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Work > Timing Intervals > Flashcards

Timing Intervals Flashcards

1
Q

Which interval prevents double counting of atrial events?

A

Atrial Blanking

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2
Q

What is the nominal setting for the PAV and SAV?

A
  • PAV = 150ms

- SAV = 120ms

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3
Q

The Atrial Blanking period begins with an atrial or ventricular event?

A

atrial event

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4
Q

What is the purpose of the Post Atrial Ventricular Blanking (PAVB) period?

A
  • to prevent crosstalk from AP to ventricular channel

- is part of the ventricular EGM

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5
Q

What event triggers the Post Atrial Ventricular Blanking (PAVB) period?

A

an Atrial Pace (AP)

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6
Q

What is the term for when a lead in one chamber senses an intrinsic cardiac event of a different chamber?

A

far-field

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7
Q

What is the term for when a lead in one chamber senses a Paced event of a different chamber?

A

cross-talk

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8
Q

What is the definition of Far-Field?

A

when a lead in one chamber senses an intrinsic cardiac event of a different chamber

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9
Q

What is the definition of Cross-Talk?

A

when a lead in one chamber senses a Paced event of a different chamber and may inhibit a needed pace

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10
Q

What is the purpose of the Post Ventricular Atrial Blanking (PVAB) period?

A
  • prevents Atrial sensing of vent events

- prevents far-field R-wave sensing

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11
Q

What is the purpose of the Post Ventricular Atrial Refractory Period (PVARP)?

A
  • to prevent rapid pacing of the ventricles in response to atrial tachyarrhythmias
  • prevents PMT
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12
Q

What components make up the Total Atrial Refractory Period (TARP)?

A

SAV and PVARP

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13
Q

How does PVARP prevent PMT?

A
  • atrial events occurring in this period are sensed but not tracked so they don’t reset the SAV/PAV timer
  • no tracking = no high rate pacing of the ventricles
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14
Q

What are the causes of Pacemaker Mediated Tachycardia?

A
  • PVC cause retrograde P-wave that is tracked
  • loss of atrial capture
  • atrial undersensing
  • atrial oversensing
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15
Q

What is the purpose of the Ventricular Refractory Period (VRP)?

A
  • prevents T-wave oversensing
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16
Q

What is the purpose of the Ventricular Blanking (VB) period?

A
  • prevents double counting of ventricular events
17
Q

What is the purpose of the Total Atrial Blanking (TAB) period?

A

atrial events in this period are ignored and not counted for arrhythmia detection purposes

18
Q

What is the Total Atrial Refractory Period (TARP)?

A
  • the highest rate device will track atrial events in the ventricles before 2:1 block occurs
19
Q

What will happen if the below occurs:

- upper tracking rate < atrial rate < TARP rate

A
  • Pacemaker Wenchebach will occur
  • the PAV will get longer until an atrial event falls into the refractory period (AR) and is not tracked and paced by the ventricles
20
Q

What will happen if the below occurs:

upper tracking interval < TARP interval

A
  • Pacemaker Wenchebach will occur

- the PAV will get longer until an atrial event falls into the refractory period (AR) and is not tracked (no VS/VP)

21
Q

What will happen if the below occurs:

TARP < upper tracking interval

A
  • 2:1 block will occur

- every other atrial event will fall into refractory (AR) and not be tracked by the ventricles (no VS/VP)

22
Q

What will happen if the below occurs:

TARP rate < atrial rate

A
  • 2:1 block will occur

- every other atrial event will fall into refractory (AR) and not be tracked by the ventricles (no VS/VP)

23
Q

What will happen if the below occurs:

atrial rate < TARP rate and upper tracking rate

A

1:1 tracking (this is the goal)

24
Q

The Upper Tracking Rate should be programmed _______ than the TARP rate by __________?

A
  • lower

- by at least 30bpm

25
Q

What happens to the HR when 2:1 block occurs?

A

the ventricular HR drops to half of the atrial rate, causing possible negative symptoms

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