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Furukawa K, Ishida J, Yamaguchi G, Usuda J, Tsutsui H, Saito M, Konaka C, Kato H. The role of airway stent placement in the management of tracheobronchial stenosis caused by inoperable advanced lung cancer. Surg Today 2010; 40:315-20. [PMID: 20339985 DOI: 10.1007/s00595-008-4058-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Accepted: 04/28/2008] [Indexed: 12/17/2022]
Abstract
PURPOSE To our knowledge there is no in-depth report on the benefits of airway stenting, which focuses specifically on patients with inoperable advanced lung cancer causing severe central airway obstruction. We evaluated the role of airway stenting as one aspect of the multidisciplinary management of advanced lung cancer. METHODS We performed airway stenting in 40 lung cancer patients, placing a total of 58 stents. Stenting was done as a final modality in 22 patients with terminal-stage lung cancer (group A). The other 18 patients received additional therapy after stenting (group B), 12 (66.7%) of whom were treatment-naïve on admission. RESULTS The performance status (PS) and Hugh-Jones classification (H-J) scores improved in both groups after stenting: from 3.56 to 2.48 (P = 0.001) and 4.29 to 3.20 (P = 0.004) in group A, and from 3.15 to 1.25 (P < 0.001) and 4.10 to 2.10 (P < 0.001) in group B, respectively. The median survival time and 1-year survival rate after stenting were 1.6 months and 5.1%, respectively, in group A, and 5.6 months and 25.0%, respectively, in group B. CONCLUSIONS Airway stenting followed by adjuvant therapy may improve the survival of treatment-naïve patients with severe symptomatic airway obstruction caused by advanced lung cancer.
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Affiliation(s)
- Kinya Furukawa
- Department of Thoracic Surgery, Tokyo Medical University, Kasumigaura Hospital, 3-20-1 Chuo, Ami-machi, Inashiki-gun, Ibaraki, 300-0395, Japan
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Kim JH, Shin JH, Song HY, Shim TS, Yoon CJ, Ko GY. Benign tracheobronchial strictures: long-term results and factors affecting airway patency after temporary stent placement. AJR Am J Roentgenol 2007; 188:1033-8. [PMID: 17377041 DOI: 10.2214/ajr.06.0888] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
OBJECTIVE The purpose of our study was to evaluate long-term results and identify factors affecting airway patency after temporary placement of a covered, retrievable nitinol stent for benign tracheobronchial strictures. MATERIALS AND METHODS Polyurethane or polytetrafluoroethylene (PTFE)-covered retrievable expandable nitinol stents were placed fluoroscopically in 24 patients with benign tracheobronchial strictures. Improvement in respiratory status and complications were evaluated. Maintained patency of airway after temporary stenting was calculated and compared between the 2- and 6-month stenting groups. Factors for maintained patency after temporary stenting were evaluated. RESULTS A total of 30 stents were successfully placed and well tolerated in 24 patients. Tissue hyperplasia, stent migration, and bronchial obstruction of the left upper lobe occurred in 36.7%, 13.3%, and 3.3% of patients, respectively. All stents were successfully removed electively either 2 (n = 12) or 6 (n = 12) months after placement or when complications occurred (n = 6). During the follow-up period (mean, 24 months), dyspnea recurred in 15 of the 24 patients. The 6-month stenting group showed a lower recurrence rate (41.7% vs 83.3%, p = 0.045) and a better mean maintained patency (39.7 +/- 7.8 vs 9.4 +/- 5.4 months, p = 0.001) than the 2-month stenting group. Multivariate analysis showed that duration of stent placement (p = 0.002) and the occurrence of tissue hyperplasia (p = 0.026) were associated with maintained patency after temporary stenting. CONCLUSION Temporary placement of a covered, retrievable, expandable nitinol stent may be a safe and effective treatment for benign tracheobronchial strictures during the period the stent is in place. A high symptomatic recurrence rate of 62.5% was found after stent removal. Shortterm placement of the stent and tissue hyperplasia were associated with decreased airway patency.
