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J Thorac Cardiovasc Surg 1999;117:1112-1117
© 1999 Mosby, Inc.
GENERAL THORACIC SURGERY |
From the Department of Thoracic Surgery, Royal Brompton Hospital, London, United Kingdom.
Received for publication Dec 7, 1998. Revisions requested Jan 8, 1999. Revisions received Feb 12, 1999. Accepted for publication Feb 19, 1999. Address for reprints: Cemal Asim Kutlu, MD, Nispetiye Cad, Saydam Sok, 20/1, Levent 80600, Istanbul, Turkey.
| Abstract |
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| Introduction |
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The major postoperative complications of sleeve resection, dehiscence and stricture, are related to anastomotic problems. These may result from disruption of the vascular supply, and care must be taken to preserve the blood supply of the bronchus at the anastomosis.
4 Other authors have emphasized the importance of other factors such as the avoidance of tension or infection, which may affect healing.
5 The anastomotic technique is clearly of importance. Although a variety of suture materials have been used, reports in the past 50 years all have favored an interrupted suture technique.
In our institution, for the last 19 years we have used a continuous suture technique with monofilament, nonabsorbable suture material for all tracheal and bronchial anastomoses with satisfactory results. We have previously described the good results with this technique for the closure of the pneumonectomy stump.
6 In this report we retrospectively reviewed our experience with sleeve resection using this technique, and we report the associated morbidity and mortality of the technique.
| Patients and method |
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In operations for lung cancer, systemic nodal dissection was undertaken routinely,
7 and nodes were identified by means of the Naruke nodal map.
8 Postoperatively, the TNM classification system, recently revised, was used for staging.
9 All complications occurring within 30 days of the operation were classified as early complications. Operative mortality was defined as death occurring within 30 days of the operation or death directly related to the procedure even if it occurred more than 30 days after the operation. Tumor growth at the anastomosis was considered to be a local recurrence regardless of the interval after operation.
Preoperative evaluation
All patients had a chest radiograph and computed tomography (CT) of the chest. In those patients with malignant disease, CT of the brain and abdomen was performed routinely and magnetic resonance imaging, positron emission tomography, and bone scintigraphy were performed selectively. Arterial blood gas assessment and spirometry were routine, and in the patients with limited lung function a ventilation/perfusion scan was performed. Examination with a fiberoptic bronchoscope was undertaken before the operation for histologic evaluation. Invasive mediastinal staging, using cervical mediastinoscopy and/or anterior mediastinotomy, was undertaken in any patient with malignant disease if the CT of the chest suggested mediastinal involvement. Surgery was not considered in those patients who were proven to have mediastinal nodal involvement. None of the patients in this series received induction therapy with chemotherapy or chemotherapy/radiation therapy.
Operative procedure
It is our routine to use a rigid bronchoscope before thoracotomy to check for intrabronchial lesions and to identify patients in whom bronchoplastic procedures may prove feasible. In operations for lesions beyond the main carina, the patients were intubated with a double-lumen endobronchial tube. In operations for lesions of the trachea or carina, an endotracheal tube was preferred. When necessary, ventilation of the opposite lung was continued with the aid of a Venturi technique or an additional endobronchial tube inserted across the operative field. A standard posterolateral thoracotomy was undertaken for lesions of one lung, the distal trachea, and/or carina. A collar incision was used for lesions of the upper trachea.
In operations for lung cancer, our technique did not differ until the bronchus was isolated. We tried not to devascularize the bronchus beyond the line of section, although our systematic nodal dissection usually led to the division of all bronchial vessels. The bronchus was divided after placement of stay sutures to orientate the proximal and distal lumina. Frozen section analysis of the proximal and distal margins was routinely performed to confirm that they were free of disease. The distal transection line was made as close as possible to the lobar origin to maximize any retrograde flow from the bronchial vessels. The anastomosis was performed with a double-ended suture of 3-0 polypropylene (Prolene, Ethicon Inc, Somerville, NJ), commencing at the far side of the membranous wall of the airway and continuing in a continuous suture around the cartilaginous wall, leaving the membranous wall until last to allow for any disparity between the cross-sectional area of the distal and proximal orifices. When the trachea was sutured, additional sutures of 2-0 polypropylene were placed through the entire thickness of the airway at each quadrant and tied at the completion of the anastomosis. Cartilage-to-cartilage apposition was achieved with an open suture technique, the ends being pulled together at the completion of the anastomosis without distortion. After completion of the anastomosis, the suture line was checked for air leaks by inflating the lung after immersing the anastomosis under fluid. The anastomosis was not covered with any soft tissue wrap. The inferior pulmonary ligament was divided in those patients undergoing lateral thoracotomy to decrease the tension at the anastomosis. Postoperative bronchoscopy was not performed routinely. Careful bronchial suctioning was performed through the endobronchial/endotracheal tube at the end of the procedure. Patients were extubated in the operating theater immediately after the procedure. Chin sutures were used to maintain flexion in patients who had tracheal or carinal resection. Steroids were not used in any of these patients.
| Results |
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Bronchial sleeve resection without removal of lung parenchyma was performed in 12 patients (carcinoid tumor in 4, benign stricture in 4, malignant tumor in 2 [squamous cell carcinoma and mucoepidermoid carcinoma], benign tumor in 1, and traumatic rupture in 1). All of these resections were performed through a lateral thoracotomy. On the left side, adequate exposure was obtained below the aortic arch by mobilization of the pulmonary artery and division of the ligamentum arteriosum.
A right sleeve pneumonectomy was undertaken in 2 patients with malignant lung tumors (adenoid cystic carcinoma and squamous cell carcinoma), which were found at operation to be involving the carina. Standard thoracotomy was used for both patients. No patient had a carinal resection with a 3-part anastomosis in this series.
Sleeve lobectomy was performed in 66 patients: for lung cancer in 41 patients, carcinoid tumor in 22 (including 18 typical and 4 atypical tumors), metastatic sarcoma in 1, post-tuberculosis stricture in 1, and fibrous histiocytoma in 1 patient. Two of these patients, who underwent a right upper lobectomy and sleeve resection for lung cancer, had concomitant chest wall resection.
Four patients had sleeve segmentectomy (lingulectomy in 2 and resection of the apical segment of the lower lobe in 2). Three of them had carcinoid tumor and the fourth had stage I squamous cell carcinoma. All these patients were considered able to tolerate major lung resection if necessary. Limited resection with curative intent was considered justified once shown at thoracotomy to be technically feasible and appropriate.
Forty-four patients underwent sleeve resection for lung cancer. The cancer stages were as follows: stage IA in 7 (T1 N0) and IB in 17 (T2 N0); stage IIB in 11 (T2 N1 in 3, T3 N0 in 8); stage IIIA in 7 (T3 N1 in 3, T1-3 N2 in 4) and stage IIIB in 2 (T4 N0). Six patients had N1 disease, with single station involvement of lymph node No. 10 in 2 patients, No. 11 in 3 patients, and No. 12 in 1 patient. In 4 patients systematic nodal dissection revealed N2 disease: station No. 5 and/or No. 6 in 2 patients and station No. 7 in the other 2 patients.
Follow-up was from 6 months to 14 years (median 4.3 years). At the time of follow-up, the clinical condition of patients who had undergone sleeve resection for benign disease improved or remained the same. Three patients died in this group because of causes unrelated to the original disease. In the group of patients undergoing sleeve resection for lung cancer, 2 had locoregional recurrence (2/44). Fourteen patients died of relapse (32%).
Inasmuch as the purpose of this paper is to present the results of the surgical technique, we did not undertake more detailed analysis of the survival data.
Postoperative complications
Postoperative complications are listed in Table II. The morbidity of sleeve resection was 12% in this study. Three patients had a postoperative pneumothorax but we did not undertake bronchoscopy; the pneumothorax resolved without treatment in 2 patients and necessitated chest tube insertion in 1. Partial anastomotic dehiscence was confirmed by bronchoscopy in 3 patients, occurring between 4 and 12 days after operation. In 1 patient completion pneumonectomy was performed on the fifteenth postoperative day to control infection and an air leak. In a second patient the anastomosis healed and the air leak spontaneously stopped without further treatment. In the third patient partial bronchial dehiscence was associated with a bronchoatrial fistula, causing death on the ninth postoperative day as a result of massive hemorrhage. The other postoperative death was caused by pneumonia and cerebral infarction after tracheal sleeve resection, for an overall operative mortality of 2% (Table II
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| Discussion |
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Van Schil and associates
14 reported that the rate of stenosis was 14.3% when a continuous anastomosis was undertaken with polypropylene or Teflon-coated polyester sutures and only 5.7% after interrupted suture with polyglactin. The rate of stenosis in our series (5%) is comparable with that of the latter group in their report. Hsieh and colleagues
15 performed bronchial anastomosis in puppies using interrupted or continuous suture techniques with absorbable (Dexon-S [Davis & Geck, Danbury, Conn], Vicryl [Ethicon]) and nonabsorbable (Prolene [Ethicon], nylon) suture material. They observed excellent results in the absorbable group regardless of the suture technique used. Relative bronchial stenosis occurred in the growing puppies in which a continuous anastomosis was constructed with nonabsorbable suture material. This study showed that the suture technique, either continuous or interrupted, is feasible for the bronchial anastomosis and that absorbable material is preferable in the pediatric cases.
Healing at the site of tracheal and bronchial anastomoses depends on an adequate blood supply. Even if the bronchial arteries are preserved, cutting and suturing of the bronchus disturbs the bronchial circulation. The anastomosis remains ischemic until the systemic arterial circulation is reestablished in 2 to 4 weeks.
16 Poor healing results in anastomotic dehiscence and stenosis after the operation.
5 Retrograde flow has been detected from the pulmonary artery into the bronchial arteries distal to the anastomosis immediately after resection.
4 However, healing will be impaired if this is the only arterial supply to the anastomosis. Surrounding tissues provide some systemic supply to the distal part of the anastomosis. In an experimental study, Inui and coworkers
5 measured the mucosal blood flow after sleeve resection with limited or extensive mobilization of the airways. The decrease in the blood flow was significantly greater on the first postoperative day after extensive mobilization (81% ± 6% vs 57% ± 23%), suggesting that retrograde flow from the pulmonary circulation requires additional systemic supplies from adjacent tissues if healing is to occur.
Systematic nodal dissection is an important part of the intrathoracic reevaluation of the patients with lung cancer but inevitably leads to division of the bronchial arterial supply. We believe, however, that this additional risk is offset by the valuable contribution that systematic nodal dissection makes to the assessment of operability and the extent of resection required for complete resection, and this should therefore be accepted. Debate continues as to whether sleeve resection should be performed in the presence of N1 disease. Undoubtedly much of the earlier confusion was caused by inaccurate nodal dissection, such that many patients with N1 disease had unrecognized N2 disease. One report has found that regional lymph node involvement (N1 disease) did not have an adverse effect on survival after sleeve resection,
12 with a 5-year survival of 46%.
2,12
We believe that sleeve resection is a valid option for selected patients with N1 disease, irrespective of respiratory reserve. In our series, sleeve resection was undertaken with curative intent in 6 patients with N1 disease. Surgery can be curative for limited N2 disease, and sleeve resection should be considered for such patients, especially those with "skip" metastases to N2 nodes.
17 Many authors have attempted to reduce the problems of bronchial healing after sleeve resection by using a variety of techniques. Lima and colleagues
18 wrapped the bronchial anastomosis with greater omentum after autotransplantation in the dog and demonstrated systemic blood flow by postoperative day 4. Such a wrap may be beneficial but certainly extends the operation time. We believe that careful handling of the airways avoids the need for any soft tissue wrap after sleeve resection. Furthermore, the wrap may have an adverse effect on healing if it prevents systemic blood flow from surrounding tissue. This may explain the higher 30-day mortality (11.1%) in one study for the group of patients with a pedicled flap when compared with those without any flap (4.5%).
19 One may consider such a wrap desirable if undertaking resection after induction radiotherapy or in high-risk operations for multidrug-resistant tuberculosis.
Granulation formation at the suture line was the commonest complication in early series reporting the results of sleeve resection.
10 Modern, synthetic suture materials may have led to a reduced complication rate. Absorbable suture materials (polyglactin 910 [Vicryl], polyglyconate [Maxon, Davis & Geck]) and nonabsorbable sutures such as polypropylene (Prolene) have been those most commonly used in recent series reporting the results of tracheal and bronchial anastomosis.
19-21 However, the incidence of stricture formation after sleeve resection in one of our earlier series was 13%,
22 and this has fallen despite our use of the same suture material, suggesting that other factors, such as more careful handling of the bronchus, may be important.
The majority of deaths after resection for lung cancer are due to relapse, mainly at distant sites.
10 The recurrence rate after sleeve resection (10.3%) is higher than that after standard resections,
23 and yet survivals are comparable with those after pneumonectomy, possibly since patients surviving sleeve resection have the chance for surgical treatment of their recurrent disease, or for the subsequent development of a second primary tumor. Preservation of functional lung tissue by sleeve resection provides a greater exercise capacity and improved quality of life.
21,24 We believe that sleeve resection should be the resection of choice in any patient in whom the anatomy is suitable, irrespective of their physiologic reserve.
Our experience suggests that the results of sleeve resection using a continuous anastomosis are comparable with those reported with an interrupted technique. Bronchial blood supply is adequate for healing unless the bronchus is excessively mobilized. The continuous suture is quick and technically easier to perform and has been safe in the hands of a large number of trainees in our institution. Postoperative outcomes suggest that it is also safe in the long term.
| References |
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