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Ann Thorac Surg 2001;71:1618-1622
© 2001 The Society of Thoracic Surgeons
a Clinique Chirurgicale, Hôpital Calmette, Lille, France
Accepted for publication January 20, 2001.
Address reprint requests to Dr Porte, Clinique Chirurgicale, Hôpital Calmette, Bd du Professeur Leclercq, 59037 Lille Cedex, France
e-mail: awurtz{at}chru-lille.fr
| Abstract |
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Methods. This study was designed to investigate the effectiveness of SLS in reducing AAL in patients considered intraoperatively to have moderate to severe AAL, after all conventional measures to reduce such leaks had been used. Over 17 months, 124 patients undergoing standard lobectomy were randomized to standard closure of parenchymal surgical sites, with or without SLS.
Results. In treated patients, the mean numbers of intraoperative AAL after application of SLS were significantly smaller than in untreated patients (38.5 mL versus 59.9 mL, p = 0.0401). Postoperatively, the mean time to last observable AAL was shorter in the treated group (33.7 hours versus 63.2 hours, p = 0.0134) and the mean percentage of patients free of AAL at days 3 and 4 was smaller (87% versus 58.5%, p = 0.002). However, the occurrence of incomplete lung expansion after drain removal, and the length of the postoperative hospital stay due to prolonged AAL, were not different. In the treatment group, 4 patients developed localized empyema and incomplete lung expansion without bronchopleural fistula 7, 12, 15, and 20 days, respectively, after operation. In these 4 patients, inserted chest tubes drained infected sealant.
Conclusions. Surgical lung sealant may be a useful adjunct to conventional techniques for reducing moderate and severe AAL after lobectomy, but its use seems to increase the risk of postoperative empyema.
| Introduction |
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| Material and methods |
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Synthetic absorbable surgical sealant
The SLS used in this study consists of two components, a primer and the sealant, sold with an application system of two syringe-type applicators (one loaded with the primer solution and the other with the sealant solution) and a fiberoptic light wand. The two solutions are made up by reconstituting two vials of dry powder with the corresponding aqueous solutions. The reconstituted solutions are then loaded into corresponding syringe-type applicators equipped with nylon brush tips through which the sealant can be applied. The primer is an aqueous solution of a copolymer of polyethylene glycol with end caps of acrylate, which is brushed onto the lung target tissue to act as a wetting solution before the sealant is applied, and helps the sealant to achieve good adherence. Next, a bed of the polymer sealant is applied and photopolymerized by visible xenon light, which transforms the sealant solution into a cross-linked hydrogel. Visible light illumination from the xenon arc lamp (470 to 520 nm) at intensity of 100 mw/cM is used for 40 seconds to initiate polymerization. Theoretically the sealant acts as a barrier to AAL for 14 days and should be absorbed and eliminated from the body over a period of 10 to 16 months. The process of sealant absorption occurs by slow hydrolysis, thus releasing biocompatible components that are metabolized or cleared by the kidneys.
A fixed quantity of SLS, sold in France for US$300 in a kit with 20 mL of primer solution and 20 mL of sealant solution, was applied to the lung surfaces leaking air or at risk of leaking air in patients randomized for its use, regardless of the surface and the quantity of AAL measured before treatment.
Patient selection and alveolar air leak management
This study was performed in a single institution over a period of 17 months (October 1998 through March 2000). Patient consent was obtained before the operations, all of which were performed by the 2 senior authors (A.W. and H.P.) with the same surgical techniques, including use of staplers to create uncompleted fissure plans. Only patients undergoing standard lobectomy or bilobectomy were eligible for inclusion in the study. Patients undergoing sleeve lobectomy associated with any segmental resection or redo-thoracotomy were excluded. The sample size was calculated for the main study end point of preventing postoperative AAL. The sample size was based on published data for the persistence of AAL after lobectomy, and on the hypothesis that by postoperative day 4, the proportion of patients with AAL would have decreased from 30% in the control group to 10% in the SLS-treated group. Using the
2 test and one-sided test of significance, a sample size of 58 patients in each group was calculated to be adequate for an overall power of 80% in this study (type I error:
= 0.05; type II error: ß = 0.2). After the respective procedures, areas of AAL were closed by conventional techniques, including electrocautery and monofilament material or staplers where possible. The operated lung was then ventilated to an airway pressure of 20 mm Hg to assess the degree of AAL. Randomized patients only included those judged intraoperatively to have moderate to severe AAL according to the ventilator volumes after all conventional techniques to bring them under control had failed (minimum leaks of 40 mL and maximum leaks of 120 mL).
After AAL evaluation, patients were entered into either the treatment or control group. In the control group, patients underwent no further procedures. For patients assigned to the treatment group, SLS was applied to all identified surgical sites leaking air or at risk of leaking air while ventilation was suspended for 3 to 8 minutes (mean 5 minutes). After photopolymerization, the lung was insufflated and ventilated again to an airway pressure of 20 mm Hg.
Management of intercostal drains and assessment of the postoperative hospital stay
Before chest closure, all patients had two intercostal drains placed apically (anterior and posterior) with basal holes. Drains were placed postoperatively under negative pressure suction of 20 mm Hg and always removed on the sixth postoperative day without a clamping test, even in cases of persistent AAL. The drains were never removed before day 6 even in cases of AAL cessation. Lung expansion was evaluated after removal of the drains. A small Monaldi drain was inserted into the chest cavity in case of persistent large pneumothorax after drain removal. Only hospital stays prolonged because of AAL or adverse effects of SLS (ie, empyema) were taken into account in the total in-hospital stay calculation, excluding hospital stays prolonged because of social or cultural reasons, which we frequently encounter in France. Postoperatively, patients who developed bronchopleural fistula or required assisted ventilation for more than 24 hours before drain removal on postoperative day 6 were excluded from the final statistical analysis.
