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Work > Wavelet > Flashcards

Wavelet Flashcards

1
Q

Is Wavelet applied at detection, redetect or both?

A

only at initial VT/VF detection or NID

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2
Q

How does the Wavelet algorithm collect a template?

A
  • collects and compares 6 R-wave samples to the programmed threshold value
  • device confirms template by comparing R waves q10 secs to the template
  • need 70 out of 100 R-wave matches to confirm the template
  • if unable to confirm, will restart the collection process
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3
Q

How often does the auto-collection feature of wavelet monitor/check R-waves to assess the quality of the stored template?

A
  • assesses 100 R-waves q1000 secs

- if can’t get 70/100 R-wave matches, will recollect template

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4
Q

How many beats does the Wavelet feature evaluate to determine a match percentage?

A
  • looks back 8 beats once NID is met
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5
Q

When will Wavelet withhold therapy?

A
  • if at least 3 of the last 8 R-waves are a 70% or greater match with the store template
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6
Q

What will be seen in the channel marker if Wavelet is withholding therapy?

A

WV

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7
Q

What does a WV in the channel marker mean?

A

the Wavelet has withheld therapy

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8
Q

What does HT in the channel marker mean?

A

indicates the High Rate Timeout timer expired, wavelet and PR-Logic stopped withholding therapy and detection

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9
Q

Which EGM2 source does Wavelet use if RV Lead Noise is programmed ON?

A

CAN to RVcoil or RVcoil to SVC

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10
Q

What would you do if the Wavelet signal amplitude is too small at collection?

A
  • try a changing EGM2 to a different source that does not include the CAN
  • try changing the EGM2 range
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11
Q

What is the nominal setting for the PR-Logic/Wavelet High Rate Timeout?

A

45 seconds

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12
Q

Where is Wavelet programmed on the device?

A

under V. Detection

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13
Q

What is the fastest rate Wavelet will applied and what is the nominally setting?

A

SVT Limit at 260ms

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14
Q

How does the device determine if Wavelet can be applied once the VT/VF NID is met?

A
  • the device looks back at the last 12 V-V intervals and determines a median ventricular cycle length
  • Wavelet is applied if the cycle length is greater than the SVT limit
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15
Q

When collecting a Wavelet template, what is a possible solution if the Peak-Peak R-wave amplitudes are < 3mV on EGM2 and noise is seen?

A

change the EGM2 source

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16
Q

When collecting a Wavelet template, what is a possible solution if the EGM (QRS) signal is clipped or is signal is within 1mV of the EGM2 range?

A

increase the EGM2 range

17
Q

When collecting a Wavelet template, what is a possible solution if the R-wave amplitude is too large at any range?

A

change the EGM source, then reassess beginning with a range of +/- 8 mV

18
Q

Can Wavelet collect a template if the patient is pacing 100% of the time?

A

No, sensing of intrinsic R-waves is required

19
Q

In single/dual chamber devices, is auto-collection for the Wavelet feature nominally on or off?

A

Nominally ON

20
Q

In CRT-D devices, is auto-collection for the Wavelet feature nominally on or off?

A
  • Nominally OFF

- need to manually collect since the device will be pacing 100% of the time

21
Q

How long does it take for the device to confirm the Wavelet template after collection?

A
  • at least 12 min

- longer if intrinsic rhythm has changed since collection

22
Q

How long is the Wavelet auto-collect suspended for when any of the following occurs: tachy episode, system test, EP study, Emergency operation?

A

suspended for 1 hr after termination of the episode or completion of the test/procedure

23
Q

For which patients do you have to manually collect a Wavelet template?

A
  • pts with CRT-D devices

- pts who pace close to 100% of the time

24
Q

At follow/up, how do you confirm that the Wavelet template is consistent with the patients sinus rhythm?

A

Click on the “SHOW Match Scores” on the Wavelet test screen and collect a new template if scores are lest then an 80% match

25
Q

When will Wavelet evaluate the rhythm PR-Logic is also turned on?

A
  • when PR-logic does not classify the rhythm as an SVT and withhold therapy
  • ventricular ≤ atrial rate

Work (42 decks)

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