Children who have heart surgery as infants may be more likely to have trouble focusing and paying attention in school when they are older, according to a new study. The study of 109 children who had surgery for complex heart defects showed that they were three to four times more likely to have symptoms of attention-deficit/hyperactivity disorder compared to other children. Of 109 children studied, 49 percent were receiving some type of remedial academic services, and 15 percent were assigned...