Registered Cardiovascular Invasive Specialist (RCIS) Practice Test

Which rhythm is most likely to become lethal?

1. Wenckebach

2. Mobitz 2

3. Atrial Flutter

4. Ventricular Fibrillation

The correct answer is: Mobitz 2

The rhythm that is most likely to become lethal is Ventricular Fibrillation. This arrhythmia is characterized by disorganized electrical activity in the ventricles, leading to ineffective contractions and a complete loss of cardiac output. As a result, this condition can lead to sudden cardiac arrest and is typically fatal if not treated immediately with defibrillation. In contrast, while Mobitz type II can progress to a complete block, making it potentially dangerous, it does not have the immediate life-threatening implications associated with Ventricular Fibrillation. Both Wenckebach and Atrial Flutter, while they can cause issues, typically do not lead to immediate lethality compared to Ventricular Fibrillation. Understanding these rhythms and their implications for patient safety is critical, especially in emergency situations where timely intervention may save a life.