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Ann Thorac Surg 2003;75:1587-1592
© 2003 The Society of Thoracic Surgeons
a Department of Surgery, The Hospital of St. Raphael, New Haven, Connecticut, USA
Accepted for publication December 4, 2002.
* Address reprint requests to Dr Ponn, General Thoracic Surgeons of CT, 330 Orchard St, New Haven, CT 06511, USA.
e-mail: rbponn{at}aol.com
| Abstract |
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METHODS: Of 113 patients enrolled, 13 became ineligible because of intraoperative findings. The remaining 100 patients were randomly assigned to one of two groups at the conclusion of lung resection, regardless of the presence or absence of identifiable air leak. The control group received no additional intervention. The experimental group underwent application of 5 mL of fibrin glue delivered by a pressurized, aerosolized spraying mechanism. Postoperatively a blinded clinical observer recorded outcomes including the incidence and duration of AAL, prolonged AAL (PAAL), the volume of pleural drainage, the time to tube removal, and the postoperative length of stay (LOS), as well as any complications related to treatment.
RESULTS: Both groups were comparable with regard to demographics, diagnoses, and procedures. Statistically significant reductions were found in the experimental group in the overall incidence of AAL (34% versus 68%, p = 0.001), mean duration of AAL (1.1 versus 3.1 days, p = 0.005), mean time to chest tube removal (3.5 versus 5.0 days, p = 0.02), and the incidence of PAAL (2% versus 16%, p = 0.015). There was no significant difference in the volume of chest tube drainage or LOS (4.6 days glue and 4.9 days control, p = 0.318). There were no complications related to the use of fibrin glue.
CONCLUSIONS: Aerosolized fibrin glue appears to be safe and effective in reducing AAL. The overall incidence of AAL was reduced by 50% and PAAL occurred in only 1 treated patient (2% versus the usually reported 15%). Further studies with this and other methods are required to delineate routine versus selective use, to compare methods, and clarify cost benefit.
| Introduction |
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The primary approach to AAL is based on careful surgical technique and the liberal use of stapling devices when dealing with fissures. With the goal of further reducing this problem, newer approaches have been described. The use of waterseal rather than suction may reduce the duration of AAL [2, 3]. Buttressing of staple lines with bovine pericardial strips or polytetrafluoroethylene sleeves achieved popularity in dealing with the rarified parenchymal tissue of patients undergoing lung volume reduction surgery and has also been applied to routine lobectomy [46]. Direct sealants in the form of fibrin glue [7, 8], synthetic gels and polymers [911], and adherent patches [12] have also been tested.
Fibrin glue simulates the final step in the clotting cascade. This sealant consists of two components usually derived from human donorsa concentrate of fibrinogen and other procoagulants reconstituted in aprotinin solution and a thrombin-calcium solution. The two components are mixed at the time of application by various delivery systems. Because of variable reported results using fibrin glue to lessen AAL, the present study was designed to evaluate its efficacy when delivered with a simple fine mist, pressurized aerosol system.
| Material and methods |
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All procedures were performed by residents under the direct supervision of one of two thoracic surgeons. All resections were carried out using standard dissection and stapling techniques. At the conclusion of the resection patients were randomly assigned in the operating room to control or treatment groups in a 1:1 ratio, regardless of identifiable air leak, by opening a sealed envelope. Patients assigned to the control group underwent no additional interventions. Patients assigned to the experimental group were treated with an application of 5 mL of fibrin glue using the HemaMyst system (Hemacure Corporation, Sarasota, FL). This device provides a fine aerosolized mist spray of fibrin glue under pressure (Fig 1). Application is controlled by a foot pedal and can be stopped and restarted without the problem of the glue congealing. This method allows precise coverage of large surfaces using small amounts of glue components. After pleural irrigation the lung was partially reinflated. Raw and stapled lung surfaces were sprayed with a portion of the fibrin glue. The quantity was left to the surgeons discretion. This spray was followed by the application of fibrin glue to the mediastinal lymph node bed when applicable and then spraying the remainder of fibrin glue on the dissected or stapled lung and bronchial stump. The lung was then left unventilated until completion of placement of the paracostal sutures. One or two chest drains were placed according to the surgeons standard practice. Preparation of the glue components was accomplished in about 5 minutes. Mist application took 1 minute or less.
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The data were analyzed using the software Statistical Package for the Social Sciences (SPSS Inc, Chicago, IL) system. Quantitative variables were analyzed using a Students t test. Qualitative variables were evaluated with the
2 test and Fishers exact test.
| Results |
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| Comment |
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Postoperative measures to limit the duration of AAL include early conversion to waterseal [2, 3], instillation of talc or other sclerosing/sealing agent including autologous blood [15] through the chest drains, endobronchial occlusion of small feeding airways [16], and thoracoscopic application of fibrin glue [17]. Adjunctive intraoperative maneuvers include space reduction by formation of an apical pleural "tent" [19], induction of pneumoperitoneum [20], diaphragmatic relocation [21], electrocautery or laser [22] on lung parenchyma, staple line buttressing [46], and the application of topical agents.
