**Core Concept**
Torsade de pointes is a specific type of polymorphic ventricular tachycardia characterized by a unique electrocardiographic pattern and a high risk of sudden cardiac death. This condition is often associated with a prolonged QT interval, which can be congenital or acquired due to various factors such as medication or electrolyte imbalances.

**Why the Correct Answer is Right**
Torsade de pointes is a type of ventricular tachycardia that arises from a prolonged QT interval, leading to a characteristic "twisting" or "turning" of the QRS complexes on the electrocardiogram. This occurs due to the abnormal repolarization of the ventricular myocardium, which can be triggered by factors such as bradycardia, hypokalemia, or the use of certain medications like QT-prolonging antiarrhythmics. The abnormal repolarization process can lead to the formation of a reentrant circuit, which sustains the arrhythmia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a feature of Torsade de pointes. While Torsade de pointes can be associated with a prolonged QT interval, it is not the only feature of this arrhythmia.

**Option B:** This option is incorrect because it does not accurately describe a feature of Torsade de pointes. Torsade de pointes is not typically associated with a wide QRS complex.

**Option C:** This option is incorrect because it does not accurately describe a feature of Torsade de pointes. While Torsade de pointes can be associated with a rapid ventricular rate, it is not the only feature of this arrhythmia.

**Clinical Pearl / High-Yield Fact**
Torsade de pointes is a medical emergency that requires prompt treatment, often with magnesium sulfate or overdrive pacing, to prevent sudden cardiac death. It is essential for clinicians to recognize the characteristic electrocardiographic pattern of Torsade de pointes and to take immediate action to stabilize the patient.

**Correct Answer:** C. Torsade de pointes is a type of ventricular tachycardia characterized by a unique electrocardiographic pattern and a high risk of sudden cardiac death.