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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 357-357 
    ISSN: 1432-1084
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1084
    Keywords: Transjugular intrahepatic portosystemic shunt (TIPS) ; Nitinol Strecker stents ; Metallic stent ; Interventional radiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of our study was to evaluate the performance and efficacy of a new self-expanding stent (nitinol Strecker stent) in the transjugular intrahepatic portosystemic shunt (TIPS) procedure. We have successfully placed 64 nitinol Strecker stents in 48 patients. The average portosystemic gradient decreased from 22 to 11 mm Hg. Balloon dilatation was necessary in 12 of 35 angiographically controlled cases at 5 days (34%), because of incomplete stent expansion, small thrombi within the stent or obstruction. At 1–6 months stent malfunctions occurred in 8 of 23 patients who underwent control angiography (34%) and at 6–24 months in 6 of 7 patients (85%). Rebleeding occurred in 2 of 39 patients (follow-up 〉 1 month) (5%) and temporary crises of de novo encephalopathy were observed in 11 of 48 patients (23%). Refractory ascites completely resolved in 4 of 6 patients (66%) and improved in the remaining 2 cases. Compared with other self-expanding stents, nitinol Strecker stents seem to be equally effective in TIPS; no increase in complication rate was observed, either clinical or stent-related.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 7 (1997), S. 1398-1409 
    ISSN: 1432-1084
    Keywords: Key words: CT ; US ; Small bowel neoplasms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Small bowel (SB) neoplasms are very rare tumours, but are still associated with high mortality rates, since the tumour-related symptoms occur late and are non-specific. In addition, endoscopy is not feasible in most cases, and radiological contrast studies do not reach the high accuracy obtained in the evaluation of upper and lower gastrointestinal tract. Cross-sectional imaging, and particularly CT, is becoming increasingly relevant in the diagnosis of these tumours. Both US and CT allow tumour detection, even when performed on an emergency basis, and are capable of showing the lesion as well as possible complications. Moreover, CT offers the possibility of a preoperative staging by evaluating tumour extension through the bowel wall, lymph node involvement and possible metastases. Finally, in most cases a direct correlation between cross-sectional findings and histology can be found, thus permitting tumour characterisation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 9 (1995), S. 29-36 
    ISSN: 1432-2218
    Keywords: Complications ; Bile duct injuries ; Coordinated approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The diagnostic and therapeutic approaches used for patients referred for bile duct injuries and other major complications after laparoscopic cholecystectomy (LC) were reviewed and the results of a coordinated radiologic, endoscopic, and surgical approach were assessed. From April 1991 to October 1993, 23 patients were observed. Seven patients had biliary strictures, five had biliary lesions, five presented with retained common bile duct (CBD) stones, and one had a minor cystic duct leak. Five patients had miscellaneous abdominal fluid collections; in addition, biloma or bile ascites were present in 10/23 cases. Correct definition of iatrogenic lesions was mainly made by endoscopic retrograde cholangiography (ERCP) (n=15), associated in six cases also with percutaneous cholangiography (PTC). “Minimally invasive” treatment included the full range of endoscopic and interventional radiological procedures. Six patients with biliary strictures, one patient with a biliary lesion, all five patients with residual CBD stones, and four patients with abdominal collections were treated by “minimally invasive” techniques: Therefore, laparotomy was avoided in 70% of cases (16/23 patients). Open surgery was necessary in 7/23 patients (30%), because of ductal lesion (n=4), ductal stricture by endoloop (n=1), iliac artery injury (n=1), and phlegmon of gallbladder bed (n=1). It appears that careful assessment of complications after LC is mandatory and often requires the combined use of ERCP/PTC and cross-sectional imaging. After a first diagnostic phase, complications should be managed by a multidisciplinary approach wherein the radiologist and the endoscopist strictly cooperate with the surgeon in order to obtain an immediate relief of the initial clinical problem, such as jaundice, bile leak, or infection, and then plan a definitive treatment which is tailored to each patient's problem. Using this approach the whole event of LC and its complications can be managed within the field of minimally invasive therapy in most cases.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-2568
    Keywords: transjugular intrahepatic portosystemic shunt ; hepatic encephalopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Forty-seven consecutive patients were prospectively evaluated to study the incidence of hepatic encephalopathy as well as modifications in the PSE index after TIPS. Various clinical, laboratory, and angiographic parameters were also recorded to identify risk factors for the development of post-TIPS hepatic encephalopathy (HE). Mean follow-up was 17±7 months. During follow-up, six patients died and one underwent transplantation. All other patients were followed for at least a year. Fifteen patients (32%) experienced 20 acute episodes of precipitated HE (hospitalization was necessary in 10 instances), and five patients (11%) presented a continuous alteration in mental status with frequent spontaneous exacerbation during follow-up. Both precipitated and spontaneous HE occurred more frequently during the first three months of follow-up. Moreover the PSE index was significantly worse than basal values one month after TIPS, thereafter returning to near basal values. HE was successfully treated in all patients but one who required a reduction in the stent/shunt diameter. Increasing age (〉65 years) and low portacaval gradient (〈10 mm Hg) were predictors of HE after TIPS. A gradual dilation of the stent/shunt should be performed to obtain a portacaval gradient 〉10 mm Hg to avoid an unacceptable rate of HE after TIPS.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of biological physics 25 (1999), S. 279-288 
    ISSN: 1573-0689
    Keywords: competition ; fitness ; multicellular bacteria ; pattern formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract We present a simple model based on a reaction-diffusion equation to explain pattern formation in a multicellular bacterium (Streptomyces). We assume competition for resources as the basic mechanism that leads to pattern formation; in particular we are able to reproduce the spatial pattern formed by bacterial aerial mycelium in the case of growth in minimal (low resources) and maximal (large resources) culture media.
    Type of Medium: Electronic Resource
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