Bundle Branch Blocks

Question 1

Right Bundle branch block axis

Answer 1

usually normal

Question 2

Right Bundle Branch block QRS

Answer 2

wide, tall, notches in V1 and V2. Broad slurred S waves in leads I, V5 and V6

Question 3

Right Bundle Branch Block ST Segment

Answer 3

depressed in V1 and V2 (septal leads)

Question 4

Right Bundle branch block T waves

Answer 4

deflected opposite of QRS

Question 5

Right Bundle Branch Block causes

Answer 5

anterior wall MI, coronary artery disease, HTN, scar tissue post-op, myocarditis, PE, drug toxicity, congenital heart abnormality

Question 6

Left Bundle branch block axis

Answer 6

usually normal

Question 7

Left Bundle Branch block QRS

Answer 7

wide, tall, notched or slurred in leads V5, V6; wide, largely negative rS complexes or entirely negative QS complexes in V1, V2

Question 8

Left Bundle Branch block ST segment

Answer 8

depressed in V5, V6 (lateral leads)

Question 9

Left Bundle Branch block T waves

Answer 9

deflects opposite of QRS

Question 10

Left bundle branch block causes

Answer 10

anterior wall MI, hypertensive heart disease, aortic stenosis, degenerative changes of the conduction system or cardiomyopathy

Question 11

Left anterior hemi block (LAHB) axis

Answer 11

Left axis deviation

Question 12

Left anterior hemi block (LAHB) QRS

Answer 12

tall in left lateral leads; deep S waves in inferior; on the wide end of normal

Question 13

Left anterior hemi block (LAHB) causes

Answer 13

seen in healthy and diseased hearts

Question 14

Left posterior hemiblock LPHB Axis

Answer 14

right axis deviation

Question 15

Left posterior hemiblock LPHB QRS

Answer 15

tall R in inferior leads; deep S waves in left lateral leads; on the wide end of normal

Question 16

Left posterior hemiblock LPHB causes

Answer 16

always associated with heart disease

Question 17

Right Bundle Branch Block

Answer 17

Question 18

Left Bundle Branch Block

Answer 18