Circulation. Arrhythmia and electrophysiology
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Circ Arrhythm Electrophysiol · Apr 2013
Comparative StudyEffects of iatrogenic myocardial injury on coronary microvascular function in patients undergoing radiofrequency catheter ablation of atrial fibrillation.
Iatrogenic myocardial injury by radiofrequency catheter ablation (RFCA) releases proinflammatory substances from damaged myocardium, and these may contribute to endothelial dysfunction in systemic vascular structure. The aim of this study is to evaluate the effect of nonischemic myocardial damage on coronary microvascular function in patients undergoing atrial fibrillation (AF) ablation. ⋯ URL: http://cris.cdc.go.kr. Unique identifier: KCT0000030.
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Circ Arrhythm Electrophysiol · Feb 2013
A novel criterion for conduction block after catheter ablation of right atrial tachycardia after mitral valve surgery.
One operative approach to the mitral valve, the superior transseptal incision, is proarrhythmic because of extensive atriotomies. The objective of this study is to describe complex atrial tachycardias (ATs) that occur after this approach and propose methods to verify lines of block as an end point for catheter ablation. ⋯ The optimal end point for ablating ATs after mitral valve surgery with the superior transseptal approach is to establish lines of block that can be recognized by characteristic patterns of activation in the lateral RA. A novel criterion for lateral conduction block after catheter ablation is identification of a late-activated corridor in the anterolateral RA.
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Circ Arrhythm Electrophysiol · Feb 2013
Comparative StudyEarly risk of mortality after coronary artery revascularization in patients with left ventricular dysfunction and potential role of the wearable cardioverter defibrillator.
Implantation of implantable cardioverter defibrillator for prevention of sudden cardiac death is deferred for 90 days after coronary revascularization, but mortality may be highest early after cardiac procedures in patients with ventricular dysfunction. We determined mortality risk in postrevascularization patients with left ventricular ejection fraction ≤35% and compared survival with those discharged with a wearable cardioverter defibrillator (WCD). ⋯ Patients with left ventricular ejection fraction ≤35% have higher early compared to late mortality after coronary revascularization, particularly after PCI. As early hazard seemed less marked in WCD users, prospective studies in this high-risk population are indicated to confirm whether WCD use as a bridge to left ventricular ejection fraction improvement or implantable cardioverter defibrillator implantation can improve outcomes after coronary revascularization.