Gilles O’Hara

ORCID: 0000-0002-1115-8108
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About
Contact & Profiles
Research Areas
  • Cardiac Arrhythmias and Treatments
  • Atrial Fibrillation Management and Outcomes
  • Cardiac electrophysiology and arrhythmias
  • Cardiac pacing and defibrillation studies
  • Cardiac Structural Anomalies and Repair
  • Cardiac tumors and thrombi
  • Cardiac Imaging and Diagnostics
  • Cardiac Valve Diseases and Treatments
  • Antiplatelet Therapy and Cardiovascular Diseases
  • ECG Monitoring and Analysis
  • Cardiovascular Syncope and Autonomic Disorders
  • Pharmacogenetics and Drug Metabolism
  • Infective Endocarditis Diagnosis and Management
  • Venous Thromboembolism Diagnosis and Management
  • Ion channel regulation and function
  • Cardiac, Anesthesia and Surgical Outcomes
  • Lipoproteins and Cardiovascular Health
  • Cardiomyopathy and Myosin Studies
  • Contact Dermatitis and Allergies
  • Health Systems, Economic Evaluations, Quality of Life
  • Neurological disorders and treatments
  • Antimicrobial Resistance in Staphylococcus
  • Vascular anomalies and interventions
  • Social Work Education and Practice
  • Heart Rate Variability and Autonomic Control

Université Laval
2016-2025

Institut Universitaire de Cardiologie et de Pneumologie de Québec
2015-2024

Royal Ottawa Mental Health Centre
2024

Montreal Heart Institute
2007-2023

Laboratoire Lorrain de Recherche en Informatique et ses Applications
2023

University of British Columbia
2023

University of Zurich
2023

Lung Institute
2021

Cegep de Sainte Foy
2003-2018

McGill University Health Centre
2016

It is common practice to restore and maintain sinus rhythm in patients with atrial fibrillation heart failure. This approach based part on data indicating that a predictor of death failure suggesting the suppression may favorably affect outcome. However, benefits risks this have not been adequately studied.We conducted multicenter, randomized trial comparing maintenance (rhythm control) control ventricular rate (rate left ejection fraction 35% or less, symptoms congestive failure, history...

10.1056/nejmoa0708789 article EN New England Journal of Medicine 2008-06-18
Ratika Parkash George A. Wells Jean L. Rouleau Mario Talajic Vidal Essebag and 95 more Allan C. Skanes Stephen B. Wilton Atul Verma Jeff S. Healey Laurence D. Sterns Matthew T. Bennett Jean-François Roux Léna Rivard Peter Leong‐Sit Mats Jensen‐Urstad Umjeet Jolly François Philippon John L. Sapp Anthony Tang Paul C. MacDonald Matthew T. Bennett Santabhanu Chakrabarti John A. Yeung‐Lai‐Wah Andrew Ignaszewski Stanley Tung Shahnawaz Virani Marc W. Deyell Andrew Krahn Jason G. Andrade Lynn Straatman Mustafa Toma Graham C. Wong Matthew Wei Isabelle Greiss Jean‐Marc Raymond Benoit Coutu Paolo Costi Fadi Mansour Wouter Saint-Phard Isabelle Denis Julie Fleury Jean-François Roux F. Ayala‐Paredes Mariano Badra‐Verdu Charles Dussault Nadia Vachon Véronique Dagenais C. Lamoureux Jeff S. Healey Stuart J. Connolly CS Ribas Syamkumar Divakaramenon Jorge Wong Guy Amit Wendy L. Meyer Isabelle Nault Jean Champagne J. Sarrazin Gilles O’Hara François Philippon L. Blier Benoît Plourde Christian Steinburg Karine Roy Paule Banville Brigitte Ottinger Marie‐Eve Boucher Marina P. Sánchez Léna Rivard Marc Dubuc Peter G. Guerra Katia Dyrda Paul Khairy Laurent Macle Blandine Mondésert Denis Roy Mario Talajic Bernard Thibault Rafik Tadros Véronique Roy Damian Redfearn Hoshiar Abdollah Adrián Baranchuk Kevin Michael Christopher S. Simpson Sharlene Hammond Stephen B. Wilton Brian Clarke Carlos A. Morillo Vikas Kuriachan George D. Veenhuyzen Russell Quinn Derek V. Exner Jonathan G. Howlett Jennifer McKeage Peter Leong‐Sit Lorne J. Gula Allan C. Skanes Jaimie Manlucu Anthony Tang

Background: Atrial fibrillation (AF) and heart failure (HF) frequently coexist can be challenging to treat. Pharmacologically based rhythm control of AF has not proven superior rate control. Ablation-based was compared with evaluate if clinical outcomes in patients HF could improved. Methods: This a multicenter, open-label trial blinded outcome evaluation using central adjudication committee. Patients high-burden paroxysmal (>4 episodes 6 months) or persistent (duration <3 years) AF,...

