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Differential diagnoses of narrow QRS tachycardia include atrial tachycardia (AT), orthodromic reciprocating tachycardia (ORT) via an atrioventricular AP, nodoventricular (NV) pathway, nodofascicular (NF) pathway or His‐ventricular (HV) pathway, and atrioventricular nodal reentrant tachycardia (AVNRT). AP, accessory pathway; AVN, atrioventricular node; FP, fast pathway; SP, slow pathway.
