[Enzyme activity in the normal atrioventricular node and in the bundle of His in young children].

The authors examined by histochemical methods the atrioventricular node and the bundle of His in five infants who died from unnatural deaths and in a four-and-half-year-old child who died immediately following haemorrhagic infarction of the gut. Both structures differed, similarly as in adult age, from working muscle by a lower oxidation capacity, higher activity of the pentose-phosphate shunt and a high acetylcholine esterase activity.