Sleep and Respiratory Infections

Ignacio Boira1, Eusebi Chiner1

  • 1Sleep Unit, Pneumology Department, San Juan de Alicante University Hospital, Alicante, Spain.

Insights

Sleep-disordered breathing (SDB), like obstructive sleep apnea (OSA), elevates inflammation and increases respiratory infection risks. Early SDB screening in respiratory patients is crucial for preventing complications.

Area of Science:

  • Sleep Medicine
  • Infectious Diseases
  • Pulmonology

Background:

  • Sleep disorders, including circadian rhythm disruption and sleep-disordered breathing (SDB) like obstructive sleep apnea (OSA), are increasingly recognized for their significant link to respiratory infections.
  • SDB contributes to a proinflammatory state through intermittent hypoxia, sleep fragmentation, oxidative stress, and elevated inflammatory mediators (TNF, IL-6, CRP), with levels often correlating with SDB severity, particularly in OSA patients.
  • Associated factors like nocturnal microaspiration, gastroesophageal reflux, and comorbidities (e.g., obesity) further elevate risks for pneumonia, viral infections (including SARS-CoV-2), and other respiratory complications.

Purpose of the Study:

  • To explore the intricate relationship between sleep disorders, particularly SDB and OSA, and their impact on respiratory infection susceptibility and outcomes.
  • To highlight the mechanisms by which SDB promotes inflammation and increases the risk of various respiratory infections and complications.
  • To emphasize the importance of considering SDB in patients presenting with respiratory infections to mitigate potential adverse events.

Main Methods:

  • Literature review and synthesis of existing research on sleep disorders, SDB, OSA, and respiratory infections.
  • Analysis of the pathophysiological links between SDB, inflammation, and immune responses.
  • Examination of epidemiological data and clinical observations connecting sleep disorders with infection risks and outcomes.

Main Results:

  • SDB, including OSA, is strongly associated with a proinflammatory state, increasing susceptibility to respiratory infections like community-acquired pneumonia and viral infections (e.g., SARS-CoV-2).
  • OSA is linked to increased postoperative complications and post-COVID syndrome, and chronic conditions like bronchiectasis can exacerbate OSA risk.
  • While the protective effect of sleep disorder treatment against infection remains under investigation, SDB is a significant risk factor for respiratory complications.

Conclusions:

  • Sleep-disordered breathing significantly contributes to inflammation and elevates the risk of respiratory infections and associated complications.
  • Screening for SDB in patients with respiratory infections is essential for timely management and prevention of severe outcomes.
  • Further research is needed to elucidate the protective role of sleep disorder treatments in mitigating respiratory infection risks.

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