VIP algorithm

N° 2
Manufacturer Abbott Device PM Field Pacing Modes
  • 74-year-old man
  • AccentTM DR pacemaker (Abbott) for paroxysmal atrioventricular block
  • Programming of the VIP algorithm
Graph and trace
  • Atrial and ventricular pacing (programmed paced-AV delay 250 ms)
  • VIP algorithm; prolongation of the AV delay by 150 ms (programmable) for 2 cycles
  • Absence of intrinsic ventricular activity and ventricular pacing at the end of the prolonged AV delay (400 ms)
  • Unsuccessful search and return to DDD mode pacing at the programmed AV delay
  • This tracing illustrates the features of the VIP algorithm and its operation in a patient with atrioventricular conduction disorder
  • 3 parameters are programmable
  • The VIP™ Extension which corresponds to the extension of the AV delay applied to the programmed AV delay (paced or sensed) to search for intrinsic conduction; the total value of the AV delay cannot exceed 450 ms
  • The search interval corresponding to the time interval between each intrinsic conduction search which can be programmed to 30 seconds, 1, 3, 5, 10 or 30 minutes; increasing this value avoids iterative searches in a patient with permanent atrioventricular block; decreasing the value avoids unnecessary right ventricular pacing in a patient with short-term paroxysmal conduction disorder
  • The number of consecutive cycles the device extends the AV delay to search for the occurrence of intrinsic conduction is programmable to 1, 2 or 3 cycles
  • It is possible to view the atrioventricular conduction histogram in the pacemaker's memory
  • It is possible to program a specific remote monitoring alert when the percentage of ventricular pacing exceeds a programmable threshold