Heterotopic tracheal transplantation with omentum wrapping in the abdominal position preserves functional and structural integrity of a human tracheal allograft.

OBJECTIVES: Transplantation of a human trachea has been reported only twice in the literature with limited documentation of the functional and structural properties of the allograft. PATIENTS AND METHODS: A 57-year-old patient with chronic obstructive pulmonary disease with low segment tracheal stenosis was accepted for lung transplantation and 2-stage tracheal allotransplantation. Standard bilateral sequential lung transplantation was performed with the transfer of the donor trachea into the recipient's abdomen, which was wrapped in the greater omentum and sutured into the abdominal wall, similar to a stoma. The patient received immunosuppression consisting of cyclosporine A, mycophenolate mofetil, and cortisone. Sixty days later, the tracheal allograft presented with macroscopically normal appearance with maintained elasticity and rigidity. The patient underwent a cricotracheal resection 6 months after lung transplantation. However, reconstruction with direct end-to-end anastomosis was achievable. The tracheal allograft, therefore not needed for reconstruction, was harvested and underwent complete investigations. RESULTS: Cross-section of the graft revealed a mechanically stable and macroscopically intact trachea. Hematoxylin-eosin staining demonstrated vital cartilage covered by respiratory epithelium. Angiography, followed by corrosion studies and electromicroscopy, demonstrated excellent vascularization of the tracheal wall. CONCLUSION: The patient is alive 31 months posttransplantation and remains in bronchiolitis obliterans syndrome stage 0. Human trachea wrapped in omentum maintains its functional and structural integrity and may be used for 2-stage allotransplantation.

Pleurovenous shunting in the treatment of nonmalignant pleural effusion.

BACKGROUND: The goals of treatment of chronic nonmalignant pleural effusion are relief of dyspnea and improved quality of life. Treatment options include needle thoracentesis, tube thoracostomy chemical pleurodesis, and pleurectomy. Pleurovenous shunting (PVS) represents an alternative, minimally invasive method. METHODS: Since 1999, 12 patients underwent pleurovenous shunting for right-sided pleural effusion in our center. Indications were hepatic hydrothorax (n = 6, one as bridging to liver transplantation), nephrotic syndrome (n = 4), and chylothorax (n = 2, one as bridging to lung transplantation). All patients received Denver shunt systems from the pleural cavity to either the subclavian or jugular vein. RESULTS: Shunt occlusion was observed in one case (chylothorax) 4 weeks after implantation. There was one early death, which was not related to the procedure (hepatic failure). No air embolism or infection was observed. All systems were patent throughout the observation period of 1 to 40 months (mean = 13.3 months), and none of the patients required further treatment for pleural effusion. CONCLUSION: Pleurovenous shunting offers an efficient, minimally invasive alternative to other surgical methods for treatment of recurrent nonmalignant pleural effusion.

Efficacy and safety of topical application of human fibrinogen/thrombin-coated collagen patch (TachoComb) for treatment of air leakage after standard lobectomy.

OBJECTIVES: Persisting air leakage after pulmonary resection remains a significant problem. The aim of the study was to evaluate the incidence of air leakage after standard lobectomy and test the efficacy and safety of TachoComb (TC). METHODS: A total of 189 patients undergoing lobectomy were enrolled in a multi-centre, open, randomised, and prospective study to test the efficacy and safety of TachoComb (TC) for air leakage treatment. Air leakage was assessed by water submersion test, and scored as grades 0 if no, 1 if countable, 2 if a stream of and 3 if coalescent bubbles have been observed. Any sites with grade 3 air leakage received further stapling or limited suturing until grade 0, 1 or 2 was obtained. Treatment of air leakage was done with TC or suturing according to randomisation. Air leakage was assessed by further submersion tests. Postoperative air leakage was assessed using the Pleur-Evac system. RESULTS: Overall incidence of air leakage 48+/-6 h after surgery was 34% for TC and 37% for standard treatment (P=0.76). The reduction of intra-operative air leak intensity in the subgroup with grades 1-2 was significantly higher for the TC group (P=0.015). Postoperative air leakage intensity in the subgroup with air leakage grades 1-2 was lower for TC than standard treatment (P=0.047). The mean duration of postoperative air leakage in the subgroup with grades 1-2 was shorter for the TC group than for standard treatment, i.e. 1.9+/-1.4 vs. 2.7+/-2.2 days (P=0.015). CONCLUSIONS: TC could be proven as well-tolerated and safe. In the subgroup of patients with established air leakage, TC showed superior potential in reduction of intra-operative air leakage as well as in reduction of intensity and duration of postoperative air leakage.

Efficacy and safety of TachoSil® versus standard treatment of air leakage after pulmonary lobectomy.

OBJECTIVES: Alveolar air leakage remains a serious problem in lung surgery, being associated with increased postoperative morbidity, prolonged hospital stay and greater health-care costs. The aim of this study was to evaluate the sealing efficacy and safety of the surgical patch, TachoSil®, in lung surgery. METHODS: Patients undergoing elective pulmonary lobectomy who had grade 1 or 2 air leakage (evaluated by the water submersion test) after primary stapling and limited suturing were randomised at 12 European centres to open-label treatment with TachoSil® or standard surgical treatment (resuturing, stapling or no further treatment at the surgeons' discretion). Randomisation was performed during surgery using a centralised interactive voice response system. Duration of postoperative air leakage (primary end point), reduction of intra-operative air leakage intensity (secondary end point) and adverse events (AEs), including postoperative complications, were assessed. RESULTS: A total of 486 patients were screened and 299 received trial treatment (intent-to-treat (ITT) population: TachoSil®, n=148; standard treatment, n=151). TachoSil® resulted in a reduction in the duration of postoperative air leakage (p=0.030). Patients in the TachoSil® group also experienced a greater reduction in intra-operative air leakage intensity (p=0.042). Median time until chest drain removal was 4 days with TachoSil® and 5 days in the standard group (p=0.054). There was no difference between groups in hospital length of stay. AEs were generally similar in both groups, including postoperative complications. CONCLUSIONS: TachoSil® was superior to standard surgical treatment in reducing both postoperative air leakage duration and intra-operative air leakage intensity in patients undergoing elective pulmonary lobectomy.

Split lung transplantation with intraoperative extracorporeal membrane oxygenation (ECMO) support.

Pulmonary bipartitioning or split lung transplantation, which was first described in 1997, presently represents the most efficient use of donor lungs. With this technique, a left donor lung can be separated into an upper and lower lobe and used for bilateral transplantation in a smaller recipient. The right donor lung remains for use as a single lung graft in another patient. In 2001, a similar technique for splitting a right lung was described. The technique of harvesting and procurement of the donor organ for split lung transplantation is identical to the standard lung transplantation technique. The final separation of the donor lung is performed at the level of the interlobar fissure immediately prior to implantation. The lower lobe is implanted in the left recipient hemithorax, whereas the upper lobe, after closing of the central end of the left main pulmonary artery, and a 180° rotation along the vertical axis, is grafted into the right hilus. The use of extracorporeal membrane oxygenation (ECMO) provides intraoperative hemodynamic stability and protects the first implanted lobe from overflow and resulting reperfusion injury. This report discusses the technique developed at the department of cardiothoracic surgery of the Medical University of Vienna.