What is the primary action of Atropine used in bradyarrhythmia?

Atropine is primarily used in the context of bradyarrhythmias because it works as an anticholinergic agent that blocks the action of the vagus nerve on the heart. This blockade prevents the parasympathetic nervous system from exerting its effects, which normally slows the heart rate. As a result, Atropine effectively increases the heart rate by counteracting these vagal effects.

In cases of bradyarrhythmia, where the heart rate is abnormally low, the administration of Atropine is critical for restoring a more acceptable heart rate, which can help improve cardiac output and the overall delivery of oxygen to tissues. While it is essential to understand other physiological effects or considerations during cardiac management, the primary therapeutic action of Atropine in this scenario is unequivocally to increase the heart rate.