Sinus bradycardia is defined as a sinus rate < 60 bpm.

 

 

 

 

 

In most instances sinus bradycardia is a benign arrhythmia.

In healthy young adults and trained athletes, resting sinus bradycardia may be a normal phenomenon caused by increased vagal tone.

Sinus bradycardia during sleep in elderly individuals is common.

Inability to increase sinus rates adequately during exercise is considered abnormal . Sinus bradycardia < 40 bpm (not associated with sleep or physical conditioning) is generally considered abnormal. Correlation of symptoms with sinus bradycardia is critical in the evaluation of these patients.

 

 

 

 

 

 

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