Mnemonic for left vs. right bundle block


ECG Mnemonic: left vs. right bundle block

"WiLLiaM MaRRoW":

W pattern in V1-V2 and M pattern in V3-V6 is Left bundle block.
M pattern in V1-V2 and W in V3-V6 is Right bundle block.

Note: consider bundle branch blocks when QRS complex is wide.

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