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The hearts in 7 cases of congenital atrioventricular (A-V) block due to absence of or diminution in the connection between the atria and the A-V node or bundle (in the absence of the A-V node) were studied by serial section. In 3 cases the A-V node was present; it was buried in the central fibrous body and the atrioventricular portion of the pars membranacea. In 3 cases the A-V node was absent, but...