My mother has tachycardia, otherwise known as arrhythmia, in humans, and it is, most of the time, provoked by diet, in some cases, chocolates, coffee or other caffeine related foods/beverages. My mother was prescribed Coumadin (warfarin), which in itself, is actually rat poison, in small doses that are prescribed to humans by physicians. Not sure how this condition would be treated by a C.A.V.
Whether it was a heart attack, tachycardia or other heart related medical issue, I am thinking that she will need to be prescribed medication for the rest of her life, to manage her heart functions. I am very glad that she survived this episode, as the heart, being a fragile organ, such attacks may be fatal.