Pacing at 100%
I would highly recommend insisting on setting changes. I was very disappointed with my ICD for the first two months. After I got the settings maximized, I was pacing at 100% Exactly what I needed! So what if I needed a battery replacement 5 years later! My EF went from 20 to 45 & isn't that the point. A squeaky wheel gets heard, sometimes!
When they were done changing my settings, while stil on the table, I got the first satisfying breath I'd had in 10 years!