Which rhythm is described as a lethal arrhythmia indicating extreme myocardial irritability?

Which rhythm is described as a lethal arrhythmia indicating extreme myocardial irritability?

• A. Ventricular Tachycardia
• B. Atrial Fibrillation
• C. Ventricular Fibrillation
• D. Asystole

Answer: (A)

Extreme myocardial irritability in the ventricles leads to chaotic, disorganized electrical activity with no coordinated contractions, which is ventricular fibrillation. This rhythm causes the ventricles to quiver rather than pump, producing effectively no cardiac output and rapidly leading to death if not treated immediately with defibrillation and CPR. While ventricular tachycardia is also dangerous and can be life-threatening, it remains a rapid but more organized ventricular rhythm and does not represent the same chaotic irritability. Atrial fibrillation is an atrial rhythm with irregular rate and rhythm and is not the same reflection of extreme ventricular irritability. Asystole is a flat line with no electrical activity, a different lethal state rather than an arrhythmia driven by ventricular irritability.