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Structural alteration of erythrocyte cell membrane in the presence of artificial prostheses: a radiowave dielectric spectroscopic study
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Plastic biliary stent occlusion: Factors involved and possible preventive approaches
No full textEndoscopic biliary stenting is today the most common palliative treatment for patients suffering from obstructive jaundice associated with malignant hepatobiliary tumors or benign strictures. However, recurrent jaundice, with or without cholangitis, is a major complication of a biliary endoprosthesis insertion.Thus, stent removal and replacement with a new one frequently occurs as a consequence of device blockage caused by microbial biofilm growth and biliary sludge accumulation in the lumen. Factors and mechanisms involved in plastic stent clogging arising from epidemiological, clinical and experimental data, as well as the possible strategies to prevent biliary stent failure, will be reviewed and discussed. ©2007 Marshfield Clinic
Presenza dell'Antigene Tumorale GastroIntestinale (GICA 19-9) nel siero e nella saliva dei pazienti con carcinoma del colon-retto . Studio Multicentrico
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Clinical value of CA 19-9 (carbohydrate antigen) in gastrointestinal adenocarcinoma.
No full textCA 19-9 and CEA serum levels were determined before and 7 days after surgery in 140 patients with gastrointestinal adenocarcinoma, and in 70 patients with gastrointestinal non neoplastic diseases. CA 19-9 test was shown to be positive in 37.9% of colorectal cancer, in 32.6% of gastric cancer and in 77.8% of pancreatic cancer. CA 19-9 test was also shown to be more sensitive for colonic cancer with respect to rectal cancer (40.9% vs. 23.5%). CA 19-9 test is more sensitive and specific than CEA. In particular, the reported results suggest the clinical value of CA 19-9 test in the diagnosis of pancreatic adenocarcinoma and as a suitable parameter in the follow-up of gastrointestinal cancer
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Are aortic endograft prostheses fully hemo-compatible? A dielectric spectroscopy investigation of the electrical alterations induced on erythrocyte cell membranes
No full textIn this paper we present a new approach directed to ascertain the full hemo-compatibility of aortic endograft prostheses based on the measurement of the passive electrical parameters of the erythrocyte cell membrane. The red blood cell membrane, from an electric point of view, is characterized by an electrical permittivity, is an element of(s), which takes into account the structural charged organization of the lipid double layer, and by the electrical conductivity, ss, which accounts for the ionic transport processes across the membrane. These parameters can be easily measured by means of a radiowave dielectric spectroscopy technique, analyzing the dependence of the electrical impedance of an erythrocyte suspension on the frequency of the applied electric field. In this preliminary report, we investigate the alterations induced, at a membrane level, by two different devices commonly employed for endovascular abdominal aortic aneurysm exclusion, i.e., Excluder((R)) and Zenith((R)) devices, implanted in ten patients. We observe, in all the cases investigated, a statistically significant increase of both the permittivity is an element of(s) and electrical conductivity sigma(s) of the erythrocyte membrane upon the prosthesis implant, this increase being higher than about 20% of the un-treated values. Moreover, these alterations remain roughly unaffected 30 days after surgery. These findings suggest that a complete hemo-compatibility of these prostheses is lacking, even if the observed alterations may not have a clinical relevance
Salvio, F. Giacovazzo, A. Cicalese, G. Dalsasso, E. Zarba Meli, D. Lomanto, S. Toccaceli, A. Basoli, V. Speranza “Manometry in rectum and anus diseases”. The Ital. Journ. of Gastr., Vol. 27, 1995.
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