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http://query.nytimes.com/gst/abstract.html?res=F20F1FF6385B0C708DDDAC0894DB404482

Health & Fitness | May 13, 2003, Tuesday
Heart Pump and Brain Injury: A Riddle Deepens With Time

By GINA KOLATA (NYT) 1947 words
Late Edition - Final , Section F , Page 1 , Column 1

LEAD PARAGRAPH - Each year, 300,000 Americans have bypass surgery to improve blood flow to their hearts. Most of the operations succeed. But a minority of patients leave the hospital confused or forgetful, unable to think clearly or unable to concentrate.

''Pumpheads,'' some doctors privately call those patients, and the information shows that a third or more may be affected. As the term implies, doctors attributed the problems to the pump, the heart-lung machine that takes over during surgery when doctors literally stop a heart from beating so that they can repair its blocked vessels.

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