Owner Mario Lemieux left a hospital one day after undergoing a medical procedure to help control his irregular heartbeat. Lemieux, 40, had a procedure known as cardiac ablation. A catheter was inserted through a blood vessel and was used to destroy a small section of heart tissue that was causing the abnormal electrical impulses that disrupt the heart's normal rhythm. Lemieux underwent treatment and stayed overnight, said Penguins spokesman Keith Wehner, declining to identify the hospital. "He did leave the hospital and go home (Tuesday)," Wehner said. "He's resting comfortably. He'll be able to resume normal activities in a very short period."