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Featured researches published by Meinhard Classen.


Scandinavian Journal of Gastroenterology | 1981

Alternating Treatment of Common Bile Duct Stones with a Modified Glyceryl-1-Monooctanoate Preparation and a Bile Acid-EDTA Solution by Nasobiliary Tube

Ulrich Leuschner; D. Wurbs; H. Baumgärtel; E. B. Helm; Meinhard Classen

Twenty patients with bile duct stones were treated via an indwelling nasobiliary tube with a modified Capmul 8210 preparation (GMOC) and alternating with a bile salt-EDTA (BA-EDTA) solution for an average of 12 days. In vitro the dissolution capacity of GMOC and BA-EDTA for cholesterol stones was higher than that of Capmul 8210. The nasobiliary tube was tolerated well for a maximum of 84 days; this renders us independent of the T-tube. The therapeutic success rate of GMOC was 64%, even though we treated mostly old and large concrements. Side effects occurred markedly less than with Capmul 8210. In patients with acute cholecystitis or cholangitis the clinical course improved under therapy, and there was no deterioration of a chronic condition.


Scandinavian Journal of Gastroenterology | 1986

Benign Lesions of the Upper GI Tract by Means of Endoscopic Ultrasonography

W. D. Strohm; Meinhard Classen

In contrast to conventional ultrasound tomography endoscopic ultrasonography (EUS) allows an exact evaluation of the wall of the upper GI tract. The gastric and esophageal walls give a typical five-layer image presumably corresponding to the mucosa (two inner layers), submucosa (middle echogenic layer), muscularis propria (outer echo-poor layer), and serosa (outer echogenic layer). A thickening of the mucosa may be demonstrated in Ménétriers disease. In patients with gastric antrum ulcers there is considerable thickening of the gastric wall, especially of the submucosa and muscularis. Benign gastric and esophageal submucosal tumors are easily localized between the different layers. They are easily distinguished from malignant processes by means of EUS. In patients with polypoid endoscopic aspect due to an impression from outside, a tumor can be easily excluded.


Acta Endoscopica | 1984

Les progrès diagnostiques de l'ultrasonographie endoscopique

W. D. Strohm; W. Kurtz; Meinhard Classen

RÉSUMÉLa tomographie endoscopique ð ultrasons (TEU) abolit les barrières classiques des ultrasons telles que les gaz et les os et procure un pouvoir de résolution supérieur grâce ð l’utilisation de hautes fréquences. Les données de l’anatomie sonographique sont complètement modifiées et elles nécessitent de plus une standardisation stricte des sections croisées et des positions. Le présent travail représente l’expérience de 110 patients examinés par TEU au niveau du tractus digestif supérieur et des organes environnants. Les maladies pancréatiques et les lésions des voies biliaires sont souvent mieux visualisées par TEU que par ultrasonographie conventionnelle. Les lésions tant bénignes que malignes de l’estomac et de l’œsophage sont décrites avec une précision jusqu’ici inconnue et la TEU est appelée ð devenir une méthode d’investigation d’importance primordiale au niveau des lésions du tractus digestif supérieur.SummaryEndoscopic ultrasound tomography (EUT) overcomes conventional ultrasound barriers like gas and bones and gives superior detail resolution due to the use of higher frequencies. The thoroughly changed sonoanatomy, however, exacts a strict standardization of cross sections and positions. In 110 patients we examined the upper GI tract and its surrounding organs by EUT. Pancreatic diseases and bile duct processes can often be better visualized by EUT than by conventional UT. The gastric and oesophageal wall with their benign and malignant lesions are depicted with hitherto unknown exactitude suggesting that EUT may become of primary importance in the diagnosis of lesions of the upper GI tract.


Scandinavian Journal of Gastroenterology | 1987

Staging of Gastric and Esophageal Carcinoma by Means of Endoscopic Ultrasonography

W. D. Strohm; Meinhard Classen

Endoscopic ultrasonography (EUS) enables an exact evaluation of the wall of the upper GI tract. The esophageal and the gastric wall give a typical five-layer image, presumably corresponding to the mucosa, submucosa, tunica muscularis propria, and serosa. Gastric ulcers are often accompanied by a thickening of the gastric wall (10.4 ± 3.7 mm) compared with the normal gastric wall (3.7 2 0.6 mm; p < 0.001). Malignant tumors show an irregular structure with infiltration into the wall and into neighboring tissues with destruction of the GI wall. Para-esophageal and para-gastric lymph node metastases can be visualized. Benign esophageal and gastric tumors are sharply delineated from the surrounding tissue. The results suggest that, by EUS, it is possible to differentiate carcinomas from benign submucosal tumors of the upper GI tract and to judge the extent of the infiltration and the stage of the malignant process.


Acta Endoscopica | 1982

Blind liver biopsy or guided biopsy ? A prospective study

M. Leuschner; U. Leuschner; K. Hübner; F. Hagenmüller; W. D. Strohm; Dietmar Wurbs; Meinhard Classen

SummaryBlind liver biopsy is sufficient for patients with diffuse-parenchymatous liver diseases. The accuracy rate of guided, laparoscopic liver biopsy is not enhanced.Laparoscopy is to be preferred to blind liver biopsy in focal disorders, since it provides with more information in patients with solitary carcinoma, cysts and other findings.The laparoscopist is being influenced by the knowledge of clinical data in making his diagnosis. The accuracy rate of laparoscopy is improved.The pathologist is but little or not at all influenced by clinical data.RésuméLa biopsie à l’aveugle est suffisante dans les altérations hépatiques parenchymateuses diffuses. La biopsie dirigée sous laparoscopie ne présente pas d’avantages.La laparoscopie est préférable à biopsie à l’aveugle dans les altérations focales et ne fournit pas d’informations supplémentaires chez les patients porteurs de lésions néoplasiques isolées, de kystes ou d’autres anomalies.Le laparoscopiste est influencé par la connaisssance des données cliniques et la précision de la laparoscopie s’en trouve majorée.Le pathologiste est peu ou pas influencé par les données cliniques.


Scandinavian Journal of Gastroenterology | 1985

Diurnal Rhythm of Bile Lipid Composition after Cholecystectomy and Papillotomy: Postpapillotomy Biliary Lithogenicity

W. Kurtz; U. Leuschner; S. Schneider; Meinhard Classen

The influence of the gallbladder and the sphincter of Oddi on the diurnal rhythm of bile lipid composition was assessed by determining the lithogenic index at 4-h intervals over a period of 24 h in 29 cholecystectomized and papillotomized patients with a nasobiliary tube receiving a normal hospital diet and in 9 during 1-day fast. With a normal diet, biliary cholesterol concentrations dropped during the daytime (p less than 0.05), and total biliary lipid, bile acid, phospholipid, and cholesterol concentrations rose at night (p less than 0.05). During fasting, total biliary lipid, phospholipid, and cholesterol concentrations rose continuously (p less than 0.01). Even with loss of function of the gallbladder and sphincter of Oddi, a diurnal rhythm of biliary lithogenicity persisted, caused mainly by cholesterol increases during fasting. Concomitant increases in phospholipids and, to a lesser extent, bile acids modulated these changes.


Acta Endoscopica | 1976

ERCP — Key for diagnosis in the cholestasis syndrome

Dietmar Wurbs; F. Hagenmüller; Meinhard Classen

SummaryIn presence of a cholestasis syndrome there exists a diagnostic necessity of success since the elimination of an extrahepatic cause avoids invalidism. With some experience the ERCP is a nearly riskless examination with high efficacy which is but little inconvenient for the patient and which is in an optimum way suited for differentiation of an obstructive jaundice. In single cases therapeutic interventions can immediately follow the diagnostic. The ERCP shall therefore be the first different intervention for etiological clearing of a cholestasis.ZusammenfassungBeim Vorliegen eines Cholestasesyndroms besteht ein diagnostischer Erfolgswang, da die Beseitigung eined extrahepatischen Ursache Siechtum verhindert. Die ERCP ist bei einiger Ubung als fast risikolose, den Patienten wenig belästigende Untersuchung mit hoher Effektivität in idealer Weise zur Differenzierung eines Verschlußikterus geeignet. In einzelnen Fällen sind therapeutische Eingriffe der Diagnostik gleich anzuschließen. Die ERCP soll deshalb der erste differente Eingriff bei der ätiologischen Abklärung einer Cholestase sein.RésuméEn présence d’une cholostase, le succès diagnostique est impératif puisque l’élimination d’une cause extrahépatique écarte l’invalidité. Idéalement, la ERCP est, dans des mains entraînées, très rentable pour établir le diagnostic différentiel d’un ictère d’origine extrahépatique. Elle présente peu de risque et peu d’inconfort pour le patient. Dans certains cas particuliers, elle a un but à la fois diagnostique et thérapeutique. La ERCP doit, dès lors être la première mesure qui mène au diagnostic étiologique d’une cholostase.Pour la traduction, nous remercions le Docteur F. Boemer, Université de Louvain.


Acta Endoscopica | 1975

Manométrie endoscopique semi-conductrice dans le tractus bilio-pancréatique

P. Vondrasek; G. Eberhardt; Meinhard Classen

RésuméLa manométrie endoscopique semi-conductrice (MES) permet des mesures de pression dans différents segments du système bilio-pancréatique par duodénoscopie.Chez 26 patients ne présentant pas de lésions biliaires ou pancréatiques, des mesures de pression furent effectuées dans la lumière duodénale, l’ampoule de Vater, la voie biliaire principale et le canal pancréatique, soit dans les conditions de base, soit après injection de glucagon et de pancréozymine.Nos résultats préliminaires permettent de conclure à un gradient croissant de la valeur de la pression de base dans l’ordre de mesures mentionnées ci-dessus.La chute de la pression après glucagon ou l’élévation après pancréozymine est reproductible dans tous les segments du système bilio-pancréatique.SummaryEndoscopic semiconductor manometry (ESM) permits pressure measurements in various sections of the pancreato-biliary system by means of duodenoscopy.In 26 persons with a healthy galbladder and pancreas pressures were measured in: lumen of the duodenum (n=26), Vater’s ampulla (n=22), bile duct (n=3), and pancreati duct (n=1) under basal conditions and also glucagon and pancreozymin.Preliminary results were determined. There is a rising gradient of the basal pressure value in the sequence mentioned.The fald in pressure/after glucagon or the rise in pressure after pancreozymin is reproductible in all sections.


Scandinavian Journal of Gastroenterology | 1984

Diagnostic efficacy of endoscopic ultrasound tomography in pancreatic cancer and cholestasis

Strohm Wd; W. Kurtz; Hagenmüller F; Meinhard Classen


Scandinavian Journal of Gastroenterology | 1984

Detection of biliary stones by means of endosonography.

Strohm Wd; W. Kurtz; Meinhard Classen

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W. Kurtz

Goethe University Frankfurt

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W. D. Strohm

Goethe University Frankfurt

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Dietmar Wurbs

Goethe University Frankfurt

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U. Leuschner

Goethe University Frankfurt

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Ulrich Leuschner

Goethe University Frankfurt

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Jean François Rey

International Agency for Research on Cancer

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F. Hagenmüller

Goethe University Frankfurt

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M. Leuschner

Goethe University Frankfurt

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D. Wurbs

Goethe University Frankfurt

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E. B. Helm

Goethe University Frankfurt

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