What condition may result from carotid massage?

Carotid massage is a medical maneuver that is performed to stimulate the carotid sinus, which is sensitive to changes in blood pressure. When pressure is applied to the carotid sinus, it can stimulate the parasympathetic nervous system. This activation often leads to a decrease in heart rate, resulting in bradycardia.

Bradycardia is characterized by a slower than normal heart rate, usually defined as fewer than 60 beats per minute in adults, but may vary in children. The connection between carotid massage and bradycardia reflects the body's natural response to maintain homeostasis when sensing changes in blood flow or pressure within the carotid arteries.

In contrast, tachycardia, atrial fibrillation, and asystole do not typically result from this maneuver. Tachycardia involves an increase in heart rate, while atrial fibrillation is an irregular and often rapid heart rhythm originating in the atria. Asystole, or the absence of electrical activity in the heart, can occur in severe situations but is not a direct result of carotid massage. Thus, bradycardia is the anticipated effect of carotid massage, making it the correct answer.