1,720,964 research outputs found
Takotsubo Syndrome with Complete Heart Block and Cardiogenic Shock
No full textThis report describes a 62-year-old postmenopausal female patient who presented with cardiogenic shock, wide QRS complete heart block (CHB), left ventricular apical ballooning with severe systolic dysfunction, and normal coronary angiogram. She underwent permanent pacemaker implantation and showed a disappearance of apical dyskinesis and significant improvement in left ventricular function over the next 1 week. CHB was persistent at follow-up. Relevant literature with regard to this unique combination is discussed
Mitral Annulus Disjunction, Annuloaortic Ectasia, and Pseudoaneurysm of Aortomitral Interannular Fibrosa in a 2-Year-Old Child
No full textGenetically determined deficiency of connective tissue predisposes to the prolapsed mitral valve and an abnormal fibrous annulus including mitral annulus disjunction and dehiscence of aortomitral annular fibrosa. In a more severe phenotype, there may be abnormal aortic tissue, leading to annuloaortic ectasia. This report describes a 2-year-old male child who presented with failure to thrive and was found to have Barlow's syndrome with bileaflet mitral valve prolapse and mitral annulus disjunction, annuloaortic ectasia, and a pseudoaneurysm of interannular fibrosa. The case is reported for its interesting unifying linkage among various defects
Combined Right and Left Ventricular Reperfusion Injury Following Percutaneous Coronary Intervention: Role of Myocardial Contrast Echocardiography
No full textRight ventricular myocardial infarction (RVMI) occurs in up to half of the patients of inferior wall myocardial infarction. RVMI results in edema and increased right ventricular (RV) mass, and hence, it should be possible to visualize microvascular obstruction as a manifestation of reperfusion injury. Reperfusion injury of the RV myocardium following primary percutaneous coronary intervention has been rarely reported. This report describes a patient with the left ventricular inferior and RVMI who showed echocardiographically detected reperfusion injury of the RV-free wall and left ventricular basal inferolateral wall and conformed by myocardial contrast perfusion study despite successful percutaneous revascularization of the right coronary artery
Reverse Platypnea–Orthodeoxia with Atrial Septal Defect and Diffuse Pulmonary Arteriovenous Fistulae in Hepatopulmonary Syndrome
No full textA 69-year-old male with a long-standing diagnosis of interstitial lung disease and on domiciliary oxygen therapy was evaluated by echocardiography. His supine oxygen saturation ranged between 77% and 86% and upright oxygen saturation was 93%–94%. Two-dimensional transthoracic echocardiography showed a secundum atrial septal defect of 15 mm diameter with left-to-right shunting but without dilatation of right-sided chambers. Air bubble contrast echocardiography showed no air bubbles crossing the atrial septum but bubbles appeared in left-sided chambers through pulmonary veins after five cardiac cycles indicating intra-pulmonary shunting. Computed tomography of the chest demonstrated a mosaic pattern of the lung parenchyma, characterized by the presence of alternating geographic areas of low attenuation with regions of relatively increased attenuation typical of diffuse pulmonary arteriovenous fistulae. This is a rare case of reverse platypnea-orthodexia with possible contribution of two different pathophysiologic mechanisms but precise mechanism remains elusive
Massive Calcified Intramural Hematoma of the Right Ventricular Free Wall with 31-year Follow-up
No full textA 21-year-old girl presented with an episode of ventricular tachycardia in September 1991. She was found to have a large (8 cm × 5 cm) mass in the right ventricle and was operated. The mass was full of thrombi and fresh blood that was evacuated. She remained asymptomatic till May 2022, when she presented with another episode of ventricular tachycardia. She also had a history of effort angina of 2 months' duration. Multimodality imaging evaluation revealed a large calcific cystic mass in the right ventricular free wall with an unruptured aneurysm of the right sinus of Valsalva, a markedly distorted right ventricular cavity, and the Brugada pattern of electrocardiogram. The case is reported for its rarity, long follow-up, and strikingly high-quality images
Pericardial Patch Aneurysm following Repair of Atrioventricular Septal Defect and Mitral Valve Replacement with 10-Year Follow-Up
No full textA 26-year-old female patient who had surgical closure of the ventricular septal defect with an autologous pericardial patch and mitral valve repair for the cleft mitral valve in early childhood at age 4 and then subsequently mitral valve replacement with a bioprosthetic valve in 2011 at the age of 16 years, was found to have a large cystic mass protruding into the right ventricular inflow on echocardiography during a late routine examination in 2012. The cystic mass identified on echocardiography was shown to be an aneurysmal dilatation of the autologous pericardial patch used for the repair of the ventricular septal defect. As the third corrective surgery would have been inherently complicated with risk to the conduction system, she has been followed conservatively for the last 10 years without any significant complaints except mild dyspnea. This case illustrates that the pericardial patch aneurysm is relatively stable and surgery is rarely indicated unless the aneurysm causes mechanical compression or obstruction of the right ventricular inflow or outflow
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
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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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