What characterizes sinus bradycardia?

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Sinus bradycardia is characterized by a slow heart rate that typically falls below 60 beats per minute, originating from the sinus node, which is the natural pacemaker of the heart. This condition is specifically defined not just by the rate but also by the presence of normal P wave morphology that indicates that the electrical impulses are still being generated in a normal manner from the sinus node. An alteration in the morphology of the P waves would suggest other underlying issues with the heart's electrical conduction.

While the other choices highlight features that are not associated with sinus bradycardia, the defining characteristic of having a slow heart rate together with normal P waves confirms that the impulses are originating correctly even if they are slower than typical. This is important in distinguishing sinus bradycardia from other types of arrhythmias, which may have irregular, absent, or abnormal P waves.