I am 82 years old, I have had a heart ablation 4 years ago, I have been on bisoprolol 5mg one half twince a day, recently I have started to have palputaions again 2-3 times a week and then my donc. put me on APO-diltiaz cd 180mg a week ago, since I have have had more palputation more frequest but less siviere, the diltiaz was taken 1 capsule once a day before going to bed. Last friday I call my doctor and he advised to take the diltiaz in the morning instead since then I have not had any patputations but I feel light headed and can feel my heart skip at times. I am schedules for a nulear study in a few weeks. Is this normal? Maurice,