Atrioventricular node fetal dispersion and His bundle fragmentation of the cardiac conduction system in sudden cardiac death
M. Paz Suarez-Mier, MD, PhD* and
Carlos Gamallo, MD, PhD
* Section of Histopathology, Institute of Toxicology, Madrid, Spain
Department of Pathology, La Paz Hospital, Madrid, Spain

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Figure 1 (a) Islands and tongues of conduction tissue (arrowheads) separated from the atrioventricular node (AV node), embedded in the central fibrous body. Masson trichrome O.M. x4, reduced by 70%. (b) Fragmentation or septation of the His bundle. Masson trichrome O.M. x4, reduced by 70%.
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