Is It Advisable To Have Pacemaker In Heart Despite Taking Sotolol?

can vitamin b12 and vitamin d levels show up on a cbc blood test - also, doesa complete metobolic panel show magnesium level - also, I m on sotolol for rapid heart rate (I had quad heart surgery with a pace maker 6 1/2 yrs. ago) and don t want to get defibrillator as my Dr. suggests - if the sotolol is working why can t I just stay on that - also, have to get pacemaker replaced within next 6 months - are there problems withe wires during this surgery thanks