Which statement best describes management of tachyarrhythmia with hemodynamic instability?

Which statement best describes management of tachyarrhythmia with hemodynamic instability?

• A. Adenosine is the preferred initial therapy
• B. Immediate synchronized cardioversion
• C. Vagal maneuvers alone are sufficient
• D. Observe and monitor only

Answer: (B)

When a tachyarrhythmia causes signs of poor perfusion or shock, the priority is to restore blood flow quickly. In this unstable situation, an immediate synchronized electrical shock is the best choice because it rapidly resets the heart rhythm while preserving a pulse. The synchronization prevents delivering a shock during the vulnerable part of the cycle, which helps avoid worsened arrhythmia. Adenosine and vagal maneuvers are useful mainly for stable, narrow-complex tachycardias, and they can delay definitive treatment in someone who is unstable. Observation alone does nothing to correct the dangerous hemodynamic instability. If there were no pulse, you would use unsynchronized defibrillation instead of synchronized cardioversion.

When a tachyarrhythmia causes signs of poor perfusion or shock, the priority is to restore blood flow quickly. In this unstable situation, an immediate synchronized electrical shock is the best choice because it rapidly resets the heart rhythm while preserving a pulse. The synchronization prevents delivering a shock during the vulnerable part of the cycle, which helps avoid worsened arrhythmia.

Adenosine and vagal maneuvers are useful mainly for stable, narrow-complex tachycardias, and they can delay definitive treatment in someone who is unstable. Observation alone does nothing to correct the dangerous hemodynamic instability. If there were no pulse, you would use unsynchronized defibrillation instead of synchronized cardioversion.