10.1161/circulationaha.121.057095 article EN Circulation 2022-03-22

Background— Postoperative atrial fibrillation (POAF) is a highly prevalent complication after cardiac surgery with substantial effects on outcomes. Previous studies have reported that obesity risk factor for POAF surgery. However, it unknown whether the metabolic syndrome (MS) also increases of postoperative fibrillation. Methods and Results— We retrospectively analyzed association between MS incidence new-onset in total 5085 patients who underwent isolated coronary artery bypass grafting no...

10.1161/circulationaha.106.681304 article EN Circulation 2007-09-10

Diagnosis of arrhythmic disorders is challenging because their short-lasting, intermittent character. Conventional technologies noninvasive ambulatory rhythm monitoring are limited by modest sensitivity. We present a novel form wearable electrocardiogram (ECG) sensors providing an alternative tool for long-term with the potential increased sensitivity to detect or subclinical arrhythmia. The objective was assess signal quality and R-R coverage ECG sensor system compared standard 3-lead...

10.3390/bios9010017 article EN cc-by Biosensors 2019-01-21

Background: Left atrial appendage closure is an established therapy in patients with fibrillation. Although device-related thrombosis (DRT) relatively rare, it potentially linked to adverse events. As data on DRT characteristics, outcome, and treatment regimen are scarce, we aimed assess these questions a multicenter approach. Methods: One hundred fifty-six the diagnosis of after left were included multinational EUROC-DRT registry. Baseline characteristics clinical echocardiographic data....

10.1161/circinterventions.120.010195 article EN Circulation Cardiovascular Interventions 2021-05-01

Growing evidence has demonstrated the clinical benefit of percutaneous left atrial appendage closure (LAAC) in patients with fibrillation. Although procedural complication rates have declined increasing experience, post-procedural device-related complications persist, impacting prognosis and reducing long-term benefits procedure. Given potential impact these complications, surveillance imaging after LAAC is mandatory. Currently, different modalities offer unique advantages to manage which...

10.1093/ehjci/jeaf078 article EN cc-by-nc European Heart Journal - Cardiovascular Imaging 2025-03-03

We recently demonstrated that metabolic syndrome (MetS) is an independent risk factor for postoperative atrial fibrillation (POAF) following coronary artery bypass grafting (CABG). In the present work, we sought to determine which feature of MetS associated with POAF. retrospectively analysed association between features and incidence new-onset POAF in a total 2214 male patients <65 years who underwent first isolated CABG. Anthropometric data including waist circumference (WC) complete...

10.1093/eurheartj/ehp091 article EN European Heart Journal 2009-03-27

Background —Several cases of unexpected death have been reported with sildenafil in patients predisposed to ischemic cardiac events. Although acute episodes ischemia could account for some these deaths, we hypothesized that may unsuspected electrophysiological effects predisposing proarrhythmia. Methods and Results —Studies were undertaken 10 isolated guinea pig hearts demonstrated prolongation repolarization a reverse use-dependent manner by 30 μmol/L. Action potential duration increased...

10.1161/01.cir.102.3.275 article EN Circulation 2000-07-18

CYP2D6 is involved in the O-demethylation metabolic pathway of venlafaxine humans. In this study, we investigated whether isozyme stereoselective. Plasma samples from seven extensive metabolizers (EMs) and five poor (PMs), collected during a period without with coadministration quinidine, were analysed. Subjects administered hydrochloride 18.75 mg orally every 12 h for 48 on two occasions (1 week apart); once alone concomitant administration quinidine sulphate h. Blood urine under...

10.1097/00008571-200301000-00006 article EN Pharmacogenetics 2003-01-01

CYP2D6 is the major enzyme involved in metabolism of venlafaxine. Subjects with a low activity have increased plasma concentrations venlafaxine that may predispose them to cardiovascular side effects. In vitro and vivo studies showed diphenhydramine, nonprescription antihistamine, can inhibit activity. Therefore, authors investigated this study potential drug interaction between diphenhydramine Fifteen male volunteers, nine extensive metabolizer (EM) six poor (PM) phenotype CYP2D6, received...

10.1097/00004714-200104000-00009 article EN Journal of Clinical Psychopharmacology 2001-04-01
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