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  • 1
    Electronic Resource
    Electronic Resource
    Ischemic Attacks and Patent Foramen Ovale: Transcatheter Closure of Patent Foramen Ovale in Adults with Cryptogenic Systemic Embolism (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 12 (1999), S. 0 
    Details
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In the presence of a patent foramen ovale with otherwise unexplained (cryptogenic) cerebral embolism, the usual therapy is oral anticoagulation or antiplatelet therapy. Surgery is considered only in cases of recurrence. Percutaneous transcatheter occlusion of the patent foramen ovale (PFO) is a new valuable alternative. This article presents the current knowledge and our data concerning nonsurgical closure of patent foramen ovale to prevent paradoxical arterial embolism. Transcatheter PFO closure represents an elegant therapeutic approach in patients with suspected paradoxical embolism because it avoids open heart surgery and is minimally invasive. Even if the recurrence rate of embolism were identical, transcatheter closure would be preferable to anticoagulation because the annual risk of bleeding complications of 2%-3% and the long-term costs of anticoagulation can be avoided. Randomized studies are needed to compare transcatheter closure of patent foramen ovale with anticoagulation, platelet inhibitors, or surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8183.1999.tb00210.x
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  • 2
    Electronic Resource
    Electronic Resource
    Interventional Closure with Amplatzer PFO Occluder of Patent Foramen Ovale in Patients with Paradoxical Cerebral Embolism (2005)
    350 Main Street , Malden , MA 02148-5020 , USA , and P.O. Box 1354, Garsington Road , Oxford OX4 2DQ , UK . : Blackwell Science Inc
    Journal of interventional cardiology 18 (2005), S. 0 
    Details
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Percutaneous transcatheter closure has been proposed as an alternative to surgical closure or long-term anticoagulation in patients with presumed paradoxical embolism and patent foramen ovale (PFO). We report our mid-term results of 55 consecutive symptomatic patients (mean age: 47 years, range: 20–79) who underwent percutaneous transcatheter closure of PFO after at least one event of cerebral ischemia; 16 (29%) patients had at least one transient ischemic attack and 39 (71%) patients at least one embolic stroke. Multiple embolic events had occurred in 6 (11%) patients. Percutaneous transcatheter closure was technically successful in all 55 patients (100%). For the majority of patients, an Amplatzer PFO occluder measuring 25 mm in diameter (n = 49) or an Amplatzer PFO occluder measuring 35 mm in diameter (n = 6) was used. Complete occlusion by color Doppler and transesophageal contrast echocardiography investigation was achieved in 96% at follow-up 3-6 months after implantation; only 2 patients had a trivial residual shunt at follow-up. Mean fluoroscopy time was 6.7 minutes (range: 1.7–47.1), and in-hospital follow-up was uneventful except for 1 patient who developed a cardiac tamponade requiring uneventful and successful needle pericardiocentesis. At a mean follow-up of 19 months (range: 3–32) no recurrent embolic neurological events was observed. Transcatheter closure of PFO with Amplatzer PFO occluder devices is a safe and effective therapy for patients with previous paradoxical embolism and aneurysmatic or nonaneurysmatic PFO. Percutaneous closure is associated with a high success rate, low incidence of hospital complications, and freedom of cerebral ischemia events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8183.2005.04050.x
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  • 3
    Electronic Resource
    Electronic Resource
    Duodenal tuberculosis: A review of the clinicopathologic features and management of twelve cases (1990)
    Springer
    Surgery today 20 (1990), S. 526-529 
    Details
    ISSN: 1436-2813
    Keywords: duodenum ; tuberculosis ; obstruction ; perforation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A retrospective analysis of twelve cases of duodenal tuberculosis is presented herein. The average age of the patients was 31.4 years with a male to female ratio of 2:1. The presenting complaints were duodenal obstruction in six patients and subacute intestinal obstruction in three. None of the patients had associated pulmonary tuberculosis. Eight patients had isolated duodenal tuberculosis, two of whom were successfully treated with antitubercular drugs. In four patients, the diagnosis was established at laparotomy by the presence of tubercles over the duodenum. Five patients required a bypass procedure for obstruction caused by the duodenal tuberculosis and one patient was operated on for uncontrollable bleeding from a tubercular duodenal ulcer. All patients remained symptom free after treatment, whether medical or surgical. Thus, in areas where tuberculosis is endemic, even in the absence of pulmonary tuberculosis, duodenal tuberculosis should be suspected in patients with upper gastrointestinal obstruction or in patients with peptic ulcer like symptoms not responding to medical therapy
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471008
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  • 4
    Electronic Resource
    Electronic Resource
    Polymerisation by the chromate/arsenite system (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 141 (1971), S. 43-53 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die durch ein Chromat/Arsenit-System initiierte Polymerisation von Methylmethacrylat in wäßrigem Medium untersucht. Dabei wurde beobachtet, daß die Polymerisation mit diesem Redoxsystem durch OH⊖ katalysiert wird, obwohl die entsprechende Reaktion zwischen Chromat und Arsenit durch H⊕ katalysiert wird. Auch wurde festgestellt, daß Spuren von Cu2⊕ sowohl die Redoxreaktion als auch die Polymerisation stark hemmen.Es wird 1. geschlossen, daß in alkalischer Lösung mittlere Oxydationsstufen des Chroms nicht initiieren und 2., daß die Redoxreaktion zwischen dem Chromat und dem Arsenit eine Kettenreaktion mit Einelektronenübertragung ist; das dabei entstehende Zwischenprodukt As4⊕ ist der eigentliche Initiator.
    Notes: The aqueous polymerisation of methyl methacrylate initiated by the chromate/arsenite system has been studied. It is observed that the polymerisation by the above redox system is catalysed by OH⊖ though the parent reaction between chromate and arsenite is catalysed by H⊕. It is also observed that traces of Cu2⊕ inhibit both the polymerization reaction as also the parent reaction.From these observations it is concluded (1) intermediate valency states of chromium has no initiating power in alkali solution and (2) the redox reaction between chromate and arsenite is a chain reaction involving single electron transfer and the intermediate As4⊕ thus produced is the initiating species.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021410105
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