Quiz

10 things you need to know about Vp suppression

  1. the AAI-DDD (Vp-suppression) mode has been designed to allow pacing in ADI mode with permanent monitoring of atrioventricular conduction and switching to DDD mode when the device detects an alteration in atrioventricular conduction
  2. there are 4 switching criteria from AAI to DDD corresponding to the different degrees of atrioventricular block
  3. first-degree AV block: the device switches to DDD mode when 2 consecutive atrial events are conducted with an AS-VS or AP-VS delay exceeding 450 ms
  4. second-degree AV block: the device switches to DDD mode when X (programmable) out of 8 atrial events are blocked
  5. third-degree AV block: the device switches to DDD mode when 2 consecutive spontaneous or paced atrial activities are blocked
  6. ventricular pause: the device switches to DDD mode when the interval between 2 sensed ventricular activations exceeds 2 seconds
  7. when the device is operating in DDD mode, it searches for the presence of a spontaneous atrioventricular conduction every 30 seconds and subsequently spaces the latter (1, 2, 4, 8, 16 … 128 minutes, up to 20 hours) if the search is inconclusive
  8. the device prolongs its AV delay to 450 ms for 8 cycles
  9. the search is successful and the device switches to ADI mode if the set number of ventricular cycles (nominal value 6) has been sensed consecutively within 8 cycles
  10. during the search, no P wave can be blocked but there is an increased risk of pacemaker mediated tachycardia

10 things you need to know about Vp suppression