Sensing

Question 1

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

Answer 1

Max = 100% of R-wave

UT = 50% of Max

LT = 25% of UT

MT - 0.8mv (Programmable)

Question 2

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

Answer 2

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

LT decays every 156ms by 12.5% to MT

Question 3

What are the 3 sensing scenarios of ICDS

Answer 3

STD // TWS // VFS

TWS has higher UT at 75% of Max

VFS has shorter UT duration at 110ms

Question 4

What is the sampling rate in ICDS

Answer 4

8192Hz

recordings are stored at 128Hz

Question 5

What are the minimum acceptable sensing values

Answer 5

P wave 2mV

R wave 5mV

Question 6

VF is what type of counter

Answer 6

x in y or probabilistic NORM 8/12

Question 7

VT1 counter has to be more than VT2 until what device

Answer 7

Ilsesto

Question 8

Is there re-detect in the monitor zone?

Answer 8

No - no re-detect

Question 9

What is termination in a monitor zone

Answer 9

5 sinus or VP beats

Question 10

Is ONSET used for re detect

Answer 10

No - only on initial

Question 11

Whats onset nominally set to in single chamber ICD

Answer 11

20%

Question 12

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

Answer 12

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

Question 13

Sustained high rate is what

Answer 13

Safety timer to overrule therapy inhibition

Question 14

What is termination detection

Answer 14

12/16 beats slower than the slowest tachy limit

Question 15

VF reduction in ilesto and prior vs Iperia and beyond

Answer 15

ILESTO = same X out of Y as initial

IPERIA = Separate X out of Y as initial

Question 16

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

Answer 16

Programming activates ICD

Wand application inhibits ICD detect and therapy

Question 17

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

Answer 17

Programming doesn’t activate ICD

Wand application doesn’t inhibit detect and therapy