Deaths of 51 U.S. patients who took widely prescribed drugs to treat attention deficit disorder prompted regulators to start watching for heart attacks, high blood pressure and other problems in 2004, a report released on Wednesday said. The U.S. Food and Drug Administration staff did not say the drugs were responsible for the fatalities, but they urged close monitoring for "the rare occurrence of pediatric sudden death during stimulant therapy." "These reports themselves do not establish a causal relationship between these medications and cardiovascular adverse events," wrote Dr. Gerald Dal Pan, director of the FDA's Office of Drug Safety, in...