Which statement best describes the Far-Field IEGM vector?

Which statement best describes the Far-Field IEGM vector?

• A. Can to RV coil
• B. SVC coil to can
• C. RV coil to can
• D. LV coil to can

Answer: (C)

The Far-Field IEGM vector is the signal recorded across the chest between distant electrodes, giving a broad view of ventricular activation rather than a local, near-field signal. In a transvenous ICD setup, the most representative far-field ventricular signal comes from the defibrillation coil in the right ventricle to the device can. This RV coil–to–can vector captures the global ventricular depolarization as seen by the generator and is the standard reference for far-field sensing. Coils located in the SVC or LV can provide different, more region-specific far-field signals, but they are not the typical canonical description of the ventricular far-field vector. So the best description is the vector from the RV coil to the can.

The Far-Field IEGM vector is the signal recorded across the chest between distant electrodes, giving a broad view of ventricular activation rather than a local, near-field signal. In a transvenous ICD setup, the most representative far-field ventricular signal comes from the defibrillation coil in the right ventricle to the device can. This RV coil–to–can vector captures the global ventricular depolarization as seen by the generator and is the standard reference for far-field sensing. Coils located in the SVC or LV can provide different, more region-specific far-field signals, but they are not the typical canonical description of the ventricular far-field vector. So the best description is the vector from the RV coil to the can.