Hi. I was pacing 100% as well as, prior to my heart transplant. One night I felt as if my ICD had moved. I called and they suggested going to the ER for an xray to see if the device had moved since it was implanted. All the leads and the device were still in place but they discovered an atrial flutter which did not subside until I was cardio-verted back into regular sinus rhythm. I would not have known about the flutter - it's not fib- if I hadn't gone in. So I was lucky. Also when I had my trans plant - one year and a half after this event - the surgeon who removed my ICD told me that the device was not fully in its pocket. While the earlier xray showed that it was stil in situ, its position had changed. This is not to frighten you but rather to say that you are always correct to call and have someone check on your device. I 'm sure all will go well for you.