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Blood clot risk trails childbirth, study says

Women have a higher risk of blood clots that can cause strokes, heart attacks and other problems for 12 weeks after childbirth – twice as long as doctors have thought, new research finds.

Strokes are still fairly rare right after pregnancy but devastating when they do occur and fatal about 10 percent of the time, said Dr. Hooman Kamel, a neurology specialist at New York’s Weill Cornell Medical College. Blood clots in the legs usually just cause pain but can be fatal if they travel to the lungs.

Kamel led the study, which was published online in the New England Journal of Medicine and presented at an American Heart Association stroke conference in San Diego on Thursday.

Pregnant women are more prone to blood clots because blood components to prevent excessive bleeding during labor naturally increase, and blood from the legs has more trouble traveling to the heart.

“Sometimes there’s the notion that once they deliver they don’t have to worry about these things,” but risk persists for some time after the birth, said Dr. Andrew Stemer, a Georgetown University neurologist.

Doctors now sometimes give low-dose blood thinners to certain women at higher risk of blood clots for six weeks after delivery. The new study suggests risk lasts longer than that.

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