Do you remember what the heart rate was? This information would be helpful to me in answering your question.
While I cannot answer for a particular surgeon, I can tell you that a normal rhythm of 120 beats per minute would not be a problem for most surgeons. This is as long as you are in good health generally (no fevers or illness, blood pressure under control, etc), which it sounds like is the case.
Discuss this with your surgeon. If he seems hesitant or has any misgivings, he may suggest a follow up EKG or a consultation with a cardiologist. If after these, he is still unwilling to operate on you, it is important for you to respect his decision in the matter. he has your health and wellbeing in mind.
Please let me know if I can answer any more questions. If not, please don't forget to accept this answer.
Best wishes, and I hope you are able to get the surgery as scheduled.