Final answer:
Biventricular Pacing, or Cardiac Resynchronization Therapy (CRT), is primarily indicated for the treatment of bundle branch block in patients with heart failure and prolonged QRS duration, aiming to correct dyssynchronous ventricular contractions.
Step-by-step explanation:
The primary indication for Biventricular Pacing, also known as Cardiac Resynchronization Therapy (CRT), is a condition known as bundle branch block. This condition affects the electrical conduction system of the heart, leading to asynchrony in the contractions of the ventricles. CRT is specifically used to treat patients with heart failure who also have a prolonged QRS duration on an electrocardiogram (ECG), indicative of dyssynchronous ventricular contractions. By simultaneously pacing both ventricles, CRT seeks to improve the efficiency of the heart's contractions, thereby enhancing cardiac function and symptomatology in patients with specific types of heart failure.
Turning to the other options provided, atrial fibrillation and ventricular tachycardia are other forms of arrhythmias which may require different forms of treatment such as medication or an implantable cardioverter-defibrillator (ICD). Bradycardia, a slow heart rate, may be treated with a standard pacemaker if symptomatic. However, it's important to note that CRT is distinct in its role to manage heart failure accompanied by dyssynchronous ventricular contractions, often due to bundle branch block.