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Affiliation(s)
- Jin Hyoung Kim
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap-dong, Songpa-gu, Seoul 138-736, South Korea
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Kim JH, Kim YH, Shin JH, Sung DJ, Shim TS, Cho SB, OH YM, Chung KB, Song HY, Cha SH, Park HS, Um JW. Deep tracheal laceration after balloon dilation for benign tracheobronchial stenosis: case reports of two patients. Br J Radiol 2006; 79:529-35. [PMID: 16714758 DOI: 10.1259/bjr/17839516] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
We report two cases of deep tracheal laceration in female patients after balloon dilation for benign tracheobronchial stenosis. Immediate post-procedure bronchoscopy and CT including 3D reconstructions showed deep lacerations in the posterior tracheal wall. Clinically, the patients' dyspnoea subsided and there has been no recurrence during follow-up after balloon dilation. On the follow-up 3D-reconstructed CT scans obtained 2 months and 8 months following balloon dilation, respectively, the lacerations had healed completely and there was considerable improvement in lumen size.
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Affiliation(s)
- J H Kim
- Department of Radiology, Korea University College of Medicine, Seoul
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Kim JH, Shin JH, Shim TS, Yoon CJ, Lim JO, Ko GY, Yoon HK, Sung KB, Song HY. Efficacy and Safety of a Retrieval Hook for Removal of Retrievable Expandable Tracheobronchial Stents. J Vasc Interv Radiol 2004; 15:697-705. [PMID: 15231883 DOI: 10.1097/01.rvi.0000133506.09685.a3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To evaluate the efficacy and safety of use of a retrieval hook for removal of retrievable expandable tracheobronchial stents. MATERIALS AND METHODS With fluoroscopic guidance, a retrieval hook was used to remove 45 retrievable expandable tracheobronchial stents in 31 patients. Indications for stent removal included tissue hyperplasia (n = 16), stent migration (n = 10), stent misplacement (n = 2), tumor overgrowth (n = 2), persistent gastrobronchial fistula (n = 1), and incompletely expanded stent (n = 1). Thirteen stents were electively removed after temporary use. The success rate, causes of failure, and complications related to stent removal with a retrieval hook were analyzed. RESULTS Forty-one of 45 stents (91.1%) were successfully removed with a retrieval hook. The following difficulties were encountered: disruption of the polyurethane membrane (n = 3) and an untied drawstring (n = 1). The removal procedure failed in four cases (8.9%) because of excessive tissue hyperplasia (n = 4) in the proximal portion of the stent. The hook wire fractured in two of the four failed cases. The overall complication rate was 4.4% (minor bleeding, n = 2). CONCLUSION For complications with or temporary use of retrievable expandable tracheobronchial stents, removal with a retrievable hook shows promising initial results.
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Affiliation(s)
- Jin Hyoung Kim
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Pungnap-2dong, Songpa-gu, Seoul 138-736, Korea
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Shin JH, Kim SW, Shim TS, Jung GS, Kim TH, Ko GY, Song HY. Malignant tracheobronchial strictures: palliation with covered retrievable expandable nitinol stent. J Vasc Interv Radiol 2004; 14:1525-34. [PMID: 14654487 DOI: 10.1097/01.rvi.0000099525.29957.34] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
PURPOSE To evaluate the safety and clinical effectiveness of a covered retrievable expandable nitinol stent for the treatment of malignant tracheobronchial stricture and/or esophagorespiratory fistula (ERF). MATERIALS AND METHODS With fluoroscopic guidance, stents were placed in 35 symptomatic patients with malignant tracheobronchial stricture and/or ERF in most cases caused by lung or esophageal cancer. The site of stricture was most commonly at the trachea or left main bronchus. If there were complications, the stent was removed with a retrieval set. Nine patients had combined symptomatic ERF. RESULTS A total of 47 tracheobronchial stents were placed and were technically successful and well-tolerated in all patients. Improvement of dyspnea was achieved in 92% of the patients (24 of 26 patients). Associated ERF in nine patients was effectively treated with tracheobronchial stent placement with or without esophageal stent placement. Stent migration, tumor overgrowth, symptomatic sputum retention, and hemoptysis occurred in 17% (6/35), 6% (2/35), 20% (7/35), and 17% (6/35) of patients, respectively. There were no documented cases of tumor ingrowth. Stent removal was performed easily in five patients when stent migration (n = 2), severe pain (n = 1), tumor overgrowth (n = 1), or persistent gastrobronchial fistula (n = 1) developed. All patients died 2 days to 26 weeks (mean, 9.62 weeks) after stent placement because of disease progression (n = 18), pneumonia (n = 9), hemoptysis (n = 5), or unknown cause (n = 3). CONCLUSION Use of a covered retrievable expandable nitinol stent is a safe and effective method for relieving dyspnea. This procedure contributed to improved quality of life for patients with malignant tracheobronchial stricture and/or ERF. Stent retrievability was useful in resolving stent-related complications.
