When to Go to the Hospital for Rapid Heart Rate - Verywell Health
https://www.verywellhealth.com/hospital-rapid-heart-rate-5216290
Oct 27, 2022 · A slower heart rate is called bradycardia , and a faster heart rate is called tachycardia. In certain circumstances, a heart rate higher or lower than what's considered normal is nothing to worry about. It all depends on what you're doing. For example, some people may have a heart rate in the 50s while sleeping, which is completely normal.
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