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Optimal Treatment of Sleep Apnea Reduces Cardiovascular Risk in Prediabetic Patients

by Anjali Aryamvally on May 21, 2018 at 1:17 PM
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Optimal Treatment of Sleep Apnea Reduces Cardiovascular Risk in Prediabetic Patients

New study identified that CPAP could significantly lower resting heart rates both during the day and at night in patients with abnormal glucose metabolism.

People with prediabetes have blood sugar levels higher than normal but below Type 2 diabetes levels. People with obstructive sleep apnea (OSA) experience times during sleep when air is obstructed from flowing normally into the lungs. CPAP is considered the "gold standard" treatment for OSA.

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According to Sushmita Pamidi, MD, lead study author and a sleep physician-scientist at McGill University, previous studies have found that OSA is associated with increased sympathetic activity, which activates our "fight or flight" response. This response, in turn, raises our heart rate.

"Both prediabetes and higher resting heart rates have been linked to cardiovascular disease," she said. "We wanted to see if CPAP would lower resting heart rates both during the day and at night in this group of patients with abnormal glucose metabolism."
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Of 39 participants in this study, twice as many were randomly assigned to CPAP as an oral placebo for 14 days. All-night adherence to CPAP was assured by monitoring all participants in a sleep lab throughout the two weeks. Resting heart rates were measured 24 hours a day for the two weeks using a portable monitoring device.

The study found that those using CPAP had significantly lower resting heart rates throughout the day and night than those in the placebo arm of the study. The differences between the two groups were more pronounced during the second week of the trial.

"The effect of CPAP on resting heart rate is comparable to using beta blockers," said Esra Tasali, MD, senior study author and director of the Sleep Research Center at the University of Chicago. Commonly prescribed for heart problems, beta blockers block stress hormones, such as adrenaline that raise heart rates.

"OSA is exceedingly common among individuals with abnormal glucose tolerance," Dr. Tasali added, noting recent estimates indicate that 80 percent of those with OSA in the general U.S. population are undiagnosed. "Our study is a first step in demonstrating that optimal treatment of sleep apnea reduces cardiovascular risk in those with prediabetes."



Source: Eurekalert
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