Sinus node reentrant tachycardia

**Definition:** A reentrant tachycardia within the sinus node/perinodal tissue characterised by abrupt onset/termination, regular cadence, and P-waves consistent with sinus node origin

**Long definition:** Sinus node reentry tachycardia, with rates rarely higher than 180 bpm have the following diagnostic criteria: 1) tachycardia and associated symptoms are paroxysmal, 2) P-wave morphology is identical to sinus rhythm (vector directed from superior to inferior and from right to left), 3) endocardial atrial activation sequence is similar to that of sinus rhythm (high-to-low and right-to-left pattern), 4) induction and/or termination occurs with premature atrial stimuli, 5) termination occurs with vagal maneuvers or adenosine, and 6) induction is independent of atrial or AV-nodal conduction time.