DFT Flashcards
Whats the safety margin for DFT
10J
Two types of VF induction
Shock on T
High Frequency Burst
Which two trials spoke against DFT testing
Nordic - First shock efficacy same
SIMPLE - Similar arrhythmic deaths
What is a class IIa indication for DFT
Right sided implant
3 ways to manage DFT
Change vectors
Implant equipment
Increase energy
In biotronik is the Can ANODE or CATHODE
Anode
Time based waveforms are more efficient than voltage based waveforms - TRUE or FALSE
True - hence biphasic 2 (2ms chop off in the end)
During DFT testing - what is the detection?
Same as programmed detection 18/24 normal
Deliver emergency shock is what type of shock?
Committed - asynchronous
Under what circumstance is ATP OPT cleared and reset
Shock delivery or reprogramming
Does ATP OPT apply to the VF zone?
No - Only VT zones
What is the minimum ATP interval available
200ms
What did PAINFREE show?
ATP terminates 3 out of 4 FVT painlessly
What is the criterion for ATP ONESHOT
In the VF zone
Stability of +-12 must be met - not programmable
Does ONESHOT occur pre or during charging
Pre
Reconfirmation is how many of how many
3 of 4
What does surge guard do?
Cuts off accelerating therapy mid-episode
Does surge guard temp or perm program off pro arrhythmic therapy
Temporarily.
It’ll be back on for the next episode
What did surge guard use to be called?
Therapy ratchet
How much % of charge is delivered during both phase 1 and phase 2 of shock
Phase 1 = 60%
Phase 2 = 50% of whats left
Whats the cut off voltage % of a biphasic shock
20%
Does the ICD and SVC Coil share the same polarity?
Yes - both Anodal
When is the polarity reversed during alternating shock sequence?
Polarity is reversed after the first FULL shock
Is the shock following an abort committed or non committed?
Commited
Whats the shock abortion criteria
12/16
If committed the shock will delivery on next sync-able TACHY R-wave. If one comes, what will happen?
Will wait for 2s and then deliver regardless
Shock confirmation takes place during DFT testing - TRUE / FALSE
FALSE
As many aborted shocks as you like
What does Progressive course of therapy ensure
ATP will NEVER follow shocks in the same episode
Shock energy will NEVER DECREASE in an episode
What must be programmed to prevent non-treatable VT
Shocks within the VT zone - never programme just ATP due to progressive course of therapy
How long does post shock blanking last
1 second
