Journal ArticleDOI
Cellular Basis for the Electrocardiographic J Wave
Gan-Xin Yan,Charles Antzelevitch +1 more
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TLDR
The results provide the first direct evidence in support of the hypothesis that heterogeneous distribution of a transient outward current-mediated spike-and-dome morphology of the action potential across the ventricular wall underlies the manifestation of the electrocardiographic J wave.Abstract:
Background The J wave is a deflection that appears in the ECG as a late delta wave following the QRS or as a small secondary R wave (R′). Also referred to as an Osborn wave, the J wave has been observed in the ECG of animals and humans for more than four decades, yet the mechanism underlying its manifestation is poorly understood. The present study investigates the cellular basis for the J wave using an isolated arterially perfused preparation consisting of a wedge of canine right or left ventricle. Methods and Results A 12-lead ECG was initially recorded in vivo. After isolation and arterial perfusion of the right or left ventricular wedge, transmembrane action potentials were simultaneously recorded from epicardial, M region, and endocardial transmural sites with three floating microelectrodes. A transmural ECG was recorded concurrently. A J wave was observed at the R-ST junction of the ECG in 17 of 20 adult dogs, usually in leads II, III, aVR, and aVF and the mid to lateral precordial leads. The J wave...read more
Citations
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Cardiac dynamics during daily torpor in the Djungarian hamster (Phodopus sungorus).
TL;DR: The absence of episodes of conduction block, tachyarrhythmia, or other forms of ectopy throughout the torpor cycle demonstrates a remarkable resistance to arrhythmogenesis.
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Supplemental Studies for Cardiovascular Risk Assessment in Safety Pharmacology: A Critical Overview
TL;DR: This critical review aims at discussing the usefulness, relevance, advantages, and limitations of some preclinical in vivo, in vitro, and in silico models, with high predictive values and currently used in supplemental safety studies.
Journal ArticleDOI
Characteristic of the prevalence of J wave in apparently healthy Chinese adults.
Chen Kui,Huang Congxin,Wang Xi,Tang Yanhong,Emmy Okello,Mohamed Salim,Deng Han-hua,Hu Shu-ping +7 more
TL;DR: J wave presentation on the ECG of apparently healthy people is not a rare phenomenon and is more likely to be found in the elderly, in males, and more frequently occurs in the inferior leads than in left and right precordial leads.
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Long-term follow-up of early repolarization pattern in elite athletes.
Ricard Serra-Grima,Maite Doñate,Jesús Álvarez-García,Ana Barradas-Pires,Andreu Ferrero,Lidia Carballeira,Teresa Puig,Enrique Rodríguez,Juan Cinca +8 more
TL;DR: A third of elite athletes presented ERP, and this persisted in 53.4% of cases after retirement, and after a long follow-up period, no difference in outcome of SCD was seen.
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Clinical Management of Ventricular Tachycardia
TL;DR: This review describes the diagnosis, mechanisms, etiology, and management of monomorphic and polymorphic VT, with attention to recent advances in biological understanding and the most current therapeutic recommendations.
References
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Journal ArticleDOI
Right bundle branch block, persistent ST segment elevation and sudden cardiac death: a distinct clinical and electrocardiographic syndrome. A multicenter report.
Pedro Brugada,Josep Brugada +1 more
TL;DR: Common clinical and ECG features define a distinct syndrome in this group of patients with recurrent episodes of aborted sudden death unexplainable by currently known diseases, not explainable by electrolyte disturbances, ischemia or structural heart disease.
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Heterogeneity within the ventricular wall. Electrophysiology and pharmacology of epicardial, endocardial, and M cells.
Charles Antzelevitch,Serge Sicouri,Silvio H. Litovsky,Anton Lukas,S C Krishnan,J. M. Di Diego,G. A. Gintant,Da-Wei Liu +7 more
TL;DR: In spite of important advances in cardiology in recent years, pharmacological control of cardiac arrhythmias in the clinic remains an experiment conducted on a patient-by-patient basis using a trial and error approach tempered by good clinical judgment.
Journal ArticleDOI
Inward current channels activated by intracellular Ca in cultured cardiac cells.
TL;DR: Researchers report here studies on single channel currents recorded from heart muscle cells, in which they have found a channel, abundant in cardiac membrane, which does not seem to belong in any of the familiar categories.
Journal ArticleDOI
Characteristics of the Delayed Rectifier Current (IKr and IKs) in Canine Ventricular Epicardial, Midmyocardial, and Endocardial Myocytes A Weaker IKs Contributes to the Longer Action Potential of the M Cell
Da-Wei Liu,Charles Antzelevitch +1 more
TL;DR: The results suggest that the distinctive phase-3 repolarization features of M cells are due in part to a lesser contribution of IKs and that this distinction may also explain why M Cells are the main targets for agents that prolong APD in ventricular myocardium.
Journal ArticleDOI
Influences of anisotropic tissue structure on reentrant circuits in the epicardial border zone of subacute canine infarcts.
TL;DR: It is proposed that the parallel orientation of the muscle bundles in the epicardial border zone is an important cause of ventricular tachycardia because activation transverse to myocardial fibers is sufficiently slow to permit the occurrence of reentry.
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