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Ep Flashcards

1
Q

Pa interval?

A

Earliest activation in sinus node region and region of av node

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2
Q

What does a prolonged PA interval indicate?

A

Delay in intra-atrial conduction(usually do to atrial dx or drugs)

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3
Q

Pa interval in ms?

A

25-55ms

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4
Q

What does AH interval duration time measure?

A

Time taken for cardiac impulse to travel over av node

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5
Q

Normal AH interval?

A

45-150ms

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6
Q

Normal PR interval time?

A

80-140ms

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7
Q

What causes conduction in AV node to vary?

A

Cycle length because of decremental properties

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8
Q

Total conduction time over His bundle should be <

A

<30ms

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9
Q

Hv interval is?

A

Conduction over specialized fibers of purkinje system

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10
Q

How is HV measured?

A

His bundle electrogram to earliest recorded ventricular activation

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11
Q

HV interval in ms?

A

35-55ms

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12
Q

QT measured in?

A

QTc

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13
Q

Bazette formula

A

QTc=QT/ square root RR

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14
Q

What is a normal QRS

A

< or = 100ms

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15
Q

Normal QTc for men and women

A

440ms for men
460ms for women

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16
Q

2 test sinus node function tests for bradycardia

A

SNRT
SACT

17
Q

CSNRT

A

SNRT-SCL

18
Q

Reasonable values

A

SNRT<1500ms max CSNRT <550ms and TRT <5s

19
Q

Why causes the av node to decrement?

A

Slow inward calcium channels

20
Q

What specialized conducting fibers of His-Purkinje system make it less decremental

A

Fast sodium channels

21
Q

What V extra stim used for?

A

Determine retrograde conduction, detect accessory pathways, and arrhythmia induction

22
Q

Venoatrial conduction over the node

A

Either baseline or with Isuprel or atropine

23
Q

What V stim concentric atrial activation

A

CS activation proximal to distal, HRA at least 30ms after atrial electrogram registered by His bundle catheter

24
Q

Eccentric retrograde atrial or VA conduction that is non-decremental or shows discontinuity may indicate

A

Accessory path or dual av nodal pathway

25
Q

What rate do you do incremental ventricular pacing

A

Slightly faster than sinus rate down to VA wcl or minimum cl of 300 ms

26
Q

What is unlikely if VA conduction is completely absent

A

AV reentry
AVNRT

27
Q

Programmed V stim using multiple exrastimuli (short-long-short) may facilitate

A

BBB reentry

28
Q

How can you differentiate between aflutter and Atach

A

P wave cycle length on surface ekg

29
Q

Atach cl

A

250-500ms (120-140 beats/min)

30
Q

Cycle length <220ms and rate >270 beats/min

A

Aflutter

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