6 potential causes of dominant R waves in V1: A. Right ventricular hypertrophy, right bundle branch block, posterior wall MI, right atrial enlargement, right atrial infarction, Wolf-Parkinson-White syndrome B. