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Memory improves after sleep apnea therapy

Patients with obstructive sleep apnea (OSA) may improve their memory by using continuous positive airway pressure (CPAP). A new study published in the December issue of CHEST, the peer-reviewed journal of the American College of Chest Physicians (ACCP), shows that the majority of patients with OSA, who were memory-impaired prior to treatment, demonstrated normal memory performance after 3 months of optimal CPAP use. The study also showed that memory improvement varied based on CPAP adherence. Patients who used CPAP for at least 6 hours a night were nearly eight times as likely to demonstrate normal memory abilities compared with patients who used CPAP for 2 or fewer hours a night.

"Patients with OSA often complain of daily forgetfulness, eg, losing their keys, forgetting phone numbers, or forgetting to complete daily tasks," said senior study author Mark S. Aloia, PhD, National Jewish Medical and Research Center in Denver, CO, who conducted his research while at Brown University Medical School, Providence, RI. "Where memory is concerned, we may have the ability to reverse some of the impairments by providing effective and consistent use of CPAP treatment."

Dr. Aloia and colleagues examined the degree to which varying levels of CPAP adherence improved memory in 58 memory-impaired patients with clinically diagnosed OSA. All patients underwent cognitive evaluation involving verbal memory testing prior to initiation of CPAP and at a 3-month follow-up visit. Patients were prescribed CPAP machines, and adherence was covertly monitored using internal microprocessors within each device. After treatment, patients were divided into three groups based on their 3-month CPAP adherence: (1) poor users (n=14), patients who averaged fewer than 2 hours/night of CPAP use; (2) moderate users (n=25), patients who averaged 2 to 6 hours/night of CPAP use; and (3) optimal users (n=19), patients who averaged more than 6 hours/night of CPAP use.

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Contact: Jennifer Stawarz
jstawarz@chestnet.org
847-498-8306
American College of Chest Physicians
11-Dec-2006


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