How to find out Normal Heart Beat By ECG

The faster the heart rate, the less time the heart has for filling, and the cardiac output decreases.
An increase in heart rate increases oxygen consumption.
The normal sinus heart rate is 60 to 100 beats/min.
Sinus tachycardia is a rate more than 100 beats/min.
Sinus bradycardia is a rate less than 60 beats/min.

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