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Affiliation(s)
- Ji Hoon Shin
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-2dong, Songpa-gu, Seoul 138-736, Korea
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Lee KH, Ko GY, Song HY, Shim TS, Kim WS. Benign tracheobronchial stenoses: long-term clinical experience with balloon dilation. J Vasc Interv Radiol 2002; 13:909-14. [PMID: 12354825 DOI: 10.1016/s1051-0443(07)61774-6] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To assess the safety and long-term efficacy of balloon dilation in the treatment of benign tracheobronchial stenosis. MATERIALS AND METHODS Balloon dilation was performed under fluoroscopic guidance in 59 consecutive patients with benign tracheobronchial stenosis. Most patients had tuberculosis (48 of 59, 81%). Two to three serial balloon insufflations were performed for 5-180 seconds (mean, 85 sec) with inflation pressures as high as 16 atm with use of 6-20-mm-diameter balloon catheters. Patients with clinical evidence of restenosis underwent repeat balloon dilation. Patients were followed for 12-42 months (mean, 32 mo). RESULTS A total of 101 balloon dilation sessions were performed in 59 patients, with a range of one to four sessions per patient (mean, 1.7 sessions). Initial symptomatic improvement was achieved in 49 (83%) of the 59 patients; however, during the follow-up period, 39 (80%) of the 49 patients experienced recurrence of their symptoms. The primary patency rates at 3, 6, 9, 12, 18, 24, and 32 months were 92%, 60%, 45%, 24%, 20%, 20%, and 20%, respectively. The secondary patency rates at 3, 6, 9, 12, 18, 24, and 32 months were 92%, 87%, 75%, 43%, 43%, 43%, and 43%, respectively. Procedure-related major complications of deep mucosal laceration (n = 2) and bronchospasm (n = 1) occurred in three patients, but they experienced no subsequent problems. CONCLUSION Although the recurrence rate is high during the long-term follow-up period, balloon dilation seems to be a safe primary treatment modality for benign tracheobronchial stenoses and has an acceptable secondary patency rate.
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Affiliation(s)
- Kwang-Hun Lee
- Departments of Diagnostic Radiology and Research, Institute of Radiological Science, Yonesei University College of Medicine,Yong Dong Severance Hospital, Seoul, South Korea
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Hwang JC, Song HY, Kang SG, Suh JH, Ko GY, Lee DH, Kim TH, Jeong YK, Lee JH. Covered retrievable tracheobronchial hinged stent: an experimental study in dogs. J Vasc Interv Radiol 2001; 12:1429-36. [PMID: 11742020 DOI: 10.1016/s1051-0443(07)61704-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To evaluate the safety and technical feasibility of the use of a covered retrievable tracheobronchial hinged stent and investigate the histopathologic airway changes after placement and removal of the stent in dogs. MATERIALS AND METHODS The experimental stent was composed of tracheal and bronchial stents that were connected together at their ends. Each stent was woven from a single thread of 0.2-mm-diameter nitinol wire filament in a tubular configuration and covered with polyurethane solution by a dipping method. Drawstrings were attached at the upper end of the tracheal stent for stent removal. Under fluoroscopic guidance, 20 stents were placed at the lower trachea and left main bronchus in 20 dogs and were electively removed 4 weeks (n = 10) or 8 weeks (n = 10) after placement. Ten dogs were killed just after stent removal and the remaining 10 were killed 2 weeks after stent removal. RESULT Stents were successfully placed in all dogs. Pneumonia was observed in three dogs. Stent migration occurred in seven dogs (35%). Except for two cases of stent expectoration, 18 stents were easily removed within a few minutes. There was considerable granulation tissue proliferation and inflammatory reaction in the airways of the dogs that were killed just after stent removal. The pathologic changes of the airways returned to almost-normal conditions 2 weeks after stent removal. CONCLUSION Placement and removal of a covered retrievable tracheobronchial hinged stent seems to be feasible, and histopathologic changes of the airway related to the stents returned to normal 2 weeks after stent removal.
