Sleep apnea and risk of aortic dissection: A nonrandomized, pair-matched cohort study

Background: Sleep apnea (SA) was associated with increased prevalence of aortic dissection (AD) in studies that were criticized for either their small sample size or lack of prospective observation. Using a considerably larger nationwide, population-based database and a long-term prospective cohort design, our study strived to explore the relationship between SA and the subsequent development of AD. Methods: From 2000 to 2007, we gathered a study cohort consisting of 15,848 newly diagnosed cases of SA from Taiwan's National Health Insurance Research Database. For the control group, another 39,826 individuals without SA were matched for age, sex, and comorbidity. The two cohorts were followed-up to observe the occurrence of AD. Results: During an average 3.59 +/- 2.41 years of follow-up, we observed 33 cases of new AD occurrence [non-SA (22, 0.1%) vs. SA (11, 0.1%), p = 0.669], and the incidence of AD was similar for both groups. After adjusting for age, sex, and comorbidity, only age [hazard ratio (BR) 1.03; 95% confidence interval (CI), 1.01-1.06; p = 0.006], male gender (HR 2.49; 95% CI, 1.07-5.79; p = 0.034), and hypertension (HR 6.28; 95% CI, 2.36-16.67; p < 0.001) were independently associated with AD diagnosis. Conclusion: SA was not associated with an increased risk of AD using a large nationwide cohort database. Nonetheless, larger prospective studies or meta-analyses are recommended to confirm our findings. Copyright (C) 2016, the Chinese Medical Association. Published by Elsevier Taiwan LLC.