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EP > Intracardiac Intervals > Flashcards

Intracardiac Intervals Flashcards

1
Q

What is the normal PA interval Range

A

20-40msec

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2
Q

What is the normal AH interval

A

50-120 msec

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3
Q

What affects AH interval

A

Autonomic tone, drugs, pacing

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4
Q

What causes prolongation of the PA interval

A

Disease of Atrium or Drugs

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5
Q

What is a normal HV interval

A

35-55msec

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6
Q

What 3 signals make up the PR interval

A

PA + AH + HV

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7
Q

How is the AH interval measured?

A

A to HIS spike

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8
Q

What does the AH interval represent?

A

AV Node conduction time

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9
Q

What does the PA interval represent

A

Intra-atrial conduction time

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10
Q

How is the PA interval measured

A

P to A on His catheter

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11
Q

What does the steady lengthening of AH interval represent

A

Decremental conduction

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12
Q

Do accessory pathways decrement?

A

No - They’re all or nothing

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13
Q

‘Longest coupling interval that cannot initiate depolarisation’ - Describes……

A

Effective refractory period

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14
Q

‘Longest coupling interval that that still depolarises…. but gives slowed conduction’ - Describes……

A

Relative refractory period

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15
Q

‘Smallest possible time between two conducted impulses’ - Describes…….

A

Functional Refractory period

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16
Q

Does the effective refractory period decrease at faster rates - YES/NO

A

Yes - Refractory rates decrease with quicker HR’s

17
Q

What is the normal effective refractory period of the Atrium

A

170 - 300ms

18
Q

What is the effective refractory period of the AVN

A

230 - 430ms

19
Q

What is the functional refractory period of the AVN

A

330ms - 500ms

20
Q

What is the effective refractory period of the Ventricle

A

180 - 280ms

21
Q

What is a normal SNRT

A

<1500ms

22
Q

How do you calculate cSNRT

A

SNRT - BCL

23
Q

What is a normal cSNRT

A

<525ms

24
Q

What are the positions in a 4 wire study

A

HRA
HIS
CS
RVA

25
Q

Where is the HRA and what does it give you

A

High RA / Gives you SN information and BCL

26
Q

Where is the HIS and what does it give you

A

Straddles TV - Records A, H and V signals

27
Q

Where is the CS and what does it give you

A

CS or AV Groove - Records LA & LV signals

28
Q

Where is the RVA and what does it give you

A

RV Apex - Records RV signals

29
Q

How do you measure BCL

A

A to A signal on HRA catheter

30
Q

What does the HV interval represent

A

Time in His-Purkinje system

31
Q

How do you measure the HV interval

A

H signal to earliest V

EP (8 decks)

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