ECGs: Bundle Branch Blocks

Question 1

the bundle of his splits into…

Answer 1

left anterior hemibundle

left posterior hemibundle

Question 2

3 criteria on ECG for RBBB

Answer 2

QRS >0.12
RSR complex in V1 (MarroW)
delayed S wave in 1, V5 and V6

Question 3

VT is defined as >__ beats of ventricular origin with a HR >__bpm

Answer 3

3

120

Question 4

sustained VT needs >__s of tachycardia

Answer 4

30

Question 5

VT with identical QRS complexes

Answer 5

monomorphic VT

Question 6

VT with different QRS complexes

Answer 6

polymorphic VT

Question 7

what is aberrency?

Answer 7

when someone with a BBB develops atrial tachycardia

Question 8

how do you diagnose SVT with aberrancy

Answer 8

vagal manoeuvres

adenosine

Question 9

if the patient has a PMH of BBB and shows signs of VT on ECG…

Answer 9

consider SVT with aberrancy

Question 10

causes of TdP

Answer 10

low magnesium

long QT

Question 11

what is a q wave?

Answer 11

the first negative deflection in the QRS complex

Question 12

left anterior hemiblock causes __ axis deviation

Answer 12

left

Question 13

left posterior causes __ axis deviation

Answer 13

right

Question 14

best place to look for p waves

Answer 14

V1

Question 15

name 4 ways in which T waves can present on ECG in an MI

Answer 15

tall
biphasic
inverted
flattened

Question 16

what’s the earliest ECG sign of an MI?

Answer 16

abnormal T wave

Question 17

where do pathological Q waves present?

Answer 17

V1-3

Question 18

ST depression in V1-3

Answer 18

posterior MI