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Biotronik Tachy > Sensing > Flashcards

Flashcards in Sensing Deck (17)
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1
Q

What % values are the Max, Upper threshold, Lower threshold and Minimum threshold

A

Max = 100% of R-wave

UT = 50% of Max

LT = 25% of UT

MT - 0.8mv (Programmable)

2
Q

What are the STD. degradation times from UT to LT and LT to MT

A

UT - LT takes 350ms (400ms during pace)

LT decays every 156ms by 12.5% to MT

3
Q

What are the 3 sensing scenarios of ICDS

A

STD // TWS // VFS

TWS has higher UT at 75% of Max

VFS has shorter UT duration at 110ms

4
Q

What is the sampling rate in ICDS

A

8192Hz

recordings are stored at 128Hz

5
Q

What are the minimum acceptable sensing values

A

P wave 2mV

R wave 5mV

6
Q

VF is what type of counter

A

x in y or probabilistic NORM 8/12

7
Q

VT1 counter has to be more than VT2 until what device

A

Ilsesto

8
Q

Is there re-detect in the monitor zone?

A

No - no re-detect

9
Q

What is termination in a monitor zone

A

5 sinus or VP beats

10
Q

Is ONSET used for re detect

A

No - only on initial

11
Q

Whats onset nominally set to in single chamber ICD

A

20%

12
Q

Stability is nominally 24ms which is tight - 48ms is better

A

If stable probably VT - VT is rarely 24ms stable though

13
Q

Sustained high rate is what

A

Safety timer to overrule therapy inhibition

14
Q

What is termination detection

A

12/16 beats slower than the slowest tachy limit

15
Q

VF reduction in ilesto and prior vs Iperia and beyond

A

ILESTO = same X out of Y as initial

IPERIA = Separate X out of Y as initial

16
Q

Old LUMAX 3 and 5 what happens with programming and wand application

A

Programming activates ICD

Wand application inhibits ICD detect and therapy

17
Q

Lummox 640/740, iforia and ilesto what happens with programming and wand application

A

Programming doesn’t activate ICD

Wand application doesn’t inhibit detect and therapy