There has been an exponential increase in catheter ablation procedures for the treatment of cardiac arrhythmias over the last decade.
Shingles blisters usually scab over in 7-10 days and disappear completely in two to four weeks. In most healthy people, the blisters leave no scars, and the pain and itching go away after a few weeks or months.
In this case, the nerve involvement causes pain and extreme sensitivity, but the rash just never shows up. Usually with shingles, once the pain sets in, it can last for up to three days before the rash appears. Sometimes this period of pain before breakout lasts longer  the severe pain associated with shingles can continue for weeks, even months, before there's a rash.