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Sleep and Respiratory Infections
Ignacio Boira1, Eusebi Chiner1
1Sleep Unit, Pneumology Department, San Juan de Alicante University Hospital, Alicante, Spain.
Abstract:
Sleep disorders that involve circadian rhythm disruption and sleep-disordered breathing (SDB) such as obstructive sleep apnea (OSA) are closely linked to respiratory infections. SDB leads to a proinflammatory state due to intermittent hypoxia, sleep fragmentation, increased oxidative stress, and elevation of inflammatory mediators such as tumor necrosis factor (TNF), interleukin-6 (IL-6), and C-reactive protein (CRP). Furthermore, inflammatory mediator levels correlate with SDB severity, especially in people with OSA. Nocturnal microaspiration, gastroesophageal reflux, and associated comorbidities (e.g., obesity) increase the risk of community-acquired pneumonia, viral infections such as SARS-CoV-2, respiratory complications, and death. OSA has been associated with post-COVID syndrome. It also increases the risk of postoperative complications in both adults and children. Circadian rhythm disorders such as insomnia predispose to immune disorders and increase the risk of infection. Chronic conditions such as bronchiectasis, with or without concomitant cystic fibrosis, can lead to structural sleep changes and increase the risk of OSA due to chronic cough, arousals, aspirations, hypoxia, upper airway edema, and overexpression of proinflammatory cytokines. The protective effect of treatment for sleep disorders against respiratory infection is currently unknown. However, in people presenting with respiratory infection, it is important to test for SDB to prevent complications.
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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