Bundle Branch Block - csnlc.nhs.uk

Bundle Branch Block

Lancashire & South Cumbria Cardiac Network

Phases of Activation

? Phase 1 - septal depolarisation occurring

from left to right, 1st and alone

? Phase 2 & 3 - depolarisation of free wall of

left & right ventricles, occurring together

1

2

3

RV

V1

RV

V2

IVS

V3

IVS

V4

LV

V5

LV

V6

Bundle Branch Block

? A delay of conduction in either of the

bundle branches.

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