Multiple causes of death
Black women were more likely to have multiple causes of death, including cardiac arrest, heart failure, and hypertension. White women were more likely to die of arrhythmia, respiratory failure, pneumonia, and depression. Black men were also more likely to die of cardiac arrest, hypertension, and obesity; arrhythmias, ischemic heart disease, and chronic obstructive pulmonary disease were more common in White men.
The authors pointed out that continuous positive airway pressure (CPAP) is the mainstay of therapy for adults with OSA, but many studies have demonstrated decreased CPAP adherence among Black persons. For example, one report indicated that Black persons use CPAP on average 92 minutes less a day after 1 month of therapy than do White persons, for reasons that are not well understood. Asked by this news organization why Black men are so adversely affected by sleep apnea, Dr. Lee pointed out that studies have shown that sleep apnea is more severe in Black men when first diagnosed.
“We know that the severity of sleep apnea is a risk factor for mortality and cardiovascular outcomes,” he said, “so maybe delayed diagnosis, delayed treatment, and noncompliance with CPAP among Black men may help explain why mortality from sleep apnea among Black men has continued to increase.” Why nonadherence to CPAP is higher among Black men is also not clear. Even when access to CPAP is equal for Black patients and White patients, studies have found that rates of noncompliance to CPAP are higher among Black persons than among White patients.
“This is again a hypothesis,” Dr. Lee emphasized, “but perhaps health literacy among Blacks is lower than it is among White patients, and they may not realize that CPAP can improve health outcomes from sleep apnea,” he suggested. The use of CPAP requires a high level of self-advocacy, which might explain part of their noncompliance.
Other health behaviors and environmental factors may contribute to the tendency among Black patients to be noncompliant with CPAP. “I think this is the first study to show that there is a significant racial disparity in mortality from sleep apnea among Black males, and it should give physicians some insight into the problem; they can develop strategies or interventions to try and reduce racial disparities in outcomes from sleep apnea,” Dr. Lee said.
“So, this study is only the beginning, and we need to have more insight and strategies to improve outcomes among Black males,” he affirmed.
Asked to comment on the findings, Diego Mazzotti, PhD, said the study helps bring attention to existing health disparities related to sleep disorders. “Some of the trends observed by the authors seem to explain the increased recognition that sleep apnea may be a risk factor for cardiovascular morbidity and mortality,” said Dr. Mazzotti, assistant professor in the division of medical informatics at the University of Kansas Medical Center in Kansas City.
“Trends in certain minority groups and certain regions in the U.S. suggest that physicians need to recognize the impact of untreated sleep apnea on the cardiovascular health of these patients,” he said.
Dr. Lee and Dr. Mazzotti have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.