How is stable SVT typically managed in the ED?

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Multiple Choice

How is stable SVT typically managed in the ED?

In stable SVT, the goal is to terminate the tachycardia quickly with the least risk to the patient. The first step is vagal maneuvers, such as the Valsalva maneuver or carotid sinus massage when appropriate, because these actions activate the parasympathetic system and slow conduction through the AV node. Slowing AV nodal conduction can interrupt the reentrant circuit causing the tachycardia, converting the rhythm to normal sinus rhythm without drugs or anticoagulation. If vagal maneuvers don’t work, the next step is a rapid IV adenosine. Its effects are ultra-short-lived, which makes it a safe, diagnostic, and often curative option for many forms of SVT that depend on AV nodal conduction (like AVNRT and AVRT). The typical approach starts with a 6 mg IV push; if there’s no conversion, a second dose of 12 mg IV push is given. Because adenosine can cause bronchospasm, especially in patients with asthma or COPD, monitoring is essential and be prepared to manage airway symptoms. If conversion still hasn’t occurred and the patient remains stable, other pharmacologic options or pacing strategies may be considered, but the standard ED sequence for a stable patient is vagal maneuvers followed by adenosine. Immediate synchronized cardioversion is reserved for instability, not for a stable tachycardia.

In stable SVT, the goal is to terminate the tachycardia quickly with the least risk to the patient. The first step is vagal maneuvers, such as the Valsalva maneuver or carotid sinus massage when appropriate, because these actions activate the parasympathetic system and slow conduction through the AV node. Slowing AV nodal conduction can interrupt the reentrant circuit causing the tachycardia, converting the rhythm to normal sinus rhythm without drugs or anticoagulation.

If vagal maneuvers don’t work, the next step is a rapid IV adenosine. Its effects are ultra-short-lived, which makes it a safe, diagnostic, and often curative option for many forms of SVT that depend on AV nodal conduction (like AVNRT and AVRT). The typical approach starts with a 6 mg IV push; if there’s no conversion, a second dose of 12 mg IV push is given. Because adenosine can cause bronchospasm, especially in patients with asthma or COPD, monitoring is essential and be prepared to manage airway symptoms.

If conversion still hasn’t occurred and the patient remains stable, other pharmacologic options or pacing strategies may be considered, but the standard ED sequence for a stable patient is vagal maneuvers followed by adenosine. Immediate synchronized cardioversion is reserved for instability, not for a stable tachycardia.

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