ECG Findings in Left Bundle Branch Block

Left bundle branch blocks (LBBB) are a common finding on ECG’s particularly in the ER and ICU. New onset of a LBBB can herald underlying ischemia or infarct. Some ECG findings indicative of LBBB are:

1. QRS wave greater than 0.12 sec
2. Broad R wave in leads I, V5, and/or V6
3. Absence of Q wave in leads I, V5, and/or V6
4. ST segment depressions in leads V4, V5, and/or V6
5. Delayed onset of R wave peak time in leads V5 and V6

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