Abstract
Changes within the Coronary veins secondary to pacing leads have not been described, this study assessed these changes in explanted hearts. Macroscopically fibrous sheaths formed around longstanding leads, leading to slit like channels for venous return in smaller veins. Histologically changes included bland fibrosis, a foreign body response to the lead, a chronic inflammatory response and inflammatory destruction of the media. Individuals responded in different ways with no clear relationship of changes to duration of the lead.
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