Sleep-disordered Breathing in Neuromuscular Disease

Area of Science:

• Neurology
• Pulmonology
• Sleep Medicine

Background:

• Sleep-disordered breathing (SDB) is common in neuromuscular diseases (NMDs) due to reduced lung volumes, impaired sleep physiology, and specific disease features.
• Phasic REM sleep vulnerability and accessory muscle weakness can lead to oxygen desaturation and hypoventilation in NMD patients.
• Obstructive and central SDB can occur due to pharyngeal/bulbar issues, macroglossia, cardiomyopathy, or diaphragm weakness.

Purpose of the Study:

• To elucidate the pathophysiology of SDB in neuromuscular diseases.
• To highlight the role of polysomnography in diagnosing SDB and NMD-related respiratory compromise.
• To discuss SDB events triggered by noninvasive ventilation (NIV) and their impact.

Main Methods:

• Review of literature on SDB in NMDs.
• Analysis of physiological mechanisms contributing to SDB during sleep.
• Discussion of diagnostic challenges and management strategies, including NIV.

Main Results:

• Exaggerated lung volume reduction during supine sleep and REM sleep vulnerability are key factors in NMD-related SDB.
• Specific NMD characteristics predispose to upper airway collapse and central SDB.
• NIV, while standard care, can paradoxically trigger SDB events like central sleep apnea and glottic closure.

Conclusions:

• SDB in NMDs is multifactorial, involving respiratory muscle weakness and specific disease phenotypes.
• Polysomnography is crucial for accurate diagnosis, identifying NIV-induced SDB, and optimizing NIV settings.
• Understanding these SDB complexities is vital for effective patient management and improving sleep quality in NMDs.