Sleep apnea study finds male-female differences in cerebral cortex thickness, symptomsMarch 13, 2018
Researchers from the UCLA School of Nursing examined clinical records and magnetic resonance imaging brain scans of patients who were recently diagnosed with sleep apnea, and discovered several apparent connections between thinning of the brain's cerebral cortex and apnea symptoms. The researchers also could discern distinct changes in brain structures and concurrent symptoms that differed between men and women. For example, more regions of the superior frontal lobe were thinner in women with apnea than men or control groups, which might explain enhanced cognitive deficits among women with the disorder. No sleep apnea patients showed any thickening of the cerebral cortex. In addition, overall cortical thinning could possibly lead to impaired regulation of the autonomic nervous system and associated impaired breathing function through the upper airway in these patients.
Obstructive sleep apnea, which involves disruption of the upper airway, affects about 10 percent of adults. Its cause is unknown. Men are twice as likely to have sleep apnea as women, and symptoms and brain function appear to vary between men and women. However, while previous studies have made connections between brain structure changes and general clinical signs, none have definitively linked sex differences in brain structure with symptoms in sleep apnea. Left untreated, the impact of sleep apnea on brain damage progresses overtime.
Using high-resolution magnetic resonance imaging scans, the researchers looked at cortex thickness of 12 women and 36 men who had diagnoses of mild to severe obstructive sleep apnea (who were not being treated for their condition), and compared those findings to 40 male and 22 female controls (who did not have sleep apnea). The researchers then compared clinical findings of each patient with evidence of cortex thinning.
The study is one of the first to underscore significant clinical differences between men and women with sleep apnea, and points to the need for different treatment approaches to address these varied symptoms. The greater cortex injury in cognitive centers of women's brains may underlie their more common cognitive problems compared with men, while thinning associated with both men and women who have sleep apnea may be behind the disordered breathing seen between both. It is not clear whether these physical brain changes precede the sleep apnea disorder, or worsen sleep apnea's symptoms as the disorder progresses.
UCLA's Dr. Paul Macey is lead author, associate professor at the School of Nursing, and member of the Brain Research Institute at the David Geffen School of Medicine at UCLA. Other authors are Natasha Haris, Rajesh Kumar, Albert Thomas, Mary Woo and Ronald Harper, all at UCLA.
The research is published online in the journal PLOS ONE.
The research was supported by the National Institute of Nursing Research.
University of California - Los Angeles Health Sciences
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