In persistent tachyarrhythmia causing hypotension, the first line of treatment is not adenosine; what is the recommended next step?

In persistent tachyarrhythmia causing hypotension, the first line of treatment is not adenosine; what is the recommended next step?

• A. Adenosine 6 mg IV/IO
• B. Immediate synchronized cardioversion
• C. Vagal maneuvers
• D. Observation

Answer: (B)

When a tachyarrhythmia is causing hypotension, the patient is hemodynamically unstable and needs immediate intervention to restore a perfusing rhythm. Adenosine works by briefly blocking AV node conduction and is most helpful for stable, narrow-complex SVTs. It can fail to improve perfusion in unstable patients and, in some cases, can worsen the situation or provoke adverse effects. Vagal maneuvers are often ineffective in unstable tachyarrhythmias and simply delay definitive care. Observation does not address the jeopardized perfusion. The fastest, most reliable way to terminate a tachyarrhythmia and restore cardiac output in this scenario is synchronized cardioversion, which delivers a shock timed to the QRS complex to terminate the rhythm while preserving the rhythm’s synchronization to avoid inducing ventricular fibrillation.

When a tachyarrhythmia is causing hypotension, the patient is hemodynamically unstable and needs immediate intervention to restore a perfusing rhythm. Adenosine works by briefly blocking AV node conduction and is most helpful for stable, narrow-complex SVTs. It can fail to improve perfusion in unstable patients and, in some cases, can worsen the situation or provoke adverse effects. Vagal maneuvers are often ineffective in unstable tachyarrhythmias and simply delay definitive care. Observation does not address the jeopardized perfusion. The fastest, most reliable way to terminate a tachyarrhythmia and restore cardiac output in this scenario is synchronized cardioversion, which delivers a shock timed to the QRS complex to terminate the rhythm while preserving the rhythm’s synchronization to avoid inducing ventricular fibrillation.