I am 34yr-old non-obstructive Hypertrophic Cardio Myopathy patient with Medtronic AICD. It is my second device, had it since 2002. My first device was Guidant in 1996. My first device expired, not because of battery but because my lead shocked me after 5 1/2 years, and was deemed no good. I never found out if it was a bad lead, or whether I wore down the lead, because I am a lefty, and from 22 to 28 I was very active, throwing motions, punching motions, sports, in the gym, etc. I have heard the leads can wear faster on younger more active people. Now I am replacing my Medtronic device, and I am wondering if I should get new leads while Im under. Because I don't want to get shocked or replace my leads before I get my next device in another 6 or so years. Yet, they say not to replace your leads unless if it is necessary because lead extraction is very difficult and more risky. So my basic question to those of you with experience with your devices is, WHAT IS your experience? Are the Medtronic leads real durable? Should I leave them in if they test out okay in the lab? Or should I change them now, while Im undergoing the procedure? Thanks.