Model of single left rat lung transplantation. Relation between surgical experience and outcomes

The model of unilateral orthotropic left rat lung transplantation is well known and established experimental procedure. The author's personal learning curve of mastery process of this microsurgical procedure is presented.

During 18 months the author has performed 197 single left lung transplantations on the Thoracic Surgery Ward in University Hospital, Berne, Switzerland. There were 147 allogeneic and 50 isogeneic transplantations done. The allogeneic transplantations were carried out from Brown-Norway to Fischer F344 rats whereas isogeneic transplantations were done among Fischer F344 rats solely. Grafted lung was obtained from the intravenously anaesthetised, oxygen-ventilated donor. The implantation was carried out through left posterolateral thoracotomy on the gas anaesthetised, respirator ventilated recipient. The anastomoses of the vessels were done using the cuff technique, bronchi were sutured using continuous running over-and-over suture. Recipients were sacrificed on day 5 post-transplant. All recipients were divided into four consecutive groups. Warm ischaemia time and presence of perioperative pure technical complications were observed.

We observed time dependent decline of complications number of consecutive recipient groups, respectively 20, 5, 4, 1. The warm ischaemia time in minutes decreased from 35.6 +/- 5.4 in group I through 26.7 +/- 4.4 in group II, 24.8 +/- 2.3 in group III to 22.0 +/- 3.1 in group IV.

Continuous training of the procedure shortens the average warm ischaemia time and reduces the number of complications. This tedious microsurgical procedure is possible to master by the surgeon.