Bundle Branch Blocks - EKGs

Question 1

2 reasons for a prolonged/late intrinsicoid deflection

Answer 1

• Bundle branch block

- Ventricular enlargement

Question 2

2 common features in BBB

Answer 2

• Wide QRS (> 0.12 sec or 3 small boxes)

- T wave slopes off opposite to QRS

Question 3

RBBB - EKG

Answer 3

• V1, V2 = RSR’ (Septum –> LV –> RV)

- 1, L, V5, V6 = S wave (RV after LV)

Question 4

LBBB - EKG

Answer 4

• V1, V2 = Negative (QS) (Septum R –> L cancels RV)

- V5, V6 = Positive, notched, monophasic (Septum cancels RV)

Question 5

Causes of LBBB

Answer 5

HTN, ischemia, AS, cardiomyopathy

Question 6

See LBBB + RAD…

Think ____

Answer 6

Dilated (congestive) cardiomyopathy