In a tachycardia patient with a heart rate of 180 and no signs of hypoperfusion, the first step of treatment is to perform which maneuver?

• A. Amiodarone administration
• B. Synchronized cardioversion
• C. Beta-blocker administration
• D. Vagal maneuver

Answer: (D)

When a patient has a fast, regular tachycardia but remains hemodynamically stable (no signs of hypoperfusion), the first step is a noninvasive attempt to terminate the rhythm using vagal maneuvers. These actions—such as the Valsalva maneuver or a carotid sinus massage (with caution and only if no carotid disease or stroke risk is present)—increase parasympathetic tone and slow conduction through the AV node. This can terminate AV nodal reentrant tachycardias or other SVTs without drugs or electrical shock, restoring normal rhythm quickly and safely.

If vagal maneuvers fail, the next steps depend on the presumed rhythm: for narrow-complex tachycardias, adenosine is typically considered; for wide-complex or unstable rhythms, synchronized cardioversion is used. In this stable scenario, medications like amiodarone or beta-blockers aren’t first-line choices.