Supraventricular Tachycardia
Supraventricular Tachycardia Introduction Tachycardia refers to a heart rate >100 beats per minute (bpm). The tachycardia may be supraventricular or ventricular depending on the origin of the arrhythmia. Supraventricular Tachycardia (SVT): If the tachycardia originates above the bifurcation of the bundle of His, usually in the atria or atrioventricular (AV) junction, the tachycardia is supraventricular. Supraventricular impulses follow the normal AV conduction system, activate the ventricles synchronously and will have narrow QRS complexes measuring <120 milliseconds. The QRS may be wide if there is pre-existent bundle branch block, ventricular aberration, or the impulse is conducted through a bypass tract. Ventricular … Read more