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Affiliation(s)
- J C Hwang
- Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul.
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Park JW, Pavcnik D, Uchida BT, Timmermans H, Corless CL, Yamakado K, Yamada K, Keller FS, Rösch J. Small intestinal submucosa covered expandable Z stents for treatment of tracheal injury: an experimental pilot study in swine. J Vasc Interv Radiol 2000; 11:1325-30. [PMID: 11099244 DOI: 10.1016/s1051-0443(07)61310-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
PURPOSE To evaluate efficacy of small intestinal submucosa (SIS) as a stent covering in healing experimentally created tracheal defects and to explore the trachea's reaction to placement of SIS-covered stents. MATERIAL AND METHODS A tracheal defect with a diameter of approximately 10 mm was created in six swine with use of a blade or electrocauterization. A double-body, self-expandable SIS-covered Gianturco Rösch Z stent was placed into the trachea to cover the defect. The animals were observed, and were killed when they developed respiratory problems. Autopsy and histologic studies were performed. RESULTS The SIS-covered stents were accurately placed without immediate complications related to placement. All animals developed respiratory problems on follow-up. One animal died 9 days after procedure because of pneumonia, the others five were killed at 12, 17, 18, 28, and 56 days because of stridor, wheezing, and cough. At autopsy and histology, the tracheal defects were found to be completely healed, with epithelial lining and regeneration of submucosal glands. Animals whose defects were created with a blade demonstrated cartilage remodeling between 9 and 18 days, and apparent deposition of new cartilage at 28 days after SIS placement. The defects made by electrocauterization showed only fibrous tissue with no cartilage regeneration. The tracheal lumen was narrowed by overgrowth of granulation tissue, particularly at the end wires of the stents. In three animals, polypoid masses caused 60%, 70%, and 80% tracheal obstruction, respectively. CONCLUSION Placement of SIS-covered stents contributed to rapid and effective healing of large tracheal defects. Rigidity and oversizing of Gianturco Rösch Z stents led to secondary changes of the tracheal wall, causing significant airway obstructions. Smaller size and flexible stents should be selected for future work.
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Affiliation(s)
- J W Park
- Dotter Interventional Institute, Oregon Health Sciences University and Portland Veterans Administration Medical Center, 97201, USA
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Abstract
Endoscopic treatment of endobronchial obstructions is becoming increasingly important. Tracheobronchial stents often are needed in the treatment of obstructions from submucosal or extrabronchial lesions. Tube stents have been available since the early 1960s but are underused because their insertion requires the use of a rigid bronchoscope. With the recent development of metallic stents, interventional radiologists increasingly are involved in the treatment of tracheobronchial obstructions. Metallic stents, easily placed with flexible bronchoscopy, are growing in popularity. All available tracheobronchial stents have been shown in various clinical series to be able to achieve immediate resolution of respiratory symptoms from various tracheobronchial obstructions. A stent's performance, however, should not be based solely on short-term response. Presently, there is no ideal stent because none is free of complications and none are able to consistently maintain life-long patency. Gianturco stents are associated with serious major complications (bronchial perforations and strut fractures) and are no longer recommended for use in the tracheobronchial tree. The Palmaz stent has also fallen into disfavor, because a strong external force, such as a vigorous cough, can recompress it. The Strecker stent can only be used in smaller airways, but may be useful in the accurate stenting of short segment stenoses because it does not foreshorten on deployment. The Wallstent and Ultraflex are our present metallic stents of choice. Both are easy to deploy, available in covered forms, exert adequate radial force, remain relatively stable in position, and have good longitudinal flexibility for use in tortuous airways. Disadvantages include excessive granulation tissue formation and difficulty of removal once the stent has been epithelialized. Metallic stents should be chosen very carefully for use in benign lesions with ongoing active local inflammation or when temporary stenting is needed. In the absence of an ideal stent, technologic advancements will continue. Potential developments include removable metallic stents, biodegradable stents, and chemically and radioactively coated stents. Unquestionably, the expanding stent market will drive scientific research toward the development of the ideal stent. Clearly, physicians need to be ready to assess these technologic advancements.
