My guess is that concern was not enough at that rate to initiate treatment for tachycardia but I don't know the facts. I think comfort should be considered a factor.

I often see Xarelto and other anticoagulation meds referred to as "cardiac meds." My Afib team has told me these meds are not cardiac meds, since they offer little if any therapy to the heart. Their effects are felt wherever your blood flows -- in my case causing slight bleeds wherever a sore opens, usually in my internal and external epithelium (skin or internal organ lining such as of the bladder). That's why they're often referred to as "blood thinners," which may be slightly off-kilter also.