Genetic Defect May Be Factor in Unexplained Drownings of Youths

A genetic defect that disrupts the heart’s rhythm may explain many of the hundreds of mysterious drownings of children and teenagers in the United States each year. Many young people’s drownings can be attributed to lack of supervision, alcohol or drug abuse, trauma or seizures. But roughly 10% of them have no explanation.

Now scientists, writing in today’s New England Journal of Medicine, believe a defect called long-QT syndrome may provide an answer.

The condition affects the heart’s electrical system and is triggered by exertion or a sudden fright. Long-QT syndrome can make someone faint, have seizures or die if a normal heart rhythm isn’t restored.

Compiled by Times medical writer Thomas H. Maugh II