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  • Heart rate greater than 100 bpm.

  • Rhythm is supraventricular in origin.

General Considerations

Supraventricular tachycardias (SVTs) are rapid rhythm disturbances originating from the atria or the atrioventricular (AV) node. In the absence of a bundle branch block, there is intact conduction to the ventricles via the right and left bundles leading to a narrow and normal-appearing QRS. Therefore, these arrhythmias are also often called narrow complex tachycardias. Because many of the SVTs are episodic, many clinicians also refer to this group of arrhythmias as paroxysmal SVTs. Radiofrequency ablation has become an important therapeutic option in the management of SVTs because of its ability to cure these arrhythmias safely. Table 11–1 outlines the pharmacologic therapy for SVTs.

Table 11–1.Antiarrhythmic Drugs for Supraventricular Tachycardias

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