What is the recommended management for an unstable patient with suspected VT or SVT with aberrancy?

• A. Treat as VT with synchronized cardioversion
• B. Administer adenosine first
• C. Start with vagal maneuvers
• D. Observe and reassess

Answer: (A)

In an unstable patient, the priority is rapid restoration of hemodynamic stability. A wide-complex tachycardia could be ventricular tachycardia or a supraventricular tachycardia with aberrant conduction, and when perfusion is compromised, you don’t delay to try to determine the exact rhythm. Synchronized cardioversion delivers a timed electrical shock that can promptly terminate the arrhythmia and improve blood flow, making it the safest and most effective initial treatment in this scenario.

Adenosine is useful for stable, regular, narrow-complex SVTs, but it can be dangerous if the rhythm is actually VT or if the patient is unstable, and it won’t reliably terminate VT. Vagal maneuvers rely on slower, vagal-driven changes and are unlikely to stabilize an unstable patient. Observation, waiting to see what happens, is inappropriate when there is clear hemodynamic compromise. After cardioverting, reassess the rhythm and manage with definitive therapy as indicated.