@windyshores
I started letrozole at the same time I started Kisqali. Hmmm. I blame Kisqali because it can cause QT prolongation as well and that happened to me. Only 4% of people have the side effect. They lowered the dose to stop the very dangerous QTP that can cause you to just drop dead and it stopped on the lower dose. Afib started that first week of treatment as well so it seemed to be a safe assumption. Maybe it's Kisqali, maybe Letrozole or maybe the combination. Either way, I'll be taking both meds long term.