Sensing Flashcards
What % values are the Max, Upper threshold, Lower threshold and Minimum threshold
Max = 100% of R-wave
UT = 50% of Max
LT = 25% of UT
MT - 0.8mv (Programmable)
What are the STD. degradation times from UT to LT and LT to MT
UT - LT takes 350ms (400ms during pace)
LT decays every 156ms by 12.5% to MT
What are the 3 sensing scenarios of ICDS
STD // TWS // VFS
TWS has higher UT at 75% of Max
VFS has shorter UT duration at 110ms
What is the sampling rate in ICDS
8192Hz
recordings are stored at 128Hz
What are the minimum acceptable sensing values
P wave 2mV
R wave 5mV
VF is what type of counter
x in y or probabilistic NORM 8/12
VT1 counter has to be more than VT2 until what device
Ilsesto
Is there re-detect in the monitor zone?
No - no re-detect
What is termination in a monitor zone
5 sinus or VP beats
Is ONSET used for re detect
No - only on initial
Whats onset nominally set to in single chamber ICD
20%
Stability is nominally 24ms which is tight - 48ms is better
If stable probably VT - VT is rarely 24ms stable though
Sustained high rate is what
Safety timer to overrule therapy inhibition
What is termination detection
12/16 beats slower than the slowest tachy limit
VF reduction in ilesto and prior vs Iperia and beyond
ILESTO = same X out of Y as initial
IPERIA = Separate X out of Y as initial
