Male 57, Exercise Induced PVCs 1999-2005, Full Time PVCs, 2006-2010. 14,000 per 24 hours. Controlled by Flecainide. Max heart rate in 2005 was 176, in 2006 after starting Flecainide was 150. Stopped taking Flecainide 6 weeks ago. No PVCs 98% of time. Max heart rate now 160. In 2005 I was a very good runner. In 2006-2010 I was just average runner. Why hasn't heart rate returned to 170 range?