Left Bundle Branch Block

Question 1

LBBB features

Answer 1

QRS > 120 ms
I, aVL, V5, V6= NO Q waves
LAD
Lateral leads: Tall R waves
V1-V3= deep S waves
(WILLIAM)
V1- dominant S wave
I, aVL, V5, V6= broad mono phasic R

Question 2

LBBB associated features

Answer 2

Appropriate discordance
poor R wave progression chest leads
LAD

Question 3

LBBB Causes

Answer 3

AMI
Anterior AMI
HTN
Aortic Stenosis
Dilated cardiomyopathy
Hyperkalemia
Digoxin toxicity
Primary degenrative dz