ECG branch block

 

1- complete left bundle branch block:

– The electrical impulses will go from right to left

– QRS> 0.12 s (incomplete block -> 0.10 to 0.12)

– Deflection intrinsécoïde Delay (DIS) V6> 0,08s

– In V6 characteristic morphology: no wave q; Wide QRS with top tray or crocheted (RR ‘)

– In V1-V3: negativity wide QRS (rS, QS)

– The QRS axis is usually normal

Complete left bundle branch block

Complete left bundle branch block

2- complete right bundle branch block:

– QS time> 0.12 s (incomplete block -> 0.10 to 0.12)

– DIS delay> 0.08 s (0.04 to 0.07 s in case of in-full block) in V1-V2

– Morphology QRS in V1-V2 appearance RSR ‘ISR’ and rR ‘(R wave broad and late in cases of full block).

– In V5-V6 S wave (large in cases of full block)

– QRS axis is usually normal (sometimes deviated to the right)

Right bundle branch block

Right bundle branch block

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