22. Choice B is the correct answer. The R and R' waves seen in only V1 and normal R wave in V2 makes it an incomplete right bundle branch block. If the R and R' wave are present in leads V1 and V2 its a complete right bundle branch block. With left bundle branch blocks, the R and R' waves are seen in leads V5 and V6. It is an incomplete left bundle if it is only seen in one of the leads.
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