DF-1 and DF-4 defibrillator leads
The industry standards IS-1 and DF-1 enable interchangeability of generators and leads from different manufacturers since the late 1980s. Corresponding defibrillator leads feature two (single-coil lead; one IS-1, one DF-1) or three (dual coil lead; one IS-1 and two DF-1) connectors. The DF-4 standard was introduced in 2010 as a simpler solution with only one connection between lead and device, aiming to reduce material in the pocket, facilitate the implantation procedure, and lowering the risk of lead-to-port mismatch.
Our case demonstrates an important clinical advantage of the older DF1/IS1 standard [7], namely the possibility to simply add a pace/sense lead to overcome the problem of chattering.
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[7] Sticherling C, Burri H. Introduction of new industry standards for cardiac implantable electronic devices: balancing benefits and unexpected risks; Europace (2012) 14, 1081–1086