Patients with the nighttime breathing disorder known as obstructive sleep apnea who receive air through a mask while they sleep can significantly reduce their blood pressure, according to a study.

In obstructive sleep apnea, the upper airway narrows, or collapses, during sleep. Periods of apnea end with a brief partial arousal that may disrupt sleep hundreds of times a night.

 

More than half of people with sleep apnea also have high blood pressure, and their blood pressure does not fall during sleep as it does in most people.

The most widely used treatment for sleep apnea is a technique called nasal CPAP, for continuous positive airway pressure, which delivers air through a mask while the patient sleeps.

It has proved successful in many cases in providing a good night’s sleep and preventing daytime accidents due to sleepiness. Supplementary oxygen is sometimes used as a treatment for sleep apnea.

“Sleep apnea can have significant consequences on a person’s physical health, and this study shows once again that treatment may lessen those risks,” said lead researcher Daniel Norman, M.D., Fellow in Pulmonary and Critical Care at the University of California San Diego Medical Center.

After two weeks, patients who received the real CPAP treatment had significant reductions in blood pressure during the day and night. Nighttime oxygen therapy did not affect blood pressure.

“There has been some controversy over how sleep apnea causes elevated blood pressure,” Dr. Norman said. “Doctors don’t know if it is due to drops in oxygen levels or arousals from sleep. Our study indicated that correcting drops in oxygen levels alone may not be enough to reduce blood pressure.” 

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