Sinoatrial nodal reentry tachycardia

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Sinoatrial node reentrant tachycardia (SANRT) is caused by a reentry circuit localised to the SA node, resulting in a normal-morphology p-wave that falls before a regular, narrow QRS complex. It is therefore impossible to distinguish on the EKG from ordinary sinus tachycardia. It may however be distinguished by its prompt response to Vagal maneuvers.

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