An experimental blood test may someday help doctors know which patients are about to have a massive, possibly deadly, heart attack. The test is still at least a year or two from clinical use, but researchers at the Scripps Research Institute in San Diego say they've found that certain cells in the blood of heart attack patients are abnormally large and misshapen. Researchers are using the test in some emergency rooms to determine whether that clue means a patient is on the brink of an attack, or facing it within a couple of weeks.
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