Sinoatrial nodal reentry tachycardia

* Sinoatrial nodal reentry tachycardia is a rare form of sinus tachycardia.
* Clinical features, particularly abrupt onset, help distinguish it from similar conditions.
* Sinus P waves on electrocardiography are suggestive of the diagnosis.
* Treatment usually consists of pharmacotherapy or radiofrequency catheter ablation.
Differentiating between the sinus tachyarrhythmias carries important therapeutic and prognostic implications.