Bundle Branch Blocks

Question 1

LBBB ECG key findings

Answer 1

tall, notched R wave in lateral leads; deep S in V1-3, prolonged QRS

Question 2

RBBB ECG key findings

Answer 2

notched R wave in V1-3; wide, slurred S wave in lateral leads, prolonged QRS, possible ST depression and T wave inversion in right precordial leads

Question 3

Heart sound indicative of a BBB

Answer 3

split S2

Question 4

causes of RBBB

Answer 4

cor pulmonale, ASD, PE, HTN, MI, myocarditis, rheu1matic heart disease

Question 5

causes of LBBB

Answer 5

dilated cardiomyopathy, myocarditis, HTN, anterior MI, aortic stenosis, hyperkalemia

Question 6

number of fascicles in right bundle branch

Answer 6

1

Question 7

number of fascicles in left bundle branch

Answer 7

2: anterior and posterior

Question 8

Answer 8

RBBB

Question 9

Answer 9

LBBB