Bundle branch blocks Flashcards
1
Q
Which type of BBB - left BBB or right BBB is always pathological?
A
Left BBB
2
Q
What is the main ECG feature of a BBB?
A
Broadening of the QRS compelx
3
Q
Name a cause of RBBB
A
IHD, congenital heart disease, underlying lung pathology i.e. PE
4
Q
Name a cause of LBBB
A
Aortic stenosis, IHD, MI, digoxin toxicity, hyperkalaemia
5
Q
How does RBBB appear on an ECG?
A
M pattern in V1, and W in V6 (MaRRoW)
6
Q
How does a LBBB appear on an ECG?
A
W pattern in V1, and M pattern in V6 (WiLLiaM). T wave inversion in the anterolateral leads
7
Q
What 2 features on an ECG indicates a bifascicular block?
A
RBBB + left axis deviation
8
Q
What is the difference between a bifascicular block and a trifascicular block?
A
Trifascicular block = bifascicular block + 1st degree heart block
