Incomplete left bundle branch block

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Diagnosis

Electrocardiogram

1. QRS duration between 110 and 119 ms in adults, between 90 and 100 ms in children 8 to 16 years of age, and between 80 and 90 ms in children less than 8 years of age.
2. Presence of left ventricular hypertrophy pattern.
3. R peak time greater than 60 ms in leads V4, V5, and V6.
4. Absence of q wave in leads I, V5, and V6.

Also a narrow initial R wave in V1 has been linked with a reduced response to CRT.