Johnston Bundle Branch Blocks

Question 1

if block of the left bundle then cannot activate that side first, then you lose what

Answer 1

q wave

Question 2

width of qrs in bbb

Answer 2

3 small squares or more

Question 3

intrinsic deflection is the

late in what?

Answer 3

time lapse from beginning of QRS to the peak of the R wave

-late in BBB and hypertrophy/dilated

Question 4

common features of BBB

Answer 4

wide QRS (.12 sec or greater)
ST segment - T wave slope off in opposite direction to QRS

Question 5

RBBB has deep ____ wave on leads ___

Answer 5

S wave on V5 and V6

-bc impulse is slowly wheezling way over to the right side away from the lead

Question 6

LBBB more apt to occur with what

Answer 6

HACI

hypertension
AS
cardiomyopathy
ischemia

Question 7

limb leads in BBB

Answer 7

I and aVL have features of V6

Question 8

T wave polarity in BBB

Answer 8

usually in opposite direction as QRS

if in same direction then called primary T wave change and usually due to ischemia

Question 9

hallmark for left BBB

Answer 9

wide QRS
1 and aVL look alike
no septal Q wave in V5-V6
Deep QS complex in V1 and V2

Question 10

which has a wide S wave LBBB or RBBB

Answer 10

RBBB