Cardiovascular · UKMLA & AKT
Bundle branch blocks and bifascicular block
A free high-yield preview for the UKMLA Applied Knowledge Test. Below are the key points to recognise bundle branch blocks and bifascicular block — the full SA Note notes add investigations, management, complications and 10 practice questions.
Key high-yield points
WiLLiaM MaRRoW - in LBBB: V1 = W-shape, V6 = M-shape. In RBBB: V1 = M-shape (RSR'), V6 = W-shape (deep S wave).
Discordant ST-T changes in BBB are secondary and expected - they do NOT indicate ischaemia in isolation. LBBB makes identifying ischaemia on ECG very difficult.
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