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]People with generalized epilepsy who have seizures arising from both sides of the brain simultaneously have a higher risk of obstructive sleep apnea than patients who have focal epilepsy where seizures emanate from one area of the brain, according to a new study.

The findings will help physicians better understand who is most at risk for obstructive sleep apnea (OSA) and therefore, who will benefit most from treatment. Treatment of OSA may help patients feel better and maintain better health. OSA treatment may also be an important part of epilepsy treatment.

“OSA is common in patients with epilepsy and treatment may improve seizure control. However, this condition is often undiagnosed in patients with epilepsy, and understanding of the risk profile for OSA is important,” says Matthew Scharf, an assistant professor of medicine and neurology at Rutgers Robert Wood Johnson Medical School and lead author of the paper in Epilepsy & Behavior.

The researchers looked at 115 patients from a Level 4 Epilepsy Center—27 with generalized epilepsy and 88 with focal epilepsy—to understand the relationship between their seizure frequency, epilepsy type, and results on a standard screening tool to assess obstructive sleep apnea risk.
Further, they found that older age, a higher body-mass index, and a history of high blood pressure were associated with a higher risk of obstructive sleep apnea in people with epilepsy.

The researchers found no significant difference in excessive daytime sleepiness—a common symptom of people with obstructive sleep apnea and epilepsy—between the types of epilepsy.

An estimated 22 million Americans suffer from sleep apnea, with 80% of the cases of moderate and severe obstructive sleep apnea going undiagnosed.
More than three million Americans have epilepsy, with more than 80% experiencing focal-onset seizures. About two-thirds of patients with epilepsy can have their seizures controlled with medication.

A variety of sleep apnea treatments exist, such as use of continuous positive airway pressure (CPAP), wearing an oral appliance to keep the throat open while sleeping, and weight loss.

“Possible reasons for higher risk of OSA in people with generalized epilepsy include greater brainstem dysfunction, altered control of the muscles of the upper airway, instability in the respiratory control system, and differences in the anatomy of the upper airway,” Scharf says.

Although the number of antiepileptic medications used was similar between the two groups, patients with generalized epilepsy may have started these medications at a younger age and have used them longer, which also could be a factor, he says.

Source: Rutgers University

Original Study
 DOI: 10.1016/j.yebeh.2020.107190
"The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." -- Marcus Aurelius
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