2,172 research outputs found
Arrhythmias Originating in the Atria
No full textAtrial flutter, atrial tachycardias, and atrial fibrillation are the main sustained atrial tachycardias. Reentry, increased automaticity, and triggered activity are atrial arrhythmia's main mechanisms. Atrial flutter is the clinical and theoretical model of reentry. Its classification is based on the atrial chamber involved and the arrhythmia's anatomic path. Ablative procedures for atrial fibrillation have created several new reentrant tachycardias. Electrocardiography (ECG) identifies the site of origin of focal atrial tachycardias and the mechanism of these arrhythmias. ECG is fundamental in the diagnosis of atrial fibrillation and often allows understanding of its mechanism of origin and maintenance
Advanced Concepts of Atrioventricular Nodal Electrophysiology: Observations on the Mechanisms of Atrioventricular Nodal Reciprocating Tachycardias
No full textAtrioventricular node reentrant tachycardia (AVNRT) is a supraventricular arrhythmia easily diagnosed by 12-lead electrocardiogram. What is far more challenging, is the understanding of the reentrant circuit in its typical and atypical presentations. The function of the atrioventricular node is still incomplete and this knowledge gap is reflected in the reconstruction of the pathways used by AVNRT in its multiform presentations. This article illustrates the heterogeneous electrocardiographic manifestations of AVNRT. We reconstruct the reentrant circuits involved using more recent understanding of the anatomic and electrophysiologic characteristics of the atrioventricular node
Intraventricular Delay and Blocks
No full textFrom the atrioventricular node, electrical activation is propagated to both ventricles by a system of specialized conducting fibers, His Purkinje System (HPS), guaranteeing a fast, synchronous depolarization of both ventricles. From the predivisional common stem, a right and left branch separate, subdividing further in a fairly predictable fashion. Synchronous ventricular activation results in a QRS with specific characteristics and duration of less than 110 milliseconds. Block or delay in any part of the HPS changes the electrocardiographic (ECG) morphology. This article discusses the use and limitations of standard ECG in detecting abnormal ventricular propagation in specific areas of the HPS
The Poem of Memory. "Triumphi"
No full textWriting of the "Triumphi" Fabio Finotti finds that its author undercuts a medieval idea of ascent to God in the structural progression from Love to Chastity, Death, Fame, Time, and Eternity. Here Petrarch programmatically counters Dante, transforming a universal, eschatological vision into a subjective, cultural and psychological experience
Fabio Tronchetti
No full textFabio Tronchetti is an Associate Professor of Law at the School of Law of the Harbin Institute of Technology, People’s Republic of China, where he also serves as Director of the International Law Department. Since January 2014 he works as an Adjunct Professor of Comparative National Space Law at the the School of Law of the University of Mississippi, United States. Earlier in his career he was Lecturer and Academic Coordinator at the International Institute of Air and Space Law, Leiden University, the Netherlands.
Professor Tronchetti is regularly invited to give lectures at several European and Chinese Universities, including the Cologne University (Germany), the Leiden University (the Netherlands) and the Beihang University (Beijing, China) and has participated as a speaker at numerous international conferences.
Prof. Tronchetti’s scholarly is primarily in the areas of international space law and public international law. His publications include two books and more than 20 articles in internationally peer-reviewed space law and policy journals, such as Space Policy, the German Journal of Air and Space Law, the Journal of Space Law, etc.
He holds a PhD in International Space Law (Leiden University) and an Advanced LL.M in International Relations (Bologna University, Italy). He is Member of the International Institute of Space Law (IISL), European Centre for Space Law (ECSL), and the Asian Society of International Law (ASIL). He is the recipient of the 2007 Diederiks-Verschoor award for the best paper submitted by an author not older than 40 years to the International Institute of Space Law (IISL) during the 58th International Astronautical Congress of the International Astronautical Federation (IAF).https://commons.erau.edu/stm-images/1076/thumbnail.jp
Per un ritratto di André Tosel
No full textIn memory of André Tosel, who passed away last March 14th in his hometown Nice, «Gramsciana» publishes an article on Gramsci in France that he had sent to this journal as a contribution to the section «My Gramsci». The editor, Fabio Frosini, prefaces the text with a quick portrait of Tosel as a philosophy professor, an influential Marxist intellectual, a critic of contemporary capitalism, as well as the author of landmark books on Spinoza, Kant and Marx and, above all, one of the most important Gramsci scholars of the last 50 years
Sick Sinus Syndrome
No full textThe sick sinus syndrome includes symptoms and signs related to sinus node dysfunction. This can be caused by intrinsic abnormal impulse formation and/or propagation from the sinus node or, in some cases, by extrinsic reversible causes. Careful evaluation of symptoms and of the electrocardiogram is of crucial importance, because diagnosis is mainly based on these 2 elements. In some cases, the pathophysiologic mechanism that induces sinus node dysfunction also favors the onset of atrial arrhythmias, which results in a more complex clinical condition, known as “bradycardia-tachycardia syndrome.
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