Yes: A slow heart rate in which the electrical signal for each heartbeat originates from the sinus node (where it's supposed to originate). Generally, in an adult, this means a heart rate of less than 60. But keep in mind you can have a heart rate less than 60 and still be okay. For example many good athletes, whose hearts are in great shape, have resting heart rates less than 60.
Answered 4/30/2019
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HR : Any heart rate less than 60 beats per minute.
Answered 5/7/2013
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