FIGURE 4.

Proposed topics for future research in obstructive sleep apnoea (OSA). Research topics in OSA should be elaborated in four major domains: syndrome definition, diagnostic methodology, management, and clarifying the role of comorbidity. Figure reproduced from (McNicholas et al., 2018) with permission from the publisher. AHI, apnea–hypopnea index. CPAP, continuous positive airway pressure; ODI, oxygen desaturation index