Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Electrocardiographic tracing of modified V1 and V5 leads and D3, demonstrating 2:1 AV block with right bundle branch block. Thus, the anatomical site of the block is infra-His. (A higher resolution / colour version of this figure is available in the electronic copy of the article).
