Thank you for the query.
47 bpm does not sound ok. Only at very active people like athletes such low heart rate
can be something normal. Otherwise it should be diagnosed.
Such low heart rate can be caused by some heart block
or even heart attack
. Moreover, if you have been defibrillated before, you are at high risk of heart problem.
You should go to ER if possible and have heart ECG performed. At your case, peacemaker seems reasonable solution.
Hope this will help. Feel free to ask further questions.