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Conduction issues Flashcards

(7 cards)

1
Q

List the ECG criteria for a LBBB.

A
  • QRS >0.12s
  • V1-2: deep, broad S-wave (or w-shaped qS wave)
  • V5-6, I and aVL: broad, “clumsy” completley positive R-wave
  • Discordant ST elevation and depression
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2
Q

List the ECG criteria for a RBBB.

A
  • QRS >0.12
  • V1-2: RsR’ pattern (R’ almost always larger
  • V5-6, I and aVL: Broad S-wave
  • Downsloping ST in V1-2 +/- inverted T-waves.
  • T-waves positive in lateral leads
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3
Q

List the ECG criterior for a LAFB.

A
  • LAD
  • Lateral leads: qR
  • Inf’r leads: rS
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4
Q

List the ECG criterior for a LPFB.

A
  • RAD
  • Lateral leads: rS
  • Inferior leads qR
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5
Q

What is bifascicular block?

A

Either:

  • LAFB + RBBB or
  • LPFB + RBBB
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6
Q

What is tri-fascicular block?

A

1`HB + LAFB/LPFB + RBBB

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7
Q

List the types of heart block.

A
  • First degree - PR > 200ms - all PR comlexes -> QRS
  • Second degree: some PR complexes -> QRS
    • Mobitz Type 1 - Wenkebach - ing’g duration of PR intervals
    • Mobitz Type 2 - constant PR intervals with dropped beats
  • Third degree: no Pr complexes -> QRS - AV dissociation
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