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Narrow QRS tachycardia: Orthodromic reciprocating tachycardia using an accessory pathway in Wolff-Parkinson-White syndrome.

Narrow QRS tachycardia: Orthodromic reciprocating tachycardia using an accessory pathway in Wolff-Parkinson-White syndrome.
Narrow QRS tachycardia: Orthodromic reciprocating tachycardia using an accessory pathway in Wolff-Parkinson-White syndrome.

Activation is as follows: atrioventricular node, His-Purkinje system, ventricle, accessory pathway, atria. The P wave closely follows the QRS complex; it is a short RP tachycardia (PR > RP).