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Biotronik Tachy > Morphmatch > Flashcards

Flashcards in Morphmatch Deck (16)
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1
Q

Can Morphmatch be used in atrial based detection?

A

No ventricular detection only

2
Q

Is morphmatch compatible with SMART

A

No - SMART must be off

3
Q

What two algorithms must be satisfied before morphmatch kicks in

A

Onset and Stability

4
Q

What is the purpose of Morphmatch

A

To distinguish SVT from VT

5
Q

Is it available in HF CRT devices?

A

Yes - but only if LV sensing is off

6
Q

Why must LV sensing be off for morphmatch to work

A

Because template is rolling - thus need constant intrinsic. Which reduces CRT pacing. Not like wavelet

7
Q

Morphmatch is available in which zone

A

VT1 and VT2

8
Q

3 ways it distinguishes morphology

A

Maximum Spike

Area

Vector

9
Q

How many beats to build a template and what beats don’t count

A

32

Anything over 100bpm and ectopics

10
Q

When is morphology reset

A

Daily // After reprogramming // Tachy Rx or periods of excessive variation

11
Q

What is the morphology sampling rate

A

128hz (8ms)

12
Q

What is the nominal SVT detection and can this be programmed

A

No programming - Double VT counter

13
Q

If there is 1 unstable beat - how much does morphmatch drop the detection counter?

A

By 20 - old devices used to start over again

14
Q

Morphmatch limitations

A

Only for initial detection
Rate dependent BBB will throw it
Paced rhythm - can’t initialised
Cant be used with SMART

15
Q

What are the 3 thresholds for morphmatch and their values

A

Low = 28 (More sensitive)

Std = 36

High = 42 (More specific)

16
Q

Morph counter must be below what % of VT counter to be classified as SVT

A

50%