ABSTRACT - American Heart Assn endorses cooling of comatose patients whose hearts have been restarted so they can be brought back to life slowly, suffering less brain damage; cites studies in Europe and Australia showing that comatose patients whose bodies are cooled to 89.6 to 93.2 degrees Fahrenheit and maintained at that temperature for up to 24 hours suffer significantly fewer deaths and less brain damage than patients who are quickly resuscitated; assn's endorsement is published in journal Circulation; some major teaching hospitals already put comatose cardiac arrest victims on ice, but many smaller ones do not; about 680 Americans a day who have heart attacks go into sudden cardiac arrest, in which heart stops beating and begins to fibrillate; about 95 percent of those who suffer total cardiac arrest outside hospitals die; major public health campaign is under way to save some of those lives by mounting portible defibrillators in airliners, office buildings and other public places (M)


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