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Affiliation(s)
- A L Rafanan
- Department of Pulmonary and Critical Care Medicine, Cleveland Clinic Foundation, Ohio 44195, USA
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Song HY, Shim TS, Kang SG, Jung GS, Lee DY, Kim TH, Park S, Ahn YM, Kim WS. Tracheobronchial strictures: treatment with a polyurethane-covered retrievable expandable nitinol stent--initial experience. Radiology 1999; 213:905-12. [PMID: 10580974 DOI: 10.1148/radiology.213.3.r99dc02905] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A polyurethane-covered retrievable expandable stent was placed in 13 patients with tracheobronchial strictures. In four patients with benign strictures, the stent was removed with use of a retrieval hook 2-6 months after placement. After stent removal, three of the four patients did not need further treatment. The retrievable stent warrants further investigation in the treatment of tracheobronchial strictures.
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Affiliation(s)
- H Y Song
- Dept of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Korea.
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Remacle M, Lawson G, Gaafar A, Keghian J, Jamart J. Palliative treatment for tracheal stenoses using carbon dioxide laser and the Gianturco stent. Long-term results. Ann Otol Rhinol Laryngol 1999; 108:842-50. [PMID: 10527274 DOI: 10.1177/000348949910800905] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Between September 1992 and March 1998, the self-expandable Gianturco prosthesis was inserted in 23 patients suffering from tracheal stenosis. After radial incision and dilation of the stenosis as described by Shapshay, the positioning of the stent was performed during an endoscopic procedure under optical control. The prosthesis used was a double-ring stent 50 mm long and 20 mm in diameter. The follow-up period ranged between 0.5 and 67 months with an average of 31 +/- 18 months. Pulmonary function tests showed an average improvement of the peak expiratory flow (50%) from preoperative results of 1.06 +/- 0.60 L/s to short-term postoperative results of 2.08 +/- 0.78 L/s and long-term postoperative results of 2.11 +/- 0.78 L/s. The mean peak inspiratory flow (50%) improved from 1.43 +/- 0.85 L/s to 2.40 +/- 1.29 L/s at short term and to 2.56 +/- 1.20 L/s at long term. Eight patients out of the 23 had to undergo a second endoscopic procedure: 3 patients for granuloma vaporization; 1 patient to change a malpositioned stent; 2 patients to add a second stent because of insufficient tracheal enlargement; and 2 patients to resect mucosal membranes between the 2 stent rings and to place a second stent. Optical control of the accurate positioning and use of this model of Gianturco prosthesis helped to avoid the severe complications described in the literature (migration, extrusion, fracture, wall erosion. and hemorrhage). The follow-up must particularly target the prevention of granulomas. The self-expandable Gianturco prosthesis can be advocated for long-term palliative treatment of tracheal stenoses that are inoperable by an external surgical approach.
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Affiliation(s)
- M Remacle
- Department of Otorhinolaryngology-Head and Neck Surgery, University Hospital of Louvain at Mont-Godinne, Yvoir, Belgium
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Ruegemer JL, Perkins JA, Azarow KS, O'Bryant LK, Nielsen RE, Thomas RW. Effect of the Palmaz balloon-expandable metallic stent in the trachea of pigs. Otolaryngol Head Neck Surg 1999; 121:92-7. [PMID: 10388886 DOI: 10.1016/s0194-5998(99)70132-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Endoscopically placed airway stents offer a viable option in primary or adjunctive treatment of severe pediatric tracheobronchial stenoses. Optimistic clinical reports substantiate the need for experimental studies to more effectively evaluate their clinical role. Development of an animal model comparable with the pediatric airway, amenable to endoscopic instrumentation, and capable of assessing effect on growth was the purpose of this pilot project. Nine 4-week-old piglets underwent endoscopic midtracheal placement of the balloon-expandable Palmaz metallic stent. Initial expansion and stent position were verified fluoroscopically and by direct videobronchoscopy. Serial endoscopic examination and stent reexpansion were performed 2 and 4 weeks after stent insertion. Animal weight, clinical tolerance, tracheal growth, and stent integrity were observed. Tracheal inflammation was evaluated grossly and by objective histopathologic criteria. Successful endotracheal stent placement and expansion were accomplished in all piglets. One pig died of anesthesia complications less than 24 hours after stent insertion. The remaining pigs exhibited excellent clinical tolerance through experiment completion. No detrimental effect on growth was noted, and effective dilatation of the stented tracheal region was observed. Stent incorporation was evident with significant mucosal ingrowth. Inflammation in the form of nonobstructing granulation tissue was present, and no evidence of necrosis or cartilage invasion was evident. The piglet trachea appears to be an excellent model for evaluation of expandable metallic airway stents in management of congenital and acquired tracheobronchial stenoses.
