Bundle Branch Block

Question 1

what does the Bundle of His separate into?

Answer 1

right and left branches

Question 2

what does the left branch separate into?

Answer 2

anterior and posterior hemi-bundle

Question 3

which two leads to look at to determine BBB

Answer 3

V1

V6

Question 4

criteria for BBB

Answer 4

QRS has to be >120ms (0.12s)

Question 5

pneumonic for BBB

Answer 5

WilliaM MorroW

Question 6

ECG findings in left anterior hemiblock

Answer 6

left axis deviation
R waves in inferior leads
V1 and V2 are down

Question 7

ECG findings in right anterior hemiblock

Answer 7

right axis deviation
S1 Q3 pattern
normal or slightly prolonged QRS

Question 8

V1 and 2 in RBBB

Answer 8

positive/ up

Question 9

which way does the septum depolarise?

Answer 9

left to right

Question 10

what are the fascicles?

Answer 10

AV node
LAHB
LPHB
RBB

Question 11

what is a bifasicular block?

Answer 11

blockage of 2 of the fascicles

Question 12

ECG findings in bifascular block

Answer 12

2 of:

• PR >200ms
• left axis deviation
• RBBB

Question 13

ECG findings in trifasicular block

Answer 13

PR >200ms
left axis deviation
RBBB
alternating RBBB and LBBB

Question 14

define aberrancy

Answer 14

not over the normal conducting system