Assessment of alveolar air leak modalities
Perioperative AAL were measured with the CATO M33285 ventilator (Drager Inc, Lubeck, Germany) before and after SLS application on double-lung ventilation with a pressure of 20 mm Hg and an insufflated volume of 10 mL/kg at a frequency of 12 cycles/min. The calculated AAL was the difference between the insufflated and exufflated volumes, excluding the leaks into the circuit that were previously calculated on double-lung calculation while the surgeon was opening the chest. Postoperative AAL were graded from the bubble count in the Pleur-Evac Sahara S-1100 (Genzyme Cergy, Pontoise, France) scale ranging from 0 (absence of AAL) to 7 (major AAL) during expiration every morning for more than three different respiratory cycles. The time to last observable AAL was recorded for all patients.
Follow-up
Treated patients underwent a clinical examination and chest computed tomography (CT) scan 3 months after operation and then every 6 months in case of any abnormality found on the first CT scan.
Statistical studies
The two groups were compared using either the
2 test or Fisher exact test for categoric variables, and the Students t test for numeric variables (including perioperative AAL after SLS application, the daily quantity of AAL on the Pleur-Evac scale from postoperative days 1 to 6, the time to the last observable AAL, the percentage of patients free of AAL on postoperative days 3, 4, and 6, and the postoperative in-hospital stay due to persistent AAL or to empyema after SLS application).
| Results |
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30-day postoperative morbidity and mortality
In the control group, 1 patient developed a bilateral lung infection requiring high-pressure ventilation on day 4; this patient died on day 20. In the treatment group, 3 patients also required assisted ventilation for nonfatal lung infections of the nonoperated lung between days 2 and 5. In these 4 patients, who were on assisted ventilation for more than 24 hours before the sixth postoperative day, AAL could not be evaluated according to the study protocol. These patients were not included in the analysis, as their complications were unrelated to AAL or lung sealant application. In the treatment group, 4 patients developed systemic sepsis, associated with major sputum of infected SLS in 2 of them, without bronchopleural fistula. Loculated collection and incomplete lung expansion were ascertained by CT scan (Fig 1) on postoperative days 7, 12, 15, and 20. All 4 patients required chest tube thoracostomy for 6, 25, 11, and 20 days, respectively, to drain infected sealant according to bacteriologic studies in all cases. The prolonged hospital stay of these 4 patients was considered to be a consequence of SLS application. Overall, 59 patients in the treatment group and 61 in the control group were included in the final statistical analysis. The clinical features of both groups of patients (Table 1) were matched for age, emphysema (definition based on CT and macroscopical and microscopical aspect of the lung), professional exposure to silicosis for more than 5 years, type of operation performed, incidence of malignancy, duration of operation excluding lung surgical sealant application, and number of perioperative AAL before SLS treatment.
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| Comment |
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The SLS used in the present study was shown to adhere four times more strongly and withstand pressures 12 times greater than fibrin glue, and was capable of expanding to more than 70% of its original size. Histologic evaluation of the antigenicity of the sealant material has been shown to be similar to that of suture materials [16, 17]. Macchiarini and colleagues [18] performed a randomized trial with SLS on 30 patients. They found that the substance was easy to use and apply in all anatomic areas and did not elicit any clinically demonstrable host response. Intraoperatively, the material was able to eliminate all AAL on normal and diseased lung tissue. After the operation, the proportion of AAL-free patients was significantly higher in the treatment group. In addition, there was a tendency toward shorter times to chest tube removal and shorter hospitalization times in treated patients. In the present study, we confirmed the efficacy of SLS in reducing perioperative and postoperative AAL after lobectomy, in patients who had moderate or severe AAL before SLS application and after all the conventional measures to reduce AAL had been used. We showed that the mean time to the last observable AAL was shorter in the treated group (33.70 hours versus 63.22 hours). Nevertheless, the mean in-hospital stay was not different in the control and treated groups, mainly because of the higher percentage of empyema cases in the treated group. Accordingly, it seems that SLS does not maintain its adhesive properties over time, as suggested by the similar percentages of AAL found on the sixth postoperative day in both groups. Consequently, we suggest that in some circumstances, SLS does not adhere sufficiently to the lung, and acts as a foreign body in the chest cavity, creating impermeable pleural space liable to be infected. We base this hypothesis on two facts: first, in the 4 patients with empyemas, infected SLS was evacuated through the chest tubes inserted postoperatively (Fig 1); second, postoperative CT scan displayed a similar image in 20 other patients of the treated group, who experienced a normal recovery without any signs of infection.
The efficacy of SLS in reducing perioperative and postoperative AAL should in theory help to reduce the average duration of postoperative drainage after lobectomy. Nevertheless, the advantage of this product has to be counterbalanced by the potential risk of localized empyema, which normally is exceptional after standard lobectomies without bronchopleural fistula. Consequently, since the completion of the present study, we use SLS only in patients with major perioperative AAL, that is, more than 120 mL according to ventilator measurement.
| Acknowledgments |
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| References |
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