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  • 2000-2004  (4)
  • 1985-1989
  • 2000  (4)
  • 1
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Triple therapy, combining a proton pump inhibitor with clarithromycin (C) and either amoxycillin (A) or a nitro-imidazole (I) is the standard in Helicobacter pylori eradication therapy. Recently, triple therapies based on ranitidine bismuth citrate (RBC) have emerged as an alternative. This review examines the current literature for studies directly comparing proton pump inhibitor- with RBC-based triple therapies. Seventeen studies were identified, of which three have been published as a full paper.Eradication rates in an intention-to-treat analysis ranged from 51 to 98%. No large difference in cure rates between the different regimens was demonstrated, although the RBC-I-C combination was somewhat superior. No definite conclusions could be made about the impact of metronidazole or clarithromycin resistance since only three studies performed a formal resistance analysis. No serious side-effects were reported, and dropout rates were equal for the two regimens.Both RBC- and proton pump inhibitor-based triple therapies are highly effective. If one prefers a imidazole/clarithromycin combination the evidence presented here suggests that RBC should be used instead of a proton pump inhibitor. Larger studies comparing both forms of triple therapy, using proper resistance analysis, are needed before final conclusions can be reached regarding efficacy in the setting of bacterial resistance.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In recent years, a series of non-linear optically active bis(benzylidene) ketones have been synthesized and investigated by electron crystallography. In most cases, structure refinement was possible by combining electron diffraction analysis and quantum-mechanical calculations with maximum-entropy methods. However, when the torsional angles between the phenyl rings and the C=C double bonds are strongly affected by the crystal field, this method fails because packing-energy calculations are not sufficiently sensitive. This problem can be solved by refining the approximate model with SHELXL, if the data set is sufficiently accurate and the model close to the correct structure. Here it is shown that a considerably superior data set can be obtained at 300 kV with on-line data acquisition.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Gefässchirurgie 5 (2000), S. 14-19 
    ISSN: 1434-3932
    Keywords: Schlüsselwörter Stentgraft ⋅ TALENT-System ⋅ Aortenaneurysma ; Key words Stent graft ⋅ TALENT device ⋅ Aortic aneurysm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Introduction The TALENT system has made it feasible for the first time to use endovascular stent placement in the treatment of infrarenal aneurysms of the abdominal aorta with neck diameters greater than 26 mm. The following paper presents the experience of 29 German vascular surgical centers using the TALENT system. Materials and Methods Between October 1996 and September 1997, a total of 123 aortic aneurysms in 122 patients were treated endovascularly. Ninety-five infrarenal aneurysms of the abdominal aorta were treated using bifurcated stents, while in 28 cases tube stents were implanted. In nine cases, tube stents were used to treat aneurysm of the thoracic aorta. A total of 111 patients (112 aneurysms) presented for follow-up. The average proximal diameter of the bifurcated stents in infrarenal aneurysms was 30 mm (range 24–36 mm), while the average iliac stent diameter was 14 mm (range: 10–20 mm). In tube stents, diameters ranged from 24–30 mm in abdominal stents and from 32–40 mm in thoracic stents, respectively. In this series, each stent was individually manufactured for the patient on the basis of findings from computed tomography (CT) and calibrated angiography. Results Endovascular treatment of aneurysms was successful technically in 96% of patients. During a follow-up period averaging 4.3 months, the following complications were observed: 5 perioperative death (4.1%), 4 conversions to open surgical therapy (3.3%), 7 endoleaks (5.7%), 2 stent dislocations, 2 iliac stent thromboses, 2 perforations of iliac arteries, 1 inguinal hematoma, and 1 inguinal infection. Conclusions These preliminary findings show that aneurysms with larger neck diameters are amenable to endovascular treatment. Despite the wide distribution of participating vascular surgery centers with varying degrees of experience and many first-time implantations, the results of the present multicenter study hardly differed from those reported in larger series in established institutions. Through the use of larger-diameter stents, up to 50% of all infrarenal aneurysms of the abdominal aorta may be possibly successfully treated using endovascular methods.
    Notes: Zusammenfassung Mit dem TALENT-System war erstmals die Ausschaltung infrarenaler Aneurysmen mit einem Halsdurchmesser größer 26 mm möglich. Es werden zusammengefaßt die Erfahrungen mit dem TALENT-System in 29 deutschen Zentren vorgestellt. Material und Methode: Von Oktober 1996 bis September 1997 wurden insgesamt 123 Aortenaneurysmen bei 122 Patienten endovaskulär behandelt; 95 infrarenale Bauchaortenaneurysmen wurden mittels Y-Stents und 28 mittels Tube-Stents ausgeschaltet. In 9 Fällen wurde ein thorakales Aortenaneurysma mit 〈\d〉 Tube-Stent therapiert. Insgesamt 111 Patienten (112 Aneurysmen) konnten in diesen Nachuntersuchungen erfaßt werden. Der durchschnittliche proximale Stentdurchmesser der Y-Stents bei infrarenalen Aortenaneurysmen betrug 30 (24–36) mm, der iliakale Stentdurchmesser betrug 14 (10–20) mm. Bei Tube-Stents in abdomineller Position betrug der Durchmesser 24–30 mm und bei thorakaler Verwendung 32–40 mm. Jeder Stent in dieser Serie wurde noch individuell für den betreffenden Patienten auf der Grundlage von CT und kalibrierter Angiographie angefertigt. Ergebnisse: Die Aneurysmaausschaltung war in 96% der Patienten technisch erfolgreich durchführbar. In einer mittleren Follow-up-Zeit von 4,3 Monaten traten folgende Komplikationen auf: 5 perioperative Todesfälle (4,1%), 4 Konventionen zur chirurgisch offenen Therapie (3,3%), 7 Endoleaks (5,7%), 2 Stentdislokationen, 2 iliakale Stentthrombosen, 2 Perforationen von Beckenarterien, 1 Leistenhämatom, 1 Leisteninfekt. Schlußfolgerungen: Diese Frühergebnisse zeigen, daß auch Aneurysmen mit größeren Halsdurchmessern endovaskulär gut therapiert werden können. Trotz der großen Streuung der teilnehmenden Zentren mit unterschiedlicher Erfahrung und vielen Erstimplantationen unterscheiden sich die hier erzielten Ergebnisse kaum von größeren Serien etablierter Zentren. Es scheint möglich, durch den Einsatz großlumiger Stents bis zu 50% aller infrarenalen Aortenaneurysmen endovaskulär zu behandeln.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 11 (2000), S. 499-503 
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract In the current study subcutaneous glucose kinetics were investigated in tissue fluid collected with a percutaneous device (PD). PDs containing a subcutaneous tissue chamber were implanted subcutaneously in New Zealand white rabbits. Sintered titanium fiber mesh sheets were used for subcutaneous anchorage of the PD. The bottom of the subcutaneous tissue chamber was either covered with a titanium fiber mesh sheet, a cellulose acetate membrane, or left uncovered. Subcutaneous glucose kinetics were determined after injection of octreotide and glucagon. The tissue reaction to the implants was evaluated histologically. No dynamic relationship was observed between glycaemia and subcutaneous tissue fluid glucose for all membrane covered devices. Histological evaluation showed that the presence of a seroma cavity in combination with obstruction of the membrane prevented adjustment of the subcutaneous glucose concentration in response to changes in glycaemia. In the uncovered devices, on the other hand, changes in glycaemia were reflected in subcutaneous tissue fluid. Our results prove that it is possible to measure changes in the glucose concentration in subcutaneous tissue fluid collected with a percutaneous device. Therefore, we conclude that a percutaneous device has an application as model to study the in vivo performance of implantable glucose sensors. The use of porous membranes in such devices has to be avoided.
    Type of Medium: Electronic Resource
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