Chapter 13

Question 1

RBBB criteria

Answer 1

Prolonged QRS
Slurred S wave in I and V6
rSR’ pattern in V1

Question 2

LBBB

Answer 2

Prolonged QRS
Broad monomorphic R waves in I and V6 with no Q
Broad monomorphic S waves in V1, may have small R wave
SHOULD be discordant
V1 V2 neg V5 V6 and I positive

Question 3

Localized IVCD

Answer 3

Shorter than 0.12, common in lead III. QRS with many peaks, sort of like an RSR’ pattern

Question 4

IVCD

Answer 4

0.12 seconds or wider, but lacking some characteristics of LBBB or RBBB. Typical presentation is QRS in V1 have LBBB (wide, monomorphic, discordant, negative) and V6 looks like a RBBB (wide, slurred S wave) Hyperkalemia is the deadliest cause, or TCA OD

Question 5

LAF innervates

Answer 5

anterior and lateral walls

Question 6

LPF innervates

Answer 6

inferior and posterior walls