The histopathology of the sinus node, the atrioventricular node, and the atrioventricular bundle of the heart from a child dying of diphtheria is presented. The terminal illness included atrial arrhythmias and heart block. [see figure in the PDF file] [see figure in the PDF file] The possible importance of the neuropathology of the diphtheritic heart is indicated.
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James et al. (1963) studied this question.