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Circulation, Vol 61, 1048-1052, Copyright © 1980 by American Heart Association

ARTICLES

Hypoplastic and fibrotic sinus node associated with intractable tachycardia in a neonate

KM Fox, RH Anderson and KA Hallidie-Smith

A case of fetal and neonatal persistent atrial tachycardia is described in a child with complete transposition of the great arteries. At autopsy, serial sections of the conducting tissue showed that the sinus node was hypoplastic and markedly fibrotic. The sinus node consisted of a small area of cells clustered around the nodal artery. Although the underlying mechanism of neonatal persistent tachycardia is unclear, it is possible that the hypoplasia and fibrosis of the sinus node was the substrate in the present case. This mechanism should be considered in any newborn infant in whom sinus rhythm cannot be established.

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