DARIEN, IL - Findings from a recent study show that patients with untreated, moderate to severe obstructive sleep apnea had a higher risk of experiencing a cardiovascular event, but the risk of incident heart problems was decreased in those who used CPAP therapy.
Results show that people with moderate to severe sleep apnea and no record of CPAP use were 71% more likely than those without sleep apnea to experience incident myocardial infarction, stroke, unstable angina, heart failure or cardiovascular death. Compared with the risk of heart problems in people with untreated sleep apnea, the risk of experiencing a cardiovascular event was 32% lower in patients with any severity of sleep apnea who used CPAP therapy, and it was 44% lower in those with moderate to severe sleep apnea who used CPAP.
"Our study contributes to understanding the role of CPAP therapy for cardiovascular risk prevention," said lead author Diego R. Mazzotti, who has a doctorate in psychobiology and is an assistant professor in the division of medical informatics in the department of internal medicine at the University of Kansas Medical Center. "We found the effects of CPAP were stronger in patients with moderate to severe sleep apnea, as well as in patients who used CPAP, on average, greater than 4 hours per night."
The researchers analyzed the electronic health records of patients who received a sleep study between January 2018 and September 2020 through the Kaiser Permanente Southern California health system. The sample comprised 11,145 people without sleep apnea, 13,898 patients with sleep apnea and a record of any CPAP use, and 20,884 patients with sleep apnea and no record of CPAP use. To be eligible for the analysis, patients had to be free of cardiovascular disease for one year prior to their sleep apnea diagnosis. Results were adjusted for baseline age, sex, body mass index, race/ethnicity, comorbidities, and use of anti-hypertensives and lipid-lowering medications. The median follow-up period was 262 days.
"Our study, while observational, suggests that clinical trials focused on understanding how to sustain long-term CPAP adherence in obstructive sleep apnea patients are necessary and could be critical for optimizing comorbidity risk reduction," said Mazzotti.
Nearly 30 million adults in the U.S. have obstructive sleep apnea, a chronic disease that involves the repeated collapse of the upper airway during sleep. Common warning signs include snoring and excessive daytime sleepiness. A common treatment is CPAP therapy, which uses mild levels of air pressure, provided through a mask, to keep the throat open during sleep.
The study is a multi-site collaboration between Kaiser Permanente Southern California (led by Dr. Jiaxiao Shi, lead regional research statistician, and Dr. Dennis Hwang, medical director of sleep medicine) and the University of Pennsylvania School of Nursing (led by Dr. Amy Sawyer, associate professor of sleep & health behavior).
The research abstract was published recently in an online supplement of the journal Sleep and will be presented as a poster beginning June 9 during Virtual SLEEP 2021. SLEEP is the annual meeting of the Associated Professional Sleep Societies, a joint venture of the American Academy of Sleep Medicine and the Sleep Research Society.
This study was supported by funding from the AASM Foundation and the American Heart Association. For a copy of the abstract, "Continuous Positive Airway Pressure and Cardiovascular Risk in a Large Clinical Sample of Obstructive Sleep Apnea Patients," or to arrange an interview with the study author or an AASM spokesperson, please contact AASM Communications Coordinator Corinne Lederhouse at 630-737-9700, ext. 9366, or email@example.com.
About the American Academy of Sleep Medicine
Established in 1975, the American Academy of Sleep Medicine (AASM) is advancing sleep care and enhancing sleep health to improve lives. The AASM has a combined membership of 11,000 accredited member sleep centers and individual members, including physicians, scientists and other health care professionals (aasm.org).
About the Sleep Research Society
The Sleep Research Society (SRS) is a professional membership society that advances sleep and circadian science. The SRS provides forums for the exchange of information, establishes and maintains standards of reporting and classifies data in the field of sleep research, and collaborates with other organizations to foster scientific investigation on sleep and its disorders. The SRS also publishes the peer-reviewed, scientific journals Sleep and Sleep Advances (sleepresearchsociety.org).