ABC | Volume 111, Nº5, November 2018

Original Article Rattanawong et al PR interval and chronic resynchronization therapy Arq Bras Cardiol. 2018; 111(5):710-719 1. Epstein AE, Di Marco JP, Ellenbogen KA, Estes NA3rd, Freedman RA, Gettes LS, et al. 2012 ACCF/AHA/HRS focused update incorporated into the ACCF/ AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology Foundation/ American Heart Association Task Force on Practice Guidelines and the Heart Rhythm Society. J Am Coll Cardiol. 2013;61(3):e6-75. 2. FriedmanDJ, BaoH, Spatz ES, Curtis JP, Daubert JP, Al-Khalib SM. Association between a prolonged PR interval and outcomes of cardiac resynchronization therapy: a report from theNational Cardiovascular Data Registry. Circulation, 2016;134(21):1617-28. 3. Waggoner AD, Kalathivetil S, Spence KE, D'avila Roman VG, de las Fuentes L. 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