mjl1717
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1) LBBB
2) L. axis deviation
3) L. ant. fasicuar block
4) Mobitz II block
5) Wenckebach block
6) L. post fasicular block
a) QRS is up in lead 1 and down in aVF
b) progressive prolongation of PR interval
c) QRS is up in V1 and down in V3-V6
d) could be at a 3:1 or 4:1 ratio
e) (LAD ) small Q wave in lead I and a S wave in lead III
f) somewhat mimics P.E. on EKG (S1Q3)
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| mjl1717
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Geez lets go guys!! you think this is difficult just wait for PGY 1
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| mjl1717
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any cardiac masters in the house?
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| webjeee
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only know
2a
5b
do we need to know that much?
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| mjl1717
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Yes webjee. At least you had the intestinal fortitude to try. Other answer are:
1c,
3e
4d
6f
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| vrach
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Have a couple of Q's/issues with the answers. Please clarify:
1. doesn't LBBB usually present with a wide QRS complex (>0.12 sec for complete block) with a QS in the right chest leads (negative QRS in V1) and a tall wide R wave without a Q wave in in V6 (positive QRS complexes in the left chest leads), with notching at the tips of the QS and R waves.
2. L. anterior fasicular block (LAFB) causes a left axis deviation (a mean electirical axis of the heart that is more than -45 degrees is diagnositc of LAFB). So shouldn't answer choices (a) and (e) be applicable to both LBBB and LAFB.
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| mjl1717
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yes vrach you are correct for LBBB, I made an error with that-QRS is inverted in V1 and in V6 there is RsR.......... also you are probably correct about answer a and answer e.
This q has been here for 9 days , the others except you and webjee didnt have any guts.. thanks for responding..I need to be corrected too cause this aint no joke (it can get lonely out here in usmle land)... esp on this topic.. Good heads up! 
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