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Affiliation(s)
- J L Ruegemer
- Madigan Army Medical Center, Tacoma, Washington, USA
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Pron G, Common A, Simons M, Ho CS. Interventional radiology and the use of metal stents in nonvascular clinical practice: a systematic overview. J Vasc Interv Radiol 1999; 10:613-28. [PMID: 10357489 DOI: 10.1016/s1051-0443(99)70092-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
PURPOSE The intent of this systematic overview was to describe the clinical role of metal stents in nonvascular health care interventions and the level of evidence supporting their use. MATERIALS AND METHODS Structured searches of Medline were conducted and limited to original peer-reviewed articles published in English. RESULTS Clinical practice involving metal stents was reported in more than 109 clinical series involving 4,753 patients. Stents were placed mainly for palliation of malignant biliary, esophageal, and airway obstruction in patients who were untreatable or had surgically unresectable lesions. Assessment of these interventions has so far centered on safety and technical success. Efficacy, quality of life, and costing factors were not routinely reported. Randomized trial evidence was available but limited; six randomized trials involving metal stents have been reported. Three trials involved biliary malignant obstruction, and all three reported metal stent (132 patients) palliation to be superior to plastic stent palliation (136 patients) based on longer patency and lower reintervention costs. Safety and complication differences between stents, however, were inconsistent across trials. In three trials involving esophageal malignant obstruction, metal stent (82 patients) palliation was reported to be superior to plastic stent (41 patients), based on lower complication and reintervention rates, and superior to laser therapy (18 patients), based on better dysphagia relief. CONCLUSION Use of metal stents has been reported for obstructed ducts and passageways of most body systems. There is, however, limited controlled trial evidence confirming the advantages of their use over plastic stents or other forms of treatment.
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Affiliation(s)
- G Pron
- Department of Medical Imaging, University of Toronto, Ontario
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Expandable Metallic Stents in Tracheobronchial Stenoses: Strategies for Implantation. J Vasc Interv Radiol 1999. [DOI: 10.1016/s1051-0443(99)71088-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Mitsuoka M, Hayashi A, Takamori S, Tayama K, Shirouzu K. Experimental study of the histocompatibility of covered expandable metallic stents in the trachea. Chest 1998; 114:110-4. [PMID: 9674456 DOI: 10.1378/chest.114.1.110] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
STUDY OBJECTIVES To evaluate the histocompatibility of four different materials used to cover expandable metallic stents. DESIGN Prospective, randomized, unblinded study. SETTING Animal research laboratory of Kurume University. PATIENTS OR PARTICIPANTS Twenty 12- to 18-kg mongrel dogs. INTERVENTIONS Handmade Gianturco-type stents with six bends, 20 mm in length, and 15 to 20 mm in diameter were covered using four different materials: polypropylene mesh, silicone-coated mesh, polyester mesh, and ePTFE. Covered stents were inserted into the trachea after i.v. anesthesia. Five animals were used in each group. MEASUREMENTS AND RESULTS Postinsertion status was observed using clinical and bronchoscopy measures 7, 14, 28, and 56 days after intervention. Eight weeks after stent insertion, the tracheal specimens were studied pathologically. A scoring system was used to evaluate the histocompatibility of covered stents in each study group. The mean of clinical scores in the polypropylene group was 1.84+/-0.36, which was significantly higher than those in the groups of silicone, polyester, and ePTFE. The means of histopathologic scores in the polypropylene group and the silicone group were 1.60+/-0.55, which were significantly higher than those in groups of polyester and ePTFE. CONCLUSIONS Polypropylene mesh cover was more suitable than silicone-coated mesh, polyester mesh, and ePTFE because of its excellent histocompatibility.
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Affiliation(s)
- M Mitsuoka
- The Department of Surgery, Kurume University, School of Medicine, Fukuoka, Japan
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Expandable Metallic Stents in Tracheobronchial Stenoses. J Vasc Interv Radiol 1997. [DOI: 10.1016/s1051-0443(97)70078-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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