Pharmacy PEBC Practice Exam

What is the role of beta-blockers in the treatment of arrhythmias?

1. To decrease heart rate and stabilize heart rhythm

2. To increase heart rate and improve blood flow

3. To prevent blood clots in the heart

4. To enhance cardiac contractility

The correct answer is: To decrease heart rate and stabilize heart rhythm

Beta-blockers play a crucial role in the treatment of arrhythmias primarily by decreasing heart rate and stabilizing heart rhythm. These medications work by blocking the effects of adrenaline on beta-adrenergic receptors located in the heart. By doing so, they reduce the heart's excitability and help control rhythms that are too fast or irregular. In conditions such as atrial fibrillation or atrial flutter, beta-blockers can effectively control the ventricular rate, allowing for improved hemodynamics and potentially alleviating symptoms associated with rapid heart rates. Additionally, their stabilizing effect on the cardiac electrical system reduces the likelihood of arrhythmias occurring, thereby promoting overall cardiac health and rhythm stability. The other options presented do not accurately reflect the role of beta-blockers in arrhythmia treatment. Increasing heart rate and enhancing cardiac contractility are contrary to the therapeutic effects of beta-blockers. Preventing blood clots in the heart is primarily the role of anticoagulants rather than beta-blockers. Understanding the specific actions of beta-blockers is essential in clinical settings, particularly for patients with various types of arrhythmias.