Dallas Stars forward Rich Peverley was back at practice Tuesday after undergoing surgery to correct an irregular heartbeat.“I am not really worried about it. I am on medication to help me,” Peverley told the Stars’ website. “Even if it does come back, it is not a career-threatening thing.”An EKG before training camp detected Peverley’s condition, he has skated three times since the procedure was done. He’s expected back full-time in three weeks. Peverley came with Tyler Seguin in the trade for Loui Eriksson.Coyote suspendedPhoenix foward Paul Bissonnette was suspended 10 regular-season games for leaving the bench Sunday to fight with Los Angeles defenseman Jordan Nolan, whose hit on the Coyotes’ Rostislav Klesla put him in the hospital with a concussion and whiplash.The hit triggered several fights. After reviewing the hit, the NHL took no action against Nolan.Thomas returnsGoalie Tim Thomas, 39, in net eight seasons for Boston before taking last season off for personal reasons, skated Monday in a tryout for the Florida Panthers and could sign soon.