No exact answer: The beta-blocker is obviously causing bradycardia (heart rate<60). At 19 you should have plenty of physiological reserve to stay hemodynamically stable even with HR = 39, so you had no symptoms. However, let your doctor know. (S)he may want to lower your dose of propranolol because possible side effects of beta-blockers are depression and impotence.
Answered 5/22/2016
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