What is the initial management sequence for unstable wide complex tachycardia?

• A. Amiodarone 150 mg IV over 10 minutes, with consideration of defibrillation if no response
• B. Immediate synchronized cardioversion
• C. Diltiazem bolus
• D. Adenosine

Answer: (A)

Immediate synchronized cardioversion is the correct initial move for unstable wide complex tachycardia because restoring perfusion quickly takes priority when the patient isn’t tolerating the rhythm. In this scenario, a controlled shock timed to the QRS helps convert VT to a stable, perfusing rhythm with the best chance of rapid improvement. Relying on drugs first can delay definitive treatment and may not promptly reverse the hemodynamic compromise.

The other options aren’t appropriate as the first step in this setting. Diltiazem is a calcium channel blocker that targets certain narrow complex tachycardias and can be dangerous in wide complex rhythms, potentially worsening stability. Adenosine is useful for specific narrow complex SVTs but has no role in VT and can provoke harm in wide complex tachycardia. Amiodarone is a potent antiarrhythmic that can be used for VT, but as an initial step in unstable patients, it should follow synchronized cardioversion rather than precede it.

After stabilization with cardioversion, further management with antiarrhythmics may be considered if VT recurs or persists, along with evaluating reversible causes and ensuring ongoing monitoring.