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Normal heart rate
range is from 60 to 100 And slow heart means it is below 60 per minute.It is called bradycardia
. Heart rate is depends upon individuals.It is normally low in athlete.Otherwise there are so many conditions in heart rate is low.
It is only confirmed by certain investigations like THYROID
PROFILE, S.ELECTROLYTE, ECG,ECHO and other specialty investigations.
You have to consult cardiologist
for better guidance,proper diagnosis and medical management.