Central Sleep Apnea

Area of Science:

• Sleep Medicine
• Respiratory Physiology
• Neurology

Background:

• Central sleep apnea (CSA) is a heterogeneous syndrome, not a singular disease, stemming from complex physiological dysregulations.
• The traditional view of sleep apnea as strictly obstructive versus central is an oversimplification; a continuum exists between these phenotypes.
• Understanding the underlying mechanisms, including chemical, metabolic, mechanical, and neural factors, is crucial for CSA diagnosis and management.

Purpose of the Study:

• To elucidate the complex etiologies and mechanistic divisions of central sleep apnea (CSA).
• To highlight the spectrum of sleep apnea, from obstructive to central phenotypes, and the concept of endotypes.
• To review current and emerging diagnostic and therapeutic strategies for CSA.

Main Methods:

• Review of current literature on respiratory control during sleep and CSA pathophysiology.
• Analysis of the obstructive-central continuum and endotype-driven classification of CSA.
• Examination of novel diagnostic tools (computational analytics, wearables) and therapeutic modalities (positive airway pressure, pharmacotherapy, phrenic nerve stimulation).

Main Results:

• CSA is mechanistically categorized into hypercapnic and hypocapnic types, encompassing various recognized syndromes.
• New approaches are enhancing the characterization of CSA etiology beyond traditional sleep study data.
• Residual disease is common with current positive airway pressure therapies, indicating a need for advanced strategies.

Conclusions:

• A deeper understanding of the obstructive-central sleep apnea continuum and patient-specific endotypes improves management.
• Multimodal therapy, potentially incorporating phrenic nerve stimulation and optimized drug treatments, represents the future of CSA management.
• Continued research into respiratory control and CSA pathophysiology is essential for advancing patient care.