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Pulse-wave Doppler interrogation of the abdominal aorta: A window to the left heart and vasculature
No full textIntermittent Malfunction of a Prosthetic Valve—A Diagnostic Challenge
No full textIntermittent malfunction of a mechanical valve prosthesis is a rare condition that carries serious clinical implications. It results from the periodic entrapment of a prosthetic disk in either an open or closed position leading to transient intravalvular regurgitation or obstruction to flow. The intermittent nature of the malfunction poses a diagnostic challenge, particularly in the era of digital echocardiography. In this manuscript, we describe the Doppler and two-dimensional echocardiographic findings in a patient with intermittent prosthetic mitral valve malfunction.Intermittent malfunction of a mechanical valve prosthesis is a rare condition that carries serious clinical implications. It results from the periodic entrapment of a prosthetic disk in either an open or closed position leading to transient intravalvular regurgitation or obstruction to flow. The intermittent nature of the malfunction poses a diagnostic challenge, particularly in the era of digital echocardiography. In this manuscript, we describe the Doppler and two-dimensional echocardiographic findings in a patient with intermittent prosthetic mitral valve malfunction
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
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