124,777 research outputs found
Das infantile Hämangioendotheliom der Leber - sonographische Diagnostik und Verlaufskontrolle
No full textInfantile Hemangioendothelioma of the Liver - Sonographic Diagnosis and Follow-up. Objective: Hepatic haemangioendothelioma is the most frequently observed hepatic tumour of early infancy. Lesions may cause life-threatening disease due to av-shunt-related cardiac failure, Kasabach-Merritt syndrome or encroachment on surrounding tissue. In this paper, the value of ultrasonography at initial work-up as well as during follow-up under various management strategies is discussed. Method: Retrospective analysis of sonographic and clinical data as well as outcome of 14 patients. Results: The tumours may present initially with a typical sonographic pattern of a roundish solitary lesion consisting predominantly of massively perfused, tortuous cavities. In these cases, histological verification of the diagnosis is not mandatory, provided serological tumour markers are negative. Multifocal haemangioendotheliomata with a solid appearance, however, cannot be reliably distinguished from other entities sonographically. Tumour development - with or without therapy - can be followed up precisely using repeated ultrasound evaluations of tumour volume and sono-morphology as well as Doppler examination of tumour perfusion. Conclusions: Guidelines for the management of these patients are discussed, based on our experience and a review of the literature. Sonography proves to be of outstanding importance
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Prenatal diagnosis of an ectopic intrathoracic kidney in right-sided congenital diaphragmatic hernia using color Doppler ultrasonography
No full textThe prenatal sonographic features of a fetus with right-sided congenital diaphragmatic hernia diagnosed at 33 weeks are presented. Color Doppler demonstrated an abnormal course of the right renal artery, arising from the aorta and feeding the intrathoracic right kidney. This case report stresses the role of color Doppler in defining which organs have herniated in fetuses with diaphragmatic hernia
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Development of liver size and perfusion after reduced-size liver transplantation in children
No full textThe technique of segmental liver transplantation (s-LTx) provides a method to overcome the shortage of suitable livers for small recipients. Patient survival rates are parallel to those obtained with whole liver transplantation (w-LTx), For long-term rehabilitation, adaptive liver growth and adequate perfusion is crucial; however, morphometric and hemodynamic parameters in growing children with s-LTx are not available. Seventeen children who received a s-LTx and 25 with a w-LTx who had follow-up evaluation 1 and 2 yr after LTx were studied. Mean age at time of transplantation was 4.3 +/-3.5 yr for s-LTx and 10.3 +/-6.0 yr for w-LTx, mean height 98 +/- 21 cm and 122 +/- 30 cm respectively. At follow-up evaluation mean values for liver enzymes, bilirubin and prothrombin time were in the normal ranges for both groups. Liver dimensions were measured by gray scale ultrasound, and hemodynamic parameters by Doppler sonography in the portal vein and hepatic artery using an Acuson 128 machine. Maximal (V-max), minimal (V-min) and time-average velocity (TAV) were measured and the resistive index (RI) calculated. We found that 1 and 2 yr after LTx liver dimensions were at a mean in the upper normal range of healthy controls. Spleen size was above the normal range and did not show any tendency towards regression. Mean V-max in the hepatic artery in s-LTx and w-LTx was 48 cm/sec vs. 28 cm/sec after 1 yr and 30 cm/sec vs. 35 cm/sec after 2 yr, the RI 0.66 vs. 0.55 and 0.59 vs. 0.73, respectively (p for all parameters >0.05), Maximal portal vein flow was 25 cm/sec in s-LTx vs. 29 cm/sec in w-LTx. Blood flow calculated by vessel diameter and TAV showed no statistical difference between both groups. In conclusion, liver size after s-LTx and w-LTx was increased to the upper normal range, and portal vein blood flow velocities were within the normal range. V-max in the hepatic artery was reduced in s-LTx; however, the reduction was to the same extent as in w-LTx. In the view of long-term functional adaptation, s-LTx is not inferior to w-LTx
Development of liver size and perfusion after reduced-size liver transplantation in children
No full textThe technique of segmental liver transplantation (s-LTx) provides a method to overcome the shortage of suitable livers for small recipients. Patient survival rates are parallel to those obtained with whole liver transplantation (w-LTx), For long-term rehabilitation, adaptive liver growth and adequate perfusion is crucial; however, morphometric and hemodynamic parameters in growing children with s-LTx are not available. Seventeen children who received a s-LTx and 25 with a w-LTx who had follow-up evaluation 1 and 2 yr after LTx were studied. Mean age at time of transplantation was 4.3 +/-3.5 yr for s-LTx and 10.3 +/-6.0 yr for w-LTx, mean height 98 +/- 21 cm and 122 +/- 30 cm respectively. At follow-up evaluation mean values for liver enzymes, bilirubin and prothrombin time were in the normal ranges for both groups. Liver dimensions were measured by gray scale ultrasound, and hemodynamic parameters by Doppler sonography in the portal vein and hepatic artery using an Acuson 128 machine. Maximal (V-max), minimal (V-min) and time-average velocity (TAV) were measured and the resistive index (RI) calculated. We found that 1 and 2 yr after LTx liver dimensions were at a mean in the upper normal range of healthy controls. Spleen size was above the normal range and did not show any tendency towards regression. Mean V-max in the hepatic artery in s-LTx and w-LTx was 48 cm/sec vs. 28 cm/sec after 1 yr and 30 cm/sec vs. 35 cm/sec after 2 yr, the RI 0.66 vs. 0.55 and 0.59 vs. 0.73, respectively (p for all parameters >0.05), Maximal portal vein flow was 25 cm/sec in s-LTx vs. 29 cm/sec in w-LTx. Blood flow calculated by vessel diameter and TAV showed no statistical difference between both groups. In conclusion, liver size after s-LTx and w-LTx was increased to the upper normal range, and portal vein blood flow velocities were within the normal range. V-max in the hepatic artery was reduced in s-LTx; however, the reduction was to the same extent as in w-LTx. In the view of long-term functional adaptation, s-LTx is not inferior to w-LTx
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Dr. Edwin Wright Collection: Author Unknown
No full textNotes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
Increased nuchal translucency as a prenatal manifestation of congenital adrenal hyperplasia
No full textWe present two cases of pregnant women with a previous history of congenital adrenal hyperplasia. In both cases the only abnormal feature in the initial pregnancy had been increased nuchal translucency at 10-14 weeks of gestation. The fetal karyotype was normal and a diagnosis of congenital adrenal hyperplasia was made after delivery. In their current pregnancies, both fetuses also had increased nuchal translucency and normal fetal karyotype. Diagnosis of 21-hydroxylase deficiency was made prenatally by DNA analysis. These findings in four affected fetuses suggest that congenital adrenal hyperplasia should be added to the list of genetic anomalies associated with an increase in nuchal translucency
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
