- 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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