ECG Interpretation: AV Nodal Re-entrant Tachycardia

Understanding the underlying mechanism of AVNRT: when an unfortunately timed atrial ectopic and two strands of conducting tissue with opposite electrical properties in the junctional region of the heart establish a rapidly discharging, self sustaining, re-entrant loop of depolarising current, which will be discharged distally into the ventricles and atria.

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