BPM stands for <u>beats per minute</u>. If she only counted 30 seconds, you would have to times the beats she got (34) by two to make up a whole minute. If you count the beats for ten seconds, you would times it by six to make up a whole minute.
The most common such condition is such that occurs at childhood I.e. Kawasaki disease. It is a necrotizing vasculitis that is characterized be a predilection for the coronary arteries.