Ventricular tachycardia is a rhythm characterized by wide, bizarre QRS complexes and frequent ventricular premature contractions in a row. VT may be paroxysmal or chronic and often signifies underlying myocardial disease. Mechanisms include reentry, increased automaticity, and triggered activity. VT is potentially life-threatening, as it can degenerate rapidly to ventricular fibrillation and result in sudden death.

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