[Methods of investigating the heart conduction system]

A description is presented of improved methods of examining the conductive system of the heart designed for special routine investigations. The methodology comprises: a) injection of coronary arteries with contrast medium and their X-ray visualization, b) special technique of heart postmortem, c) histological investigation with a view to the precise topography of the particular parts of the conductive system including detailed histological processing in series cestions by means of staining methods: haematoxylin-eosin, elastica-van Gieson, P. A. S., and Heidenhain.