PubMed · 1191446
Atrio-His bundle tracts.
Abstract
The atrio-His bundle tracts are very rare; only two have been found in 687 hearts studied histologically. These tracts have a similar appearance to those of the atrioventricular bundle and form a complete bypass of the atrioventricular node. In their presence the electrocardiogram may show a short or normal PR interval. They may be responsible for some cases of very rapid ventricular response to supraventricular arrhythmias.
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C Brechenmacher. 1975. Atrio-His bundle tracts.. https://doi.org/10.1136/hrt.37.8.853
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