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  • 1
    ISSN: 1433-0385
    Keywords: Key words: Stromal tumors ; GIST ; Surgical therapy ; Gastrointestinal tract. ; Schlüsselwörter: Stromatumoren ; GIST ; chirurgische Therapie ; Gastrointestinaltrakt.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Die gastrointestinalen Stromatumoren (GIST) sind eine seltene, auch heute noch nicht vollständig aufgeklärte Gruppe von Neoplasien des Magen-Darm-Trakts. Trotz vieler Fortschritte der diagnostischen Möglichkeiten ist eine Zuordnung der GIST hinsichtlich ihrer Histogenese und Dignität nicht eindeutig. Im Zeitraum von 1994 bis 1998 wurden in der Klinik für Chirurgie 18 Patienten mit einem GIST operiert. Dabei handelte es sich um 12 (67 %) gastrale und 6 (33 %) intestinale Stromatumoren. Der Primärtumor konnte bei allen Patienten durch eine R0-Resektion entfernt werden. Bei 6 Patienten kam es zu einer hämatogenen Lebermetastasierung, die Größe des Primärtumors betrug bei diesen Patienten mehr als 10 cm. Eine extrahepatische Fernmetastasierung ließ sich in allen untersuchten Fällen nicht nachweisen. Eine Lymphknotenmetastasierung konnte in den regionären Lymphknoten nicht festgestellt werden. Eine systematische Lymphadenektomie ist nicht indiziert. Die histologische Beurteilung der Dignität erfolgte auf der Grundlage der von Lewin, Weinstein und Riddell vorgeschlagenen Richtlinien. Das derzeit gesicherte therapeutische Vorgehen besteht in der kurativen Resektion des Primärtumors sowie der Metastasen mit histologisch tumorfreien Resektionsrändern. Das Tumorrezidiv ist ebenso zu behandeln. Adjuvante oder neoadjuvante chemotherapeutische Ansätze zeigen bisher keine Erfolge.
    Notes: Summary. Gastrointestinal stromal tumors (GIST), which form a rare group of neoplasias of the gastrointestinal tract, have not yet been fully investigated. Although good progress has been made in their diagnosis, classification of these lesions with regard to their histogenesis and biological behavior remains problematic. Between 1994 and 1998, 18 GIST patients underwere operation in the Department of Surgery. Twelve of these patients (67 %) had stromal tumors in the stomach, and six (33 %) had intestinal stromal tumors. The primary tumor could be removed in all patients with R0 resection. Six patients developed hematogenous liver metastasis, with the size of their primary tumor exceeding 10 cm. Extrahepatic distant metastases were not found in any case. Lymphadenectomy showed that lymph node metastases did not occur. Histological evaluation was made according to the guidelines of Lewin, Weinstein and Riddell. Currently established therapy is limited to complete surgical resection of the primary tumor and its metastases. Adjuvant or neoadjuvant chemotherapy approaches have failed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 14 (2000), S. 1180-1184 
    ISSN: 1432-2218
    Keywords: Key words: Pneumoperitoneum — Carbon dioxide — Laparoscopic surgery — Lung — Oxidative stress — Lipid peroxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Clinical trials have found that the pneumoperitoneum has potentially hazardous side effects. The biochemical basis of organ injury induced by pneumoperitoneum is, however, not well defined. Since oxidative stress is believed to play an important role in many pathological conditions, we set out to examine oxidative stress markers in the lung, liver, kidney, and pancreas by using a rat model of laparoscopy with CO2 pneumoperitoneum and comparing it to a group with gasless laparoscopy. Methods: Malondialdehyde (for lipid peroxidation), protein-bound carbonyls (for protein oxidation), reduced and oxidized glutathione, and the neutrophil marker myeloperoxidase were evaluated in tissue homogenates at 2 h, 6 h, and 18 h after laparoscopy. Immunoblotting was used to analyze the modification of lung proteins by 4-hydroxynonenal at 6 h. Results: Significant lipid peroxidation was found selectively in lungs at 2 h and 6 h after CO2 pneumoperitoneum. This was accompanied by a loss of glutathione but only minor protein oxidation. Further, lung proteins were clearly modified by the aldehydic product of lipid peroxidation 4-hydroxynonenal. Myeloperoxidase in lungs increased continuously up to 18 h in both experimental groups, but there were higher levels in the group with pneumoperitoneum. Conclusion: Oxidative stress is likely to contribute to the impairment of pulmonary function after laparoscopic operations using a CO2 pneumoperitoneum.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 14 (2000), S. 1146-1148 
    ISSN: 1432-2218
    Keywords: Key words: Esophageal tumor — Thoracoscopy — Esophagoscopy — Benign tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Benign tumors of the esophagus are very rare, accounting for only 0.1–2% of all esophageal tumors. Conventional treatment consists of thoracotomy adapted to the location of the tumor, followed by enucleation of the lesion. This approach, however, involves major surgery. Minimally invasive surgery represents a viable therapeutic alternative, in particular for benign tumors. Methods: In four patients with a benign tumor of the esophagus, we carried out thoracoscopic enucleation under simultaneous esophagoscopy. Results: Using this combination of endoscopic procedures, the tumors were removed reliably and safely. Two of the lesions were intramural leiomyomas, and two were intramural myxoid cysts. Conclusion: This combination of endoscopic procedures represents a minimally invasive approach with correspondingly minor surgical trauma. Using simultaneous esophagoscopy and transillumination (diaphanoscopy) of the esophageal wall, the safety and accuracy of the dissection is increased, and the risk of mucosal perforation minimized.
    Type of Medium: Electronic Resource
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