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Objective: To investigate if obstructive sleep apnoea (OSA) is an independent risk factor for severe COVID-19. To examine whether the risk for contracting COVID-19 is elevated among OSA patients. Design and setting: Registry based retrospective case-control study using Finnish nationwide health registries and the FinnGen Study cohort. Participants: Information regarding OSA diagnosis and COVID-19 infection was extracted from the FinnGen study (N=260,405) with a total of 305 patients who had a recorded PCR-validated COVID-19 infection including 26 (8.5%) individuals who were also OSA patients. Severe COVID-19 (N=83, 27.2%) was defined as an infection requiring hospitalization. Among the hospitalized individuals there were 16 (19.3%) with OSA diagnosis. In addition, we also included in our analysis previously reported risk factors for both severe COVID-19 or risk factors and comorbidities for OSA from FinnGen. Main outcome measures: OSA diagnosis, information concerning COVID-19 infection such as hospitalization, were derived from Finnish National Hospital Discharge Registry, Causes of Death Registry and the National Infectious Diseases Registry.
Results: We show that OSA is a risk factor for COVID-19 hospitalization independent from age, sex, body mass index (BMI), hypertension, diabetes, coronary heart disease (CHD), asthma and chronic obstructive pulmonary disease (COPD), (p-unadjusted=1.04x10^-4, OR-adjusted=5.24 [95%CI 1.33 to 23.43], p-adjusted=0.022). OSA was not associated with the risk of contracting COVID-19 (p=0.49). Conclusion: While an OSA patients risk of contracting COVID-19 is the same as non-OSA individuals, the OSA patients have a five-fold risk to be hospitalized when affected by COVID-19 than non-OSA individuals. Our findings suggest that, in assessment of patients with suspected or confirmed COVID-19 infection, OSA needs to be recognized as one of the comorbidity risk factors for developing a severe form of the disease.
Preprint available at medRxiv (Sept. 28, 2020):
