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Response to atrial overdrive pacing in JET: after termination of pacing, the first return beat (arrhythmia) begins with an H followed by an A (A‐H‐H‐A response). (A, atrium; ACL, arrhythmia cycle length; AVN, atrioventricular node; FP, fast pathway; H, His; PCL, pacing cycle length; RCL, return cycle length; V, ventricle)
