Define pullback: spacing between the tip and distal end of the RV coil.

• A. 17 mm
• B. 5 mm
• C. 25 mm
• D. 50 mm

Answer: (A)

Pullback is the spacing along the ICD lead between the tip electrode and the distal end of the right ventricular (RV) defibrillation coil. This distance defines how far the coil sits from the tip, which helps determine the defibrillation vector and ensures the shock is delivered effectively within the heart while staying within the lead’s intended geometry. For the lead in question, that spacing is 17 millimeters, making it the best answer because it reflects the specified pullback distance built into the lead design. Distances like 5 mm would place the coil much closer to the tip than intended, while 25 mm or 50 mm would place it much farther away, deviating from the designed pullback and potentially altering the shock vector and lead performance.