Skip to content

Sleep Apnea Health Center

Font Size

Sleep Apnea May Spur Night Heart Attacks

Obstructive Sleep Apnea May Trigger Nighttime Heart Attacks
WebMD Health News

July 21, 2008 -- Obstructive sleep apnea may make nighttime heart attacks more likely than daytime heart attacks, a new study shows.

In obstructive sleep apnea, the upper airway becomes completely or partially blocked, interrupting regular breathing, several times per night.

The new study, published in the Journal of the American College of Cardiology, recommends that people who have heart attacks while sleeping at night be screened for obstructive sleep apnea.

The study included 92 people who had recently had a heart attack.

The patients reported what time their heart attack symptoms started. They also took part in a sleep study about 17 days after their heart attack. The sleep study showed that 64 patients had obstructive sleep apnea.

The patients with and without sleep apnea were pretty similar in their backgrounds and medication use. But the timing of their heart attacks was different.

The patients with obstructive sleep apnea were six times more likely to have had their heart attack between midnight and 6 a.m. than during the rest of the day. In contrast, the patients without sleep apnea were more likely to have had their heart attack between 6 a.m. and noon.

Obstructive sleep apnea "may be a trigger" for heart attacks, write the researchers, who included the Mayo Clinic's Fatima Kuniyoshi, PhD. Kuniyoshi's team calls for further studies to see if obstructive sleep apnea treatment reduces heart attack risk, especially at night.

Today on WebMD

Sleep Disorders What Are They
Man sleeping on plane
Sleep Fact or Fiction Test Yourself
Woman asleep with cpap mask on.
Pet scan depression
Nighttime Heartburn
Fight Fatigue Sleepiness On The Road
Sleep Apnea Appliance
Foods That Help Or Harm Your Sleep
Sleep Apnea Clues
Insomnia 20 Tips For Better Sleep
Breus Sleep Apnea

WebMD Special Sections