Recent studies have shown that there is a major increase in the incidence of stroke in those who have Sleep Apnea. In fact, the risk of stroke is increased to three times normal. A recent study done on those with Transient Ischemic Attacks (TIA) revealed that over 60% of those patients had Sleep Apnea. In an accompanying editorial, a leading neurologist stated that all patients with strokes should be screened for Sleep Apnea.
One may wonder, why the increased incidence of Sleep Apnea in stroke victims? First of all, during the episodes of Apnea (stopping breathing) there is a major decrease in blood flow to the brain. There is also an accompanying increase in pressure in the brain, further inhibiting blood flow. Also, blood tends to clot more easily in those with Sleep Apnea. Most victims develop high blood pressure and damage to the lining of the blood vessels. This further predisposes them to the occurrence of strokes. Finally, and most importantly, the brain loses its ability to control its own blood flow. This is called cerebral autoregulation and is very important in preventing strokes. If you or a loved one has had a stroke or TIA it is important to make sure that you do not have Sleep Apnea.
