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A total of 24 patients with heart block revealed by scalar electrocardiography was studied using the His bundle electrogram. Four groups of disturbed conduction are described which include various types of heart block, partial and complete, at different sites, single and multiple, in the specialized conducting system. These are (i) intra-atrial block with delayed or blocked internodal conduction, (2) atrioventricular nodal block due to delayed or blocked conduction in the A V node, Received 2 December 197r.
Bekheit et al. (Sat,) studied this question.