The severity of coronary heart disease and the incidence and severity of following obstructive sleep apnea: a population-based cohort study.

Obstructive sleep apnea (OSA) is characterized by pharyngeal collapse, hypoxia, and hypercapnia. However, the impact of coronary heart disease (CHD) severity on OSA development has been rarely explored. This study aimed to evaluate the correlation between CHD severity and OSA incidence. This retrospective cohort study was conducted using the National Health Insurance Research Database (NHIRD). Patients with CHD were categorized into three groups: those with severe CHD who underwent percutaneous coronary intervention (PCI), those with CHD without PCI, and those receiving medical treatment. The primary outcome was the development of OSA at least six months after CHD onset. Cox proportional hazards regression was used to calculate the adjusted hazard ratio (aHR) and 95% confidence interval (CI) for OSA across the different CHD groups. A total of 5,193 and 8,313 OSA events were recorded in the CHD-PCI and CHD groups, respectively. After adjusting for multiple confounders, the incidence of OSA was significantly higher in the CHD-PCI group than in the CHD group (aHR: 1.267, 95% CI: 1.220-1.315, P = 0.0135). Subgroup analyses showed that the association between severe CHD with PCI and OSA was more pronounced in older CHD patients (P < 0.05). The cumulative incidence of both OSA and severe OSA was significantly higher in the CHD-PCI group than in the CHD group (both P < 0.001). Severe CHD requiring PCI is associated with a higher incidence of subsequent OSA compared to mild CHD. This association is particularly significant in patients older than 70 years.