BBB

Question 1

right bundle branch block

Answer 1

QRS duration: Prolonged, greater than 120 ms (3 small squares).
Lead V1 and V2: Show a characteristic “RSR’” pattern or “rabbit ears” appearance.
Lead V6: Displays a wide S wave.
Secondary R wave in V1 is often taller.

Question 2

MaRRoW

Answer 2

In V1: The QRS complex has an M-shaped appearance, resembling the letter “M”.
In V6: The QRS complex looks like a W, with a wide S wave.

Question 3

William

Answer 3

In V1: The QRS complex looks like a W shape.
In V6: The QRS complex has an M-shaped appearance.

Question 4

LBBB

Answer 4

QRS duration: Prolonged, greater than 120 ms.
Lead I, V5, and V6: Show a broad or notched R wave.
Lead V1: Typically shows a deep and broad S wave.
ST and T-wave changes: Discordant to the QRS complex (T waves go in the opposite direction to the QRS).

Question 5

Causes of RBBB

Answer 5

• PE
• COPD
• RVH
• ASD
• ageing

Question 6

causes of LBBB

Answer 6

• LVH
• AV disease
• CAD