Marc William Deyell

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BACKGROUND Atrial fibrillation (AF) recurrence after pulmonary vein isolation (PVI) is associated with PV to left atrium reconduction. Effective lesion creation necessitates adequate contact force between the ablation catheter and myocardium. OBJECTIVE The purpose of this study was to study the utility of contact force-guided ablation on immediate and(More)
Arrhythmic sudden cardiac death (SCD) may be caused by ventricular tachycardia/fibrillation or pulseless electric activity/asystole. Effective risk stratification to identify patients at risk of arrhythmic SCD is essential for targeting our healthcare and research resources to tackle this important public health issue. Although our understanding of SCD(More)
Ablation for atrial flutter and continued pharmacologic therapy (hybrid therapy) is a management strategy when treatment with class I antiarrhythmic drugs organize atrial fibrillation (AF) into flutter. Previous studies with 2–3-year follow-up have reported satisfactory control of AF burden. We evaluated the effectiveness of hybrid therapy after a follow-up(More)
BACKGROUND Frequent ventricular premature depolarizations (VPDs) can cause reversible left ventricular (LV) dysfunction. However, not all patients normalize their LV function after VPD elimination. OBJECTIVE To evaluate predictors of recovery of LV function following the elimination of frequent VPDs. METHODS We identified patients with ≥10% VPDs/24 h(More)
BACKGROUND The Occluded Artery Trial (OAT) was a large, randomized controlled trial published in 2006 that demonstrated no benefit to routine percutaneous coronary intervention (PCI) of persistently totally occluded infarct-related arteries (IRA) identified a minimum of 24 hours (on calendar days 3-28) after myocardial infarction (MI). The purpose of this(More)
The case of a 31-year-old man from Alberta diagnosed with Q fever endocarditis is presented. To the authors' knowledge, this is the first case of Q fever endocarditis diagnosed in the province of Alberta. The patient had undergone open valvulotomy for congenital aortic stenosis as an infant. He presented with congestive heart failure secondary to severe(More)
BACKGROUND Frequent ventricular premature depolarizations (VPDs) can cause cardiomyopathy (CMP). The mechanisms underlying its development remain unclear, with VPD burden being only a weak predictor of risk. OBJECTIVE To determine whether VPD QRS duration at the time of initial presentation could predict risk for the subsequent development of CMP in(More)
AIMS The dynamic time course of entrance and exit block during pulmonary vein isolation (PVI) is unknown. The purpose of this series was to dynamically evaluate the manifestation of entrance and exit conduction block during simultaneous circumferential PVI. METHODS AND RESULTS Pacing manoeuvres were performed during cryoballoon ablation of left-sided(More)
Unexplained cardiac arrest is defined as a cardiac arrest in the absence of coronary artery disease and overt structural heart disease, present in 5%-10% of cardiac arrest survivors. A genetic contribution to cardiac arrest is more common in this population, most commonly attributed to an inherited ion channel abnormality leading to familial syncope and(More)