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Unusual complication after aortic valve replacement with the Freedom Solo stentless bioprosthesis.
No full text
Hemolytic anemia 19 years after mitral valve replacement with a porcine bioprosthesis
Full text linkA 58-year-old man required replacement of a porcine mitral
prosthesis because of severe hemolysis 19 years after implant.
At operation the major pathologic finding was a perforation of one
cusp with calcific deposition limited to the commissures. Clinically
evident hemolytic anemia due to porcine valve dysfunction is
rare particularly occurring very late postoperatively due to cusp
perforation as in the present case
Huge aortic pseudoaneurysm due to detachment of both coronary buttons after the modified Bentall procedure
Full text linkA 59-year-old female presented with a huge aortic preudoaneurysm (maximum diameter of 9 cm) 12 years following a modified Bentall procedure with a 23mm mechanical conduit (Figures 1,2). At reoperation the pseudoaneurysm was found to be due to complete dehiscence of both coronary ostial anastomoses, compressing the right cardiac sections
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Single center experience with the Sorin Bicarbon prosthesis. A 17-year follow-up
No full textObjective: To evaluate the long-term results of aortic valve replacement (AVR) and mitral valve replacement
(MVR) with the Sorin Bicarbon prosthesis (SBP).
Methods: Five hundred seven patients (306 men, 201 women), mean age 62 10 years (range, 21-86 years),
received an SBP between 1994 and 2000; AVR was performed in 344 (67%) and MVR in 163 (33%). The main
concomitant procedure was coronary artery grafting in 79 patients (16%). Follow-up was 99%complete; mean
follow-up was 12.7 4.0 years with a cumulative duration of follow-up of 6475 patient-years in the entire group
(4348 patient-years for AVR and 2124 patient-years for MVR).
Results: Hospital mortality was 2.7% (AVR, 2.03%; MVR, 4.3%). There were 169 late deaths (AVR, 128;
MVR, 41). Actuarial survival at 17 years is 49.7% 5.3% for AVR and 62.0% 6.1% for MVR. At the
last follow-up, 310 survivors (199 AVR, 111 MVR) are in New York Heart Association functional class I or
II. At 17 years, actuarial freedom from valve-related deaths, embolism, and bleeding is 89.8% 4.8%,
85.8% 5.4%, and 96.2% 1.2% after AVR, and 91.9% 3.9%, 96.3% 1.8%, 95.0% 2.9% after
MVR. Reoperation was required in 5 patients with AVR (thrombosis in 4 and perivalvular leak in 1). Actuarial
freedom from reoperation is 98.1% 0.8% after AVR and 100% after MVR; freedom from endocarditis is
100% after AVR and 99.2% 0.7% after MVR. No cases of intrinsic structural valve failure were observed.
Conclusions: The SBP has shown excellent results in terms of clinical improvement and freedom from
valve-related complications, even up to 17 years after AVR and MVR. It therefore seems to be a safe option
whenever a mechanical prosthesis is needed. (J Thorac Cardiovasc Surg 2014;148:2039-44
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
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