It depends on several factors. There are several conditions that he could have. Also, it depends on his age. It can be normal for "young" people have arrhythmia's. They can correct themselves as one gets older. Was he prescribed any medication? Supra Ventricular Tachycardia
can happen, but usually after a short period of time, a person becomes very uncomfortable. SVT
is 150 bpm or greater. Find out more and let me know. If his doctor is aware, then probably there is no reason for concern.