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Atrial Transcriptional Profiles of Molecular Targets Mediating Electrophysiological Function in Aging and Pgc-1 β Deficient Murine Hearts
Conclusion: These findings limit the possible roles of gene transcriptional changes in previously reported age-dependent pro-arrhythmic electrophysiologial changes observed in Pgc-1β-/- atria to an altered Ca2+-ATPase (Atp2a2) expression. This directly parallels previously reported arrhythmic mechanism associated with p21-activated kinase type 1 deficiency. This could add to contributions from the direct physiological outcomes of mitochondrial dysfunction, whether through reactive oxygen species (ROS) production or altered Ca2+ homeostasis. Introduction Atrial arrhythmias constitute a major public health pro...
Source: Frontiers in Physiology - April 23, 2019 Category: Physiology Source Type: research

Impending paradoxical embolism: Have we lost the clot?
First demonstrated on echocardiography in 1985, impending paradoxical embolism refers to a thrombus traversing an atrial septal defect, usually a patent foramen ovale (PFO) [1]. Estimates of the prevalence of PFO range from 15% to 35% but impending paradoxical embolism is rare, with fewer than 200 cases reported in the literature [2‐4]. Most cases are associated with pulmonary emboli. Elevated pulmonary and right atrial pressures may push a thrombus through a PFO into the systemic circulation, producing paradoxical systemic embolization. The high risk of cardio‐embolic stroke makes the diagnosis an emergency. Treatment...
Source: The Clinical Respiratory Journal - October 1, 2013 Category: Respiratory Medicine Authors: Finn Ghent, Levi Bassin, Michael Keller, Gregory Cranney, David McKenzie, Peter Grant Tags: Other Source Type: research