Lambert, Peter B.; Frank, Howard A.; Bellman, Sven; Friedman, Edward
March 1963
Angiology;Mar1963, Vol. 14 Issue 3, p121
Academic Journal
Rabbit ears were almost completely transected, and the rejoining of divided arteries and veins was studied serially by microangiography in vivo, and then by histologic examination. At 4 days, new, fine vascular communications were sufficient to maintain the viability of the distal ear. Reconnections of main arteries and veins by fine vessels were evident as early as the end of the first week. The further evolution at these channels in subsequent weeks restored direct continuity of artery and vein to vein. The steps in the reuniting of the vessels included: (1) connections formed by side branches on either side of the incision; (2) invasion of the divided vessel ends by the highly vascular granulation tissue filling the wound; (3) progressive restoration of the lumen of the terminal segments of the divided vessels; and (4) enlargement of direct and regression of circuitous pathways. The final connections were single or multiple, curved in more than one plane, uniform in diameter but always smaller than the vessel they reconnected. Elastic tissue and smooth muscle were found in the walls of the new arterial connections. The pressure gradient across the line of division seemed to be a factor determining the speed at which reconnections developed. Au artery and its accompanying vein established initial indirect roconnections at about the same time, but the vein usually preceded the artery in the development of direct end-to-end connections. This in all probability reflected earlier clot lysis in the terminal venous segment.


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