Carlos Silva was released from a Denver hospital and placed on the disabled list for a cardiac evaluation Monday, one day after an abnormal heart rate forced the Chicago Cubs pitcher to leave his start against the Colorado Rockies. Silva returned to Chicago, and consulted with a Cubs physician about the abnormal heart rate that caused the pitcher to leave Sunday's game at Colorado in the first inni http://sports.espn.go.com/chicago/mlb/news/story?id=5431952
