What is the most common type of wide QRS complex tachycardia?

Ventricular Tachycardia (VT) is indeed the most common type of wide QRS complex tachycardia. In VT, the electrical impulses that control the heart's rhythm originate in the ventricles rather than the atria, leading to a rapid heart rate that results in a wide QRS complex on the ECG. This occurs because the ventricular depolarization process is abnormal, causing a delay in the conduction through the ventricles, which manifests as a wide QRS. Recognizing this type of arrhythmia is critical for treatment, as it can compromise cardiac output and lead to more severe conditions, including ventricular fibrillation.

The other options, while they may appear in various contexts, do not typically present as wide QRS complex tachycardias. For example, Supraventricular Tachycardia (SVT) is characterized by a narrow QRS complex because it originates above the ventricles and conducts normally through the His-Purkinje system. Atrial Fibrillation usually presents with an irregularly irregular rhythm and narrow QRS complexes, although it can have wide complexes if there are pre-existing conditions. Ventricular Flutter is a rapid, chaotic form of VT but is less common. Understanding the characteristics of