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  • Polymer and Materials Science  (1)
  • Schlüsselwörter Aortofemorale Gefäßprothese  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Urologe 35 (1996), S. 472-477 
    ISSN: 1433-0563
    Keywords: Schlüsselwörter Aortofemorale Gefäßprothese ; Harnleiterläsion ; Harnleiterobstruktion ; Diagnostik ; Therapie ; Key words Aorto-femoral graft ; Ureteral lesion ; Ureteral obstruction ; Diagnosis ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary After implantation of aorto-femoral grafts, primary ureteral lesions and secondary ureteral obstructions are the most important urological complications. Surgical repair carried out as quickly as possible, including reanastomosis without tension and covering with a peritoneal patch or omentum interposition, seems the best means of preventing secondary complications. In the case of secondary obstructions, the interval between implantation of the graft and the diagnosis of obstruction has to be considered. A wait-and-see strategy is justified in the case of early obstruction without symptoms during the 1st year because of the high rate of spontaneous remission. Obstructions that appear more than 1 year after operation or symptomatic obstructions have to be treated immediately (i. e. duodenojejunal stent, percutaneous nephrostomy). If repeated obstructions after removal of stents or nephrostomies are noted, surgical repair seems to be indicated. Stents or nephrostomies as definitive procedures are appropriate only in patients in whom surgical revision is not possible or desirable.
    Notes: Zusammenfassung Nach Implantation aortofemoraler Gefäßprothesen sind die primäre Harnleiterläsion und die sekundäre Obstruktion als wesentlichste Komplikationen dieses Eingriffs anzusehen. Die optimale Versorgung der Harnleiterverletzung beruht auf der schnellstmöglichen operativen Revision mit spannungsfreier Reanastomosierung sowie Deckung der Anastomose mit einem Peritonealpatch oder Omentuminterponat gegen die Gefäßprothese. Bei der sekundären Obstruktion ist das Intervall zwischen Prothesenimplantation und nachgewiesener Obstruktion zu beachten. Bei Frühobstruktion (〈 1 Jahr) ist aufgrund der hohen Spontanremissionsrate bei fehlender Symptomatik eine abwartende Haltung gerechtfertigt. Bei später auftretenden Stauungen und jeder symptomatischen Obstruktion ist dagegen zunächst die Harnableitung zu sichern (DJ-Stent, perkutane Nephrostomie). Kommt es nach einem Auslaßversuch zu einer erneuten Stauung, sollte eine operative Revision angestrebt werden. Eine interne Ableitung als Dauerlösung wäre lediglich bei Patienten zu erwägen, die für eine operative Korrektur nicht in Frage kommen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2137-2146 
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of ferrocene-containing polymeric azines and polymeric Schiff bases have been synthesized by means of acid-catalyzed solution polycondensations. The molecular structures of the polymers synthesized have been determined, and information concerning their thermal behavior has been obtained. Comparative thermal stabilities of the products of polymerization of aliphatic and aromatic diamines with 1,1′-diformylferrocene and 1,1′-diacetylferrocene were investigated by thermogravimetric analysis both in air and in an inert atmosphere. In the inert atmosphere, initial weight loss due to thermal stress did not occur below 300°C in all cases, and in many cases 50-70% residue of polymer sample remained at 700°C. The use of a fluorinated diamine led to the synthesis of a polymer which did not exhibit any significant enhancement of thermal properties. Investigation of the polymer products by direct inlet mass spectroscopy led to the observation that several of the systems contained significant amounts of cyclic dimers, although linear polymers were the major products in most cases. Extraction of the cyclic dimers followed by molecular weight determination by vapor phase osmometry confirmed their molecular structures.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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