Abstract
Eleven pigs (18–35 kg) were submitted to partial splenic resection with an 8° divergent Nd-YAG laser beam (80 W). The gastroepiploic artery was ligated in 10 pigs. The laser provided both rapid cutting and haemostasis, and the ischaemic layer was limited to 1 or 2 mm in thickness. This was replaced by fibrous tissue by the tenth postoperative day and delayed bleeding was not observed. Semi-thin and electron microscopic examinations of the spleen on the third postoperative day showed intensive macrophage and polynuclear infiltration into the red pulp in the vicinity of the resection. At ten days mitotic figures of lymphoid cells and a few mast cells were present in the white pulp. By day 30 a large concentration of plasmocytes and mast cells were scattered in germinal centres underlying the new fibrotic capsule. Healing, with restoration of the size of the spleen, was found at six months and at twelve months postoperatively.
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