Among topical agents, recent attention has focused on synthetic bioresorbable systems [10, 11, 23]. Table 4 summarizes recent reports. The sealant is a water-soluble polyethylene glycol gel and is applied in a three-step process. First a primer is applied, followed by the sealant. Photopolymerization is accomplished with a xenon light wand. Marchiarini and associates [23] reported a study in pigs in which sealant was successful in closing parenchymal staple lines and bronchial stumps. They followed this with a randomized clinical series that included 15 sealant patients and 11 controls. All intraoperative leaks were sealed in the treatment group versus in only 18% of controls. Some treatment patients developed leaks subsequently but the overall leak-free postoperative course was significantly higher with sealant use (77% versus 9%). Time to tube removal and LOS were not different. There was one empyema in the treated patients, necessitating completion pneumonectomy. Wain and associates [11] reported a favorable experience with this method in a four-center randomized trial including 172 patients. They noted a significant difference in the absence of AAL at the conclusion of operation in favor of the sealant group (92% versus 29% control). Despite the development of AAL at some point postoperatively in a high proportion of sealant patients, the overall incidence of AAL was significantly less in the treated group (61% versus 89% control). The mean duration of AAL was also less in the sealant cohort. There was, however, no significant difference in the time to chest tube removal or in postoperative LOS. Alveolar air leak persisted at 7 days in 2.5% of treated cases and 7% of controls. Porte and associates [10] also reported a randomized trial. In contrast to the previous series, only patients with AAL at the conclusion of lobectomy were included. There were 59 treatment patients and 61 controls. There was a significant decrease in intraoperative AAL after sealant application (38.5% versus 59.9% control), percentage of patients free of air leak at 4 days (87.2% versus 58.5%control), and mean time to last observable AAL (33.7 versus 63.2 hours control). Alveolar air leak at day 6 did not differ significantly, however, and was quite high (86.9% sealant versus 78% control) nor was there a shorter LOS. Empyema with drainage of infected sealant was noted in 4 patients and benign space problems were seen in more of the treated cases. Although the authors suggest that sealant may act as a foreign body leading to infection, the differences were not statistically significant. This series is difficult to evaluate because of an unusual practice of removing all chest tubes on postoperative day 6 regardless of the presence or absence of AAL. Also a very high proportion of patients required additional drainage after tube removal (12 of 59 sealant, 13 of 61 control). Other sealants showing promise in animal models include a biologic hydrogel glue [9] and collagen membrane polyglycolic acid patches [12].
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The present study represents the largest randomized trial of fibrin glue in pulmonary resection and is the only trial using a blinded observer. Our finding of reduced incidence of AAL and PAAL as well as earlier time to drain removal in treated patients, in contrast to earlier studies, may be related to the amount of product applied and to the method of application. We used 5 mL in all cases. In addition we believe that the pressurized mist system is superior to the two-syringe technique in which manual pressure is the sole driving force. The pressurized system yields a fine spray that allows precise application of a smooth layer of glue to the target areas. The ability to stop and resume the application without congealing of the components is a great advantage that allows application of additional layers where deemed necessary. Although postoperative LOS was comparable between the two groups, our LOS represents one of the shortest reported in the literature. We agree with Cerfolio [29] questioning why LOS remains high despite shorter duration of air leak achieved by various approaches.
A potential shortcoming of our series is that decisions regarding tube management and patient discharge were not set by the study protocol and were not blinded to the attending surgeons. It may be argued, however, that this is a better means of evaluating sealants than a strict protocol that changes routine patterns of care. The main area in which this issue might bias the results is in the recording of time to cessation of air leak and tube removal in patients discharged with valves; there were only 9 such cases and they were seen at least every third day. Another criticism might be that the degree of AAL was not quantified [29]. However, AAL quantification is not at present the standard of care, remains unproven in terms of clinical decision-making and its introduction in this experience would be a change in our current practice pattern, thus adding another variable.
A general concern with fibrin glue is transmission of blood-borne diseases. We are not aware of any instances of this problem. One recent study [30] showed 20% transmission of human parvovirus B19, a usually innocuous virus but a potential pathogen in immunocompromised hosts. The use of a rapidly prepared autologous fibrin glue, reported experimentally [31], would address this issue.
In summary we report a randomized experience using aerosolized fibrin glue in lung resection. The method is simple and effective. Further studies with synthetic sealants, patches, fibrin glue, and autologous agents are needed. In addition to efficacy, cost analysis will have to be assessed. Although LOS is an important factor in cost, use of outpatient resources also plays a role. As we found no difference in drainage, a lesser quantity of glue applied only to lung parenchyma may reduce cost. The cost of fibrin glue varies between $70 and $90 per cc. Routine versus selective use of glue also needs clarification. We have begun a randomized study confined to patients with intraoperative AAL.Table 4
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