JBL EMT Practice Exam

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Which of the following cardiac dysrhythmias has the greatest chance of deteriorating into a pulseless rhythm?

  1. Extra ventricular beats

  2. Sinus bradycardia

  3. Sinus tachycardia

  4. Ventricular tachycardia

The correct answer is: Extra ventricular beats

Extra ventricular beats have the greatest chance of deteriorating into a pulseless rhythm because they can progress into more severe dysrhythmias such as ventricular tachycardia or ventricular fibrillation, which are both life-threatening and can lead to cardiac arrest. Sinus bradycardia and sinus tachycardia, while abnormal, do not necessarily indicate an immediate risk of deteriorating into a pulseless rhythm. Ventricular tachycardia itself is already a more serious dysrhythmia but does not pose as great a risk of deterioration compared to extra ventricular beats.

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