose of the Study:

  • To explore the role of nocturnal perturbations in OSA.
  • To elucidate the contribution of endothelial dysfunction, oxidative stress, and inflammation to cardiovascular disorders in OSA patients.
  • To discuss the potential of OSA as a predisposing factor for atherogenesis.

Main Methods:

  • Review of existing literature on OSA and cardiovascular consequences.
  • Analysis of physiological changes during sleep in OSA patients.
  • Examination of biomarkers for oxidative stress and inflammation.

Main Results:

  • Intermittent hypoxia in OSA activates the renin-angiotensin system and increases endothelin-1 levels.
  • OSA is associated with increased oxidative stress markers (xanthine oxidoreductase, lipid peroxidation) and decreased antioxidant capacity.
  • Elevated inflammatory markers (C-reactive protein, IL-6, TNF-α) and endothelial dysfunction are observed in OSA patients, potentially resolving with CPAP therapy.

Conclusions:

  • Nocturnal perturbations in OSA significantly contribute to endothelial dysfunction, oxidative stress, and inflammation.
  • These factors play a causative role in the development of cardiovascular disorders.
  • OSA may be a significant predisposing factor for atherogenesis.