Hi, I am relatively new to the blog and I would like to say it has been very helpful to me. I was wondering if anyone else has a 3 lead? I just had my St. Jude ICD/PM 2 lead replaced yesterday with a 3 lead, due to my low EF and V-Fib. The new model will sense when my upper chamber is pacing, sending a signal to the bottom chamber so my heartbeats will be synchronized. I am very hopeful I will see a positive change in energy etc.