How would carotid massage affect the heart rate?

Carotid massage stimulates the carotid sinus, which contains baroreceptors that sense blood pressure changes. When stimulated, these receptors can trigger a reflex that activates the parasympathetic nervous system, leading to a decrease in heart rate (bradycardia). This response can help manage certain types of tachycardia by promoting a slower heart rate and restoring normal rhythm. However, it should be performed cautiously and under medical supervision, as it can potentially cause complications.