Which rhythm is listed among ventricular rhythms as a distinct entity besides VT and VF?

• A. Idioventricular Rhythm
• B. Ventricular Tachycardia
• C. Accelerated Idioventricular Rhythm
• D. Torsades de Pointes

Answer: (D)

Torsades de Pointes is a distinct ventricular rhythm pattern that is recognized beyond the general categories of ventricular tachycardia and ventricular fibrillation. Its hallmark is a polymorphic VT with a wandering, twisting appearance of the QRS complexes around the baseline, giving the rhythm a characteristic “twisting of points.” This pattern reflects a fluctuating ventricular axis and rate, often in the setting of QT interval prolongation.

Why this is the best choice: because Torsades de Pointes is identified as a unique, recognizable ventricular rhythm with specific morphology and clinical implications, separate from the broader labels VT and VF. It frequently arises when the QT interval is prolonged (due to drugs, electrolyte disturbances, or congenital conditions) and can deteriorate rapidly, requiring prompt management with magnesium sulfate, correction of electrolytes, stopping offending agents, and advanced care if the patient becomes unstable.

For context, other ventricular rhythms like idioventricular rhythm or accelerated idioventricular rhythm describe slower or faster ventricular rates and aren’t the same distinctive morphologies as Torsades; they’re different categories of ventricular rhythms, not the twisting-pattern rhythm that defines Torsades de Pointes.