Conduction issues Flashcards
(7 cards)
List the ECG criteria for a LBBB.
- 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
List the ECG criteria for a RBBB.
- 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
List the ECG criterior for a LAFB.
- LAD
- Lateral leads: qR
- Inf’r leads: rS
List the ECG criterior for a LPFB.
- RAD
- Lateral leads: rS
- Inferior leads qR
What is bifascicular block?
Either:
- LAFB + RBBB or
- LPFB + RBBB
What is tri-fascicular block?
1`HB + LAFB/LPFB + RBBB
List the types of heart block.
- 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