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Tachycardia in adult is defined as a pulse rate of >100 beats per minute.
An abnormally fast pulse has various possible causes:
Tachycardia in a child varies depending on the age of a child (see table below). For example a pulse rate of 130 in a 10 year old is tachycardia but not in a 1 year old.
Heart rate by age (normal ranges) (1):
Heart rate (beats per minute)