[Morphologic changes in the heart atrium in frogs after extinction of current due to suction electrode induced damage].

In biological model experiments in frog heart morphological substrate was observed in current extinction due to damage under suction electrode. After short-term suction discharge monophase recording disappeared without demonstrable myocyte ultrastructure changes by means of reparation ad integrum. Monophase recording spontaneously disappeared in distinct changes of monocyte structure with enlarged spaces in between myofibrils, with breakdown of cristae in mitochondria and with dilatation of tubules and cisternae of the endoplasmic reticulum. This tissue disintegration leads to demarcation and forming of new cellular surfaces on the border with the healthy tissue so that the damaged area turns into a mere electric conductor.