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Smoking Pot May Raise Stroke Risk in Young Adults
Date:2/6/2013

By Mary Brophy Marcus
HealthDay Reporter

WEDNESDAY, Feb. 6 (HealthDay News) -- Smoking pot may double a young adult's risk for stroke, new research suggests, but experts point out the study is small and not conclusive.

Scientists from New Zealand presented their data Wednesday at the American Stroke Association annual meeting, in Honolulu.

"Sixteen percent of stroke patients had positive cannabis screens, compared with only 8 percent of control participants," said study author Dr. Alan Barber, a stroke neurologist and professor of clinical neurology at the University of Auckland.

"We think the relationship between cannabis and stroke is certainly plausible," Barber said. "We know [from other studies] cannabis reduces the time to angina, that it's associated with myocardial infarction [heart attack] and heart rhythm problems. It can also cause vasoconstriction. If you constrict arteries in the brain, you can have reduced blood flow.

"We believe the association is not just a chance one, but worthy of further investigation," he added.

Barber's study involved 160 stroke patients and 160 healthy participants, all between 18 and 55, an age range during which people rarely suffer a stroke, he said.

Of the stroke patients, 150 had been admitted to the hospital for an ischemic stroke -- the most common kind of stroke, in which blood flow is blocked to the brain. The other 10 had been admitted for a transient ischemic attack (TIA or "mini-stroke"). All were given urine tests that screened for evidence of marijuana use.

Barber said the ingredients in marijuana show up in urine tests for three or four days if you only use it occasionally, but urine will test positive for the drug for 30 to 40 days in daily users.

The 160 control group patients had come to the hospital as internal medicine admissions with non-stroke diagnoses and did not know they were involved in the study. Their urine sample
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