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Ann Thorac Surg 2005;79:968-973
© 2005 The Society of Thoracic Surgeons
a Department of Thoracic Surgery, University of Freiburg, Freiburg, Germany
b Department of Medical Biometrics and Statistics, University of Freiburg, Freiburg, Germany
Accepted for publication August 10, 2004.
* Address reprint requests to Dr Ludwig, Department of Thoracic Surgery, University Hospital Freiburg, Hugstetterstr 55, 79106 Freiburg, Germany (E-mail: ludwig{at}ch11.ukl.uni-freiburg.de).
| Abstract |
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METHODS: The charts of 310 patients who underwent either pneumonectomy or sleeve lobectomy for lung cancer stages I to IIIA from 1987 to 1997 were reviewed. One hundred ninety-four patients underwent pneumonectomy, and 116 patients underwent sleeve lobectomy. Specific operative complications, i.e., anastomotic leakage versus stump dehiscence, perioperative complications, 30-day or in-hospital mortality, and 5-year survival were registered for comparison of the immediate risk of the respective procedures.
RESULTS: In the bronchial sleeve lobectomy group, the incidence of anastomotic leakage was 6.9% (8 of 116 patients) and the operative mortality was 4.3%. The incidence of bronchial stump fistulas after pneumonectomy was 3.6% (7 of 194 patients), and early mortality was 4.6%. All but 6 patients (98%) had a complete resection. Overall 5-year survival after sleeve lobectomy was 39% and after pneumonectomy, 27%. The distribution of 5-year survival stage by stage in either group is presented. Sleeve lobectomy, age younger than 65 years, pN0, and stage I are positive prognostic factors for long-term survival. In the multivariate analysis, pneumonectomy is a negative prognostic factor.
CONCLUSIONS: The indication for pneumonectomy versus sleeve lobectomy depends on the localization of the primary tumor on the one hand, and on cardiorespiratory function, which might be more often distinctly impaired in the sleeve group, on the other hand. This could explain why the mortality in the sleeve lobectomy group was identical with that in the pneumonectomy group. However, both techniques are appropriate treatment modalities of advanced lung cancer or patients with critical functional reserve. Therefore, whenever possible, sleeve lobectomy should be performed.
| Introduction |
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| Patients and Methods |
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Preoperative staging included a chest roentgenogram, computed tomography of the chest and upper abdomen, lung function test, arterial blood gases, and perfusion scintigraphy of the lung when forced expiratory volume in 1 second was less than 2.0 L. Patients at high risk for coronary heart disease were screened by echocardiography, stress testing, or coronary arteriography if appropriate. Bronchoscopy was performed for endobronchial staging and selection of the potential candidates for sleeve lobectomy. Mediastinoscopy was performed to exclude pN3 nodal status.
All patients underwent double-lumen endotracheal intubation. The routine approach was a posterolateral thoracotomy in the bed of the fifth or sixth rib. After complete exposure of the pulmonary artery, bronchus, and vein, the final decision was taken as to whether sleeve lobectomy was feasible oncologically and technically. Care was taken to manipulate the tumor as little as possible and to preserve the bronchial blood supply. Resection of the main bronchus was performed proximal and distal to the lobar orifice for sleeve resection. Intraoperative frozen section of the resection margins was performed to confirm oncologic completeness. Angioplastic procedures were performed when necessary either by oblique resection or concomitant vascular sleeve resection. A tension-free bronchial anastomosis was performed with a continuous suture using absorbable 4-0 material (Maxon, B. Braun-Dexon, GmbH, Spangenberg, Germany) over two thirds of the circumference, completed by single stitches. At the end of the procedure, the anastomosis was routinely inspected bronchoscopically. A pericardial flap, pleural flap, or mediastinal fat was usually placed between the anastomosis and the pulmonary artery. In the case of a pneumonectomy, the main bronchus was closed with absorbable 3-0 material (Maxon, B. Braun-Dexon, GmbH) until 1995, thereafter with double-row polypropylene 2-0 (Prolene, Ethicon, Johnson & Johnson Intl, Norderstedt, Germany). The first row was a to-and-fro continuous suture, the second an over-and-over running suture. The stump was routinely covered for protection on the right side as described above. In either case, suture lines were checked for air leaks with an airway pressure of 30 mm Hg or higher. Systematic lymphadenectomy was performed for lymph node staging. Two chest tubes were placed, one anterolateral and the second posterobasal, in the case of sleeve resection and a single chest tube for 12 to 24 hours after pneumonectomy. Routine postoperative bronchoscopy was performed in all patients before discharge between day 10 and 12 as a quality control and to achieve early recognition of stump insufficiency or anastomotic leakage. Adjuvant radiotherapy was indicated in all patients with pN2 nodal status, whereas induction therapy was only given in selected patients with bulky cN2 nodal status by computed tomography.
Histologic classification according to the TNM classification (1997) [6] was used to determine the stage of the disease. Follow-up was complete for all patients except 7 up to April 2002 (94%). Determination of the exact location of recurrence (local versus regional versus distant) was not complete as diagnosis was often made outside of our institution without systematic bronchoscopy or computed tomography.
Statistical analysis was obtained by introducing the data into SPSS (SPSS for Windows, release 10.0; SPSS Inc, Chicago, IL). Survival probabilities were estimated by the method of Kaplan-Meier. We performed univariate and multivariate analysis of survival times using the log rank test and the Cox model. Statistical significance was found for any value of p less than 0.05. Results are presented as estimated relative risk with corresponding 95% confidence intervals.
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| Comment |
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Interestingly, in these 310 patients the predominant histologic type was squamous cell carcinoma (62%); adenocarcinoma represented 15%. Comparing histologic distribution of the 1,293 patients operated on during the same period, squamous cell carcinoma represented 41% and adenocarcinoma 27%. The high proportion of squamous cell carcinoma may be related to the central position of the tumor, which seems to be more frequent in this histologic subtype.
Overall mortality after pneumonectomy ranges from 6% to 10% [15]. After sleeve lobectomy, depending on the study, mortality is considerably lower today as it lies between 2% [16] and 5% [4]. In our series, 30-day mortality was 4.9%, corresponding to 14 patients of whom 5 (4.3%) had a lung tissuesparing resection and 9 (4.6%) a pneumonectomy. In this group of patients, the average age was higher (63 years); there were 13 men and 1 woman. Retrospective analysis of the patient records showed that only in 4 patients (3 after sleeve lobectomy and 1 after pneumonectomy) could death be related directly to technical problems. For example, in 1 patient after pneumonectomy in whom the bronchial stump was closed with single stitches, bronchial stump leakage occurred at 7 days. This being contrary to our approach, we conclude that this method of closure was insufficient. The remaining 10 patients had an increased preoperative risk owing to decreased respiratory or cardiac function. The most important risk factors influencing perioperative morbidity and mortality are age, restrictive pulmonary reserve, cardiovascular disease, perioperative myocardial infarction, respiratory infection, arrhythmia, renal failure, and diabetes [1720].
The 1-year survival argues in favor of a lung tissuepreserving resection as it is 73% after sleeve lobectomy and 64% after pneumonectomy [21]. In our series, the overall 5-year survival after sleeve resection was 39% and after pneumonectomy, 27%, which is similar to that given in the literature [22]. There are definitely more patients with a T3 tumor stage who received pneumonectomy, probably as a result of the position and size of the tumor, which may also explain these results.
Multivariate analysis of the data demonstrated that survival was influenced by lymph node involvement, the procedure, age younger than 65 years, and stage of the disease (Table 8). Patients with pN2 disease (Table 4) had a statistically significantly lower survival than those with pN0 and pN1 disease (Figs 14). This corresponds to the existing literature, in which nodal involvement is a negative prognostic factor for long-term survival [3, 16, 2326].
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In conclusion, sleeve lobectomy should be the method of choice when possible. Overall 5-year survival after sleeve lobectomy is superior to 5-year survival after pneumonectomy, indicating that lung-preserving surgery is not radicality-sparing surgery.
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