Advanced Cardiovascular Life Support (ACLS) Practice Exam

What increases the likelihood of successful conversion of ventricular fibrillation?

1. Providing quality compressions immediately before defibrillation

2. Using ventilations prior to defibrillation

3. Administering antiarrhythmic drugs before shocks

4. Pausing compressions to check rhythm

The correct answer is: Providing quality compressions immediately before defibrillation

Providing quality compressions immediately before defibrillation significantly increases the likelihood of successfully converting ventricular fibrillation. High-quality chest compressions are crucial because they maintain coronary perfusion pressure and improve the chances of a successful defibrillation attempt. When compressions are performed effectively, they help to circulate oxygenated blood to vital organs, including the heart and brain, which can enhance the likelihood that defibrillation will restore a normal rhythm. The effectiveness of defibrillation is highly influenced by the heart's condition at the moment of the shock. If compressions are occurring right before the shock is delivered, it can ensure that blood flow is optimized, potentially improving the heart's responsiveness to the electrical shock. Research supports that compressions before defibrillation can lead to better outcomes in cardiac arrest situations, particularly in cases of ventricular fibrillation. In contrast, prioritizing ventilations prior to defibrillation may delay the delivery of necessary shocks. Similarly, administering antiarrhythmic drugs before delivering shocks may not have the immediate positive impact that effective compressions do. Also, pausing compressions to check the rhythm can be counterproductive, as it interrupts the crucial blood flow, thereby reducing the chances of successful defibrillation. Maintaining continuous compressions is essential for