**Core Concept**
Broad complex tachycardia refers to a cardiac arrhythmia characterized by a wide QRS complex on an electrocardiogram (ECG), typically exceeding 120 milliseconds. This condition often mimics ventricular tachycardia and requires prompt recognition and treatment.

**Why the Correct Answer is Right**
A broad complex tachycardia is usually caused by a re-entrant circuit in the ventricles, often involving the His-Purkinje system. This can result from a variety of mechanisms, including aberrant conduction through a bundle branch block or ventricular ectopic foci. The ECG appearance of broad complex tachycardia is often similar to ventricular tachycardia, but the underlying cause can be different.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not directly related to broad complex tachycardia, as it does not specify a mechanism or cause.
**Option B:** This option may be related to narrow complex tachycardia, such as supraventricular tachycardia, which typically has a narrow QRS complex.
**Option C:** This option is incorrect because it does not specify a cause or mechanism that would result in broad complex tachycardia.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that broad complex tachycardia often requires immediate recognition and treatment, as it may be a life-threatening condition. The presence of a wide QRS complex on an ECG should prompt further investigation and consideration of potential causes.

**Correct Answer:** C.