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  • 1995-1999  (2)
  • Key words: Ruptured abdominal aortic aneurysm — Ischemic colitis — Flexible sigmoidoscopy  (1)
  • fuzzy  (1)
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Material
Years
  • 1995-1999  (2)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Flexible sigmoidoscopy (1997)
    Springer
    Surgical endoscopy and other interventional techniques 11 (1997), S. 113 -115 
    Details
    ISSN: 1432-2218
    Keywords: Key words: Ruptured abdominal aortic aneurysm — Ischemic colitis — Flexible sigmoidoscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: The development of colonic ischemia following repair of ruptured abdominal aortic aneurysm (AAA) is associated with significant morbidity and timely diagnosis is essential. The purpose of this study was to determine the efficacy of endoscopy in the diagnosis of colonic ischemia and in prediction of need for resection. Methods: Patients who underwent postoperative lower endoscopy after ruptured AAA from 1986 to 1995 were reviewed for endoscopic findings, clinical course, and patient outcome. Results: A total of 80 patients had ruptured AAA during the study period, of which 56 survived for longer than 24 h postoperatively. Flexible lower endoscopy was done in 18 patients (32%) on an average of 4.4 days following AAA repair (range 1–16). Indications for initial endoscopy included early or bloody stools in 12 (67%), hemodynamic instability or sepsis in eight (44%), and acidosis in four (22%). The extent of the examination was sigmoid or descending colon in 13, cecum in four, and transverse colon in one. Endoscopic findings were normal in four patients. Five examinations showed only areas of hemorrhagic mucosa. Absence of full-thickness ischemia was confirmed by clinical course or autopsy in these nine patients. Two examinations demonstrated full-thickness necrosis which was confirmed at subsequent laparotomy. In six examinations, ischemia was noted but judged to be limited to mucosa only. Absence of full-thickness disease was demonstrated by laparotomy in three and subsequent course in three. Eight patients (57%) with initial abnormal examinations underwent repeat endoscopy showing improved interval appearance in seven cases and progression to full-thickness ischemia in one patient. Conclusions: Flexible sigmoidoscopy reliably predicts full-thickness colonic ischemia following repair of ruptured aortic aneurysms. Patients with non-confluent ischemia limited to the mucosa can be safely followed by serial endoscopic examinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004649900309
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Geostatistical regionalization of glacial aquitard thickness in northwestern Germany, based on fuzzy kriging (1996)
    Springer
    Mathematical geology 28 (1996), S. 437-452 
    Details
    ISSN: 1573-8868
    Keywords: geostatistics ; regionalization ; fuzzy ; kriging ; hydrogeology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract In many instances hydrogeological parameters obtained by conventional methods for selected localities within an aquifer or an aquitard are not sufficient for adequate regionalization at the scale of the entire layer. Here, we demonstrate an application of the fuzzy kriging method in regionalization of hydrogeological data, in which the set of conventional, crisp values is supplemented by imprecise information subjectively estimated by an expert. It is believed that such an approach eventually may reflect the real-world conditions more closely than a traditional crisp-value approach, because the former does not impose exactness artificially on phenomena which are diffuse by their nature. Spatial interpolation was done for the thickness of one of the major aquitards (till and glaciolacustrine clay) in northwestern Germany. The dataset consists of 329 crisp values from boreholes supplemented by 172 imprecise values defined as fuzzy numbers. It is demonstrated that the reliability of regionalization was higher, compared to regionalization performed with the crisp dataset only. Fuzzy kriging was performed with FUZZEKS (Fuzzy Evaluation and Kriging System) developed at the Ecosystem Research Center at the University of Kiel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02083655
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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