What is the function of adenosine when treating atrial tachycardia?

• A. To slow down the heart rate
• B. To increase heart rate
• C. To maintain rhythm stability
• D. To enhance cardiac output

Answer: (A)

Adenosine is primarily utilized in the treatment of atrial tachycardia due to its ability to slow down the heart rate. It works by temporarily interrupting the electrical conduction through the atrioventricular (AV) node, which can effectively restore normal sinus rhythm in patients experiencing tachycardia. This action results from adenosine's effects on the heart's electrical activity, leading to a transient increase in the refractory period of the AV node and a decrease in the conduction velocity.

In this context, the other options do not align with adenosine's pharmacological effects in treating atrial tachycardia. Increasing heart rate would be counterproductive in a situation where the heart is already beating too quickly. Maintaining rhythm stability and enhancing cardiac output are not the primary functions of adenosine in this scenario, as its main role is to induce a controlled slowing of the heart rate to achieve a reversion to normal sinus rhythm.