Abnormally fast heart rate is called Tachycardia an abnormally slow rate is called  bradycardia .
What is an abnormally fast heart rate called?
Tachycardia refers to a heart rate that's too fast. How that's defined may depend on your age and physical condition. Generally speaking, for adults, a heart rate of more than 100 beats per minute (BPM) is considered too fast.
What is tachycardia and bradycardia?
Bradycardia and Tachycardia are two forms of irregular heart rates, or arrhythmias. These arrhythmias occur in the upper or lower chambers of the heart. Normal heart rate is 60-100 beats per minute. Bradycardia: This is an irregularly slow heart rate.
What is a slow heartbeat called?
Bradycardia is a heart rate that's too slow. What's considered too slow can depend on your age and physical condition. Elderly people, for example, are more prone to bradycardia. In general, for adults, a resting heart rate of fewer than 60 beats per minute (BPM) qualifies as bradycardia
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