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EKG > L5: Intraventricular Conduction Defects > Flashcards

L5: Intraventricular Conduction Defects Flashcards

1
Q

Hallmark of s Bundle branch block

A

Wide QRS > .12 s

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2
Q

Incomplete BBB

A

RR’ configuration with narrow QRS

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3
Q

RBBB is seen in (2)

A

Coronary artery disease

Pulmonary Embolism

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4
Q

What else does a Right BBB have besides a wide QRS?

A

V1→ M-shaped RR’
Lead I, V6→ Wide S wave
ST-T waves in RBBB oriented opposite to the direction of the terminal QRS forces

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5
Q

RBBB with abnormal ST changes means….

A

T wave oriented in same direction as terminal QRS forces in limb leads

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6
Q

What’s the axis in a RBBB?

A

Normal, 0-90

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7
Q

What else does a Left BBB have besides a wide QRS?

A

Leads I+V6→ Wide R wave

V1, V2→ reciprocal, broad, deep S waves (leads over RV)

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8
Q

How can you differentiate hypertrophy from a BBB?

A

QRS < .12s

“incomplete BBB pattern”

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9
Q

a change in the
QRS axis, but the QRS duration is not
prolonged

A

HEMIBLOCK

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10
Q

LAHB axis

A

(-) 45 to (-) 90 = LAD

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11
Q

LPHB axis

A

(+) 120 to (+) 180 = RAD

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12
Q

Other causes of RAD that must be excluded in cases of LPHB

A 
cor pulmonale (RAE)
pulmonary htn
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13
Q

Besides LAD, LAHB shows

A

Lead III→ Deep S waves
Lead I→ Tall R waves
Normal QRS

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14
Q

Beside RAD, LPHB shows

A

Lead III→ Tall R waves
Lead I→ Deep S waves
Normal QRS

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15
Q

LAHB vs LPHB: axis

A

LAHB: strong LAD
LPHB: strong RAD

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16
Q

LAHB vs LPHB: Lead III

A

LAHB: deep S waves
LPHB: tall R waves

17
Q

LAHB vs LPHB: Lead I

A

LAHB: tall R waves
LPHB: deep S waves

18
Q

LAHB vs LPHB: QRS duration

A

Both normal

19
Q

RBBB + LAHB axis

A

Same as LAHB!

(-) 45 to (-) 90 = LAD

20
Q

RBBB + LPHB axis

A

Same as LPHB!

(+) 120 to (+) 180 = RAD

21
Q

Bifascicular block

A

Features of RBBB plus frontal plane features of the fascicular block (axis deviation)

22
Q

Which hemiblock is more commonly seen?

A

LPHB

Including in combination with RBBB

23
Q

When the QRS is prolonged without features of either RBBB or LBBB

A

Nonspecific IVCD

24
Q

Causes of nonspecific IVCD

A

Ventricular hypertrophy (especially LVH)
Myocardial infarction (peri-infarction blocks)
Certain antiarrhythmic drugs→ quinidine, flecainide
Hyperkalemia
Paced complexes

25
Q

Bundle of kent=

A

Wolf parkinson white syndrome

26
Q

James fibers=

A

Lown Ganong Levine Syndrome

27
Q

Delta wave=

A

Wolf parkinson white syndrome

28
Q

Pre-excitation syndromes are marked by

A

Short PR interval

29
Q

Wolf parkinson white syndrome is vulnerable to

A

PSVT

30
Q

Which has a wide QRS, WPW or LGL?

A

Wolf parkinson white syndrome

31
Q

Which has delta waves, WPW or LGL?

A

Wolf parkinson white syndrome

32
Q

You see a short PR interval (

A

Lown Ganong Levine Syndrome

EKG (10 decks)

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