Looks like expected. I have an implanted defibrillator. The nerves in the left side of my heart are tangled, and that makes the signal travel just a nanosecond slower than the right side. It is hereditary; several members of my dad's family have it. It has never presented a problem; they just did tests once a year to make sure it hadn't gotten any worse, until COVID. Now it has slowed even more so that the left side of my heart will beat faster trying to catch up to the right, which causes the whole heart to spasm and can cause passing out or V-fib. This device sends out tiny shocks when it does that to get it back into rhythm. In three years, I have never felt the shocks; I just feel better.