MVP Flashcards
What does MVP stand for?
Managed Ventricular Pacing
How does MVP work?
- looks for loss of ventricular conduction
- an A-A interval with NO V-sense will result in a ventricular pace 80ms after the next scheduled AP
- allows for V-V cycle variations and occasional pauses up to 2x the LR plus 80ms
What should be done for a patient with sinus bradycardia or frequent loss of conduction to prevent long pauses in the V-V interval when programmed to MVP mode?
program the lower rate to 50bpm or higher prevents long V-V interval pauses
What is required for the mode to remain in AAI(R) mode while programmed to MVP?
- need a VS event within every A-A interval
- time of VS or the length of the AV delay does not matter so long as a VS comes inbetween A-A intervals
When is MVP programming not appropriate?
- for patients with symptomatic 1st degree AV block
- complete heart block
- symptomatic rate-dependent AV block
- suspected pause-dependent VT with no ICD backup
When will MVP provide a backup VP?
- 80ms after the next schedule AP or A-A escape interval
MVP allows for V-V cycle variations and occasional V-V pauses of what length?
- 2x the LR plus 80ms
What does the MVP algorithm consider temporary loss of conduction?
when conduction loss occurs in 1 of the last 4 beats, stays in AAI(R)
What does the MVP algorithm consider permanent loss of conduction?
when conduction loss occurs in 2 of the last 4 beats, switches to DDD(R)
When and how does MVP know to switch back to AAI(R) from DDD(R)?
algorithm conducts periodic one cycle conduction checks starting 1 min after switching to DDD(R), then doubles time up to 16hrs, then checks every 16hrs
What happens if the patient has MVP mode on and experiences AFib?
- device will mode switch to DDIR until the episode terminates, then switches to DDD(R)
- will perform a conduction check 1 min after switching to DDD(R) at termination of the episode
During an AT/AF episode, Mode Switch will force the mode to DDIR from AAI(R), DDD(R) or both?
both AAI(R) and DDD(R)
How often does MVP perform conduction checks?
- starts 1 minute after switching to DDD(R), then doubles in time for every failed test up to 16hrs, then q16hrs after
- 1, 2, 4,……16hrs, q16hr
MVP can reduce RV pacing to what percentage/
< 5%
What is the Atrial Refractory Period when the HR is < 75 bpm and the device is operating in MVP mode?
600 ms