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Herman ARM, Cheung C, Gerull B, Simpson CS, Birnie DH, Klein GJ, Champagne J, Healey JS, Gibbs K, Talajic M, Gardner M, Bennett MT, Steinberg C, Janzen M, Gollob MH, Angaran P, Yee R, Leather R, Chakrabarti S, Sanatani S, Chauhan VS, Krahn AD. Outcome of Apparently Unexplained Cardiac Arrest: Results From Investigation and Follow-Up of the Prospective Cardiac Arrest Survivors With Preserved Ejection Fraction Registry. Circ Arrhythm Electrophysiol 2016; 9:e003619. [PMID: 26783233 DOI: 10.1161/circep.115.003619] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The Cardiac Arrest Survivors with Preserved Ejection Fraction Registry (CASPER) enrolls patients with apparently unexplained cardiac arrest and no evident cardiac disease to identify the pathogenesis of cardiac arrest through systematic clinical testing. Exercise testing, drug provocation, advanced cardiac imaging, and genetic testing may be useful when a cause is not apparent. METHODS AND RESULTS The first 200 survivors of unexplained cardiac arrest from 14 centers across Canada were evaluated to determine the results of investigation and follow-up (age, 48.6±14.7 years, 41% female). Patients were free of evidence of coronary artery disease, left ventricular dysfunction, or evident repolarization syndromes. Advanced testing determined a diagnosis in 34% of patients at baseline, with a diagnosis emerging during follow-up in 7% of patients. Of those who were diagnosed, 28 (35%) had an underlying structural condition and 53 (65%) had a primary electric disease. During a mean follow-up of 3.15±2.34 years, 23% of patients had either a shock or an appropriate antitachycardia pacing from their implantable cardioverter defibrillator, or both. The implantable cardioverter defibrillator appropriate intervention rate was 8.4% at 1 year and 18.1% at 3 years, with no clear difference between diagnosed and undiagnosed subjects, or between those diagnosed with a primary electric versus structural pathogenesis. CONCLUSIONS Obtaining a diagnosis in previously unexplained cardiac arrest patients requires systematic clinical testing and regular follow-up to unmask the cause. Nearly half of apparently unexplained cardiac arrest patients ultimately received a diagnosis, allowing for improved treatment and family screening. A substantial proportion of patients received appropriate implantable cardioverter defibrillator therapy during medium-term follow-up. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00292032.
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Affiliation(s)
- Adam R M Herman
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Christopher Cheung
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Brenda Gerull
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Christopher S Simpson
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - David H Birnie
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - George J Klein
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Jean Champagne
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Jeffrey S Healey
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Karen Gibbs
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Mario Talajic
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Martin Gardner
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Matthew T Bennett
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Christian Steinberg
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Mikyla Janzen
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Michael H Gollob
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Paul Angaran
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Raymond Yee
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Richard Leather
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Santabhanu Chakrabarti
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Shubhayan Sanatani
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Vijay S Chauhan
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.)
| | - Andrew D Krahn
- From the Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada (A.R.M.H., C.C., K.G., M.T.B., C.S., M.J., S.C., A.D.K.); Department of Cardiovascular Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada (B.G.); Division of Cardiology, Department of Medicine, Queen's University, Kingston, ON, Canada (C.S.S.); University of Ottawa Heart Institute, Ottawa, ON, Canada (D.H.B.); Division of Cardiology, Department of Medicine, Western University, London, ON, Canada (G.J.K., R.Y.); Department of Medicine, Quebec Heart and Lung Institute, Quebec City, QC, Canada (J.C.); Division of Cardiology, Department of Medicine, Population Health Research Institute, Hamilton, ON, Canada (J.S.H.); Department of Medicine, Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada (M.T.); Division of Cardiology, Department of Medicine, QEII Health Sciences Center, Halifax, NS, Canada (M.G.); Division of Cardiology, Department of Medicine, University Health Network, Toronto, ON, Canada (M.H.G., V.S.C.); Division of Cardiology, Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada (P.A.); Division of Cardiology, Department of Medicine, Royal Jubilee Hospital, Victoria, BC, Canada (R.L.); and Division of Cardiology, Department of Pediatrics, BC Children's Hospital, Vancouver, BC, Canada (S.S.).
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