Abstract
The subendocardial lymphatics of the canine right ventricle were visualized, and their anatomic relation to the right ventricular conduction system was observed. The lymphatics traversed the main right bundle at many levels and intersected with longitudinal lymphatics following the course of the bundle. In addition, lymphatics crossed the various peripheral branches of the right bundle. The lymphatics anterior to the right bundle tended to be more transversely oriented, whereas those posterior to the bundle were longitudinal, extending from the inferior region to the superior portion of the septum. It is suggested that the lymphatics may play a role in pathologic lesions involving the conduction system, either by direct involvement, or indirectly, by carrying large concentration of potassium from remote damaged areas. The effect of the potassium could be manifested as a conduction defect due to decreased conduction velocity (for example, A-V conduction defects with inferior infarction or right bundle branch block with anteroseptal infarction) or the development of arrhythmias.
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