A case of a permanent form of junctional reciprocating tachycardia with negative linking on atrial differential pacing.

This case of PJRT shows negative linking on ventriculoatrial intervals after atrial differential pacing. Interpreting the results of atrial differential pacing may be challenging in cases where the pacing site affects retrograde conduction or when retrograde conduction is unstable.

A case of retractable helix lead auto-retraction: A possible cause of deep septal lead dislodgement.

This paper explains the phenomenon where the helix lead automatically retracts because of residual torque during deep septal pacing.