Stoelting's Anesthesia and Co-Existing Disease · 8th Edition
Sleep-Related Breathing Disorder
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Key Takeaways
- Obstructive sleep apnea accounts for approximately 90 percent of all sleep-related breathing disorder cases and results from mechanical upper airway collapse despite intact respiratory muscle effort.
- Central sleep apnea involves absent or inadequate respiratory muscle effort, frequently occurring in heart failure with Cheyne-Stokes breathing and chronic opioid administration scenarios.
- Polysomnographic diagnosis using apnea-hypopnea index measurements stratifies obstructive sleep apnea severity and guides treatment intensity selection based on event frequency.
- Untreated obstructive sleep apnea significantly increases risk for hypertension, coronary artery disease, stroke, heart failure, and neurocognitive impairment across patient populations.
- Positive airway pressure therapy provides pneumatic airway splinting as first-line treatment, with progression to oral appliances or surgical interventions when initial management fails.
- Perioperative settings demand heightened vigilance due to anesthetic agents and analgesics that further depress airway patency and respiratory drive in vulnerable patients.
Chapter SummaryWhat this audio overview covers
Sleep-related breathing disorders encompass a spectrum of conditions characterized by abnormal ventilation during sleep, with significant clinical implications across multiple organ systems. The International Classification of Sleep Disorders standardizes four primary categories: obstructive sleep apnea affecting roughly 90% of affected individuals, central sleep apnea syndromes accounting for approximately 9% of cases, and sleep-related hypoventilation and hypoxemia representing the remaining 1%. Obstructive sleep apnea results from mechanical upper airway collapse despite continued respiratory muscle effort, diagnosed through polysomnography by measuring the apnea-hypopnea index, which stratifies severity from mild to severe based on event frequency per hour. The pathophysiology involves anatomic airway narrowing, impaired arousal responses, and unstable ventilatory control mechanisms, with resolution occurring through increased muscle activation and cortical arousal. Untreated obstructive sleep apnea precipitates serious morbidities including hypertension, coronary artery disease, stroke, heart failure, neurocognitive dysfunction, and metabolic derangement. Central sleep apnea differs fundamentally by involving absent respiratory effort, occurring in contexts such as heart failure with Cheyne-Stokes breathing pattern or chronic opioid exposure that depresses medullary respiratory centers. Sleep-related hypoventilation and hypoxemia represent sustained elevations in carbon dioxide and oxygen desaturation, exemplified by obesity hypoventilation syndrome in severely obese individuals. The physiologic basis underlying these disorders involves sleep-induced blunting of hypoxic and hypercapnic responses, particularly during rapid eye movement sleep, combined with decreased pharyngeal muscle tone that increases upper airway resistance substantially. Pediatric presentations differ from adults, with adenotonsillar hypertrophy as the predominant etiology rather than obesity, requiring distinct diagnostic criteria and treatment approaches. Management progresses through tiered interventions beginning with positive airway pressure therapy functioning as pneumatic airway splinting, advancing to oral appliances or surgical procedures when initial therapy proves insufficient, alongside lifestyle modifications including weight loss and substance avoidance. The perioperative setting presents heightened risk due to anesthetics, sedatives, and analgesics that further compromise airway patency and respiratory drive, necessitating careful patient screening, anesthesia technique selection, postoperative monitoring, and opioid-sparing pain management strategies.