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J Thorac Cardiovasc Surg 1996;112:314-318
© 1996 Mosby, Inc.

CARDIAC AND PULMONARY REPLACEMENT

SPLIT TRANSPLANTATION OF THE TRACHEA: A NEW OPERATIVE PROCEDURE FOR EXTENDED TRACHEAL RESECTION

Received for publication Nov. 10, 1995 Accepted for publication Dec. 13, 1995. Address for reprints: H. Yokomise, MD, Department of Thoracic Surgery, Chest Disease Research Institute, Kyoto University, 53 Shogoin-Kawaharacho, Sakyo-ku, Kyoto 606, Japan.

Abstract

Before tracheal transplantation can be applied clinically, several problems must be solved: immunosuppression, blood supply to grafts, and reliable long-term preservation of grafts. We have conducted experiments on tracheal transplantation to solve these problems. In the present study, we tried a new operative procedure to accomplish reliable revascularization of transplanted tracheal grafts. It has been reported that transplantation of a 10-ring length of trachea is difficult even with omentopexy. Long tracheal allografts can be transplanted with use of direct revascularization, but this technique is extremely troublesome. Thus we developed a new operative procedure, "split tracheal transplantation," in which grafts are divided at the midportion and covered with omentum, after demonstrating that the blood supply to tracheal grafts can be reestablished around the suture lines. Two groups of dogs were used. In group A (control, n = 4), a 10-ring length of trachea was autotransplanted. The anastomotic sites and grafts were covered with omental pedicles. In group B (split tracheal transplantation, n = 10), tracheal grafts 10 rings long were autotransplanted. These grafts were divided at the midportion, a piece of omentum was inserted between the two halves, and the midportion was sutured. Grafts were observed regularly by bronchoscopy and examined histopathologically after the animals died or were killed. In some animals, microangiography of the bronchial circulation was done. In the control group, necrosis, stenosis, or malacia of the grafts was observed in three of the four animals. In the split transplantation group, all animals survived for at least 2 months, all grafts were incorporated, and none showed ischemia, stenosis, or malacia. Microscopic examination and microangiography revealed that neovascularization of the graft was promoted by omentum inserted at the midportion of the graft. Split transplantation of the trachea is an easy and reliable way to extend tracheal resection. (J THORACCARDIOVASCSURG1996;112:-8)

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