[Sleep-disordered breathing in neuromuscular diseases]

Area of Science:

• Pulmonary Medicine
• Neurology
• Sleep Medicine

Context:

• Sleep-disordered breathing (SDB) is prevalent in neuromuscular diseases (NMDs).
• The relationship between SDB and daytime respiratory function in NMDs is not well-defined.
• Progressive myopathies represent a significant population affected by these respiratory challenges.

Purpose:

• To prospectively investigate the correlation between supine lung function and respiratory muscle function with polysomnography/capnometry in patients with progressive myopathies.
• To determine the predictive value of supine inspiratory vital capacity (IVC(S)) for SDB and daytime hypercapnia in this cohort.

Summary:

• 32 out of 35 patients with progressive myopathies exhibited a restrictive ventilatory defect.
• Supine inspiratory vital capacity (IVC(S)) strongly correlated with respiratory muscle strength, respiratory muscle strain, and daytime blood gases (PaCO2).
• Low IVC(S) (<60% predicted) was highly sensitive and specific for detecting SDB and predicting daytime hypercapnia, including REM-sleep hypopneas and continuous hypoventilation.

Impact:

• IVC(S) serves as a crucial, non-invasive measure for assessing respiratory health in NMD patients.
• Findings highlight the utility of IVC(S) in identifying patients at risk for SDB and hypercapnic respiratory failure.
• This research provides a foundation for improved monitoring and management strategies for respiratory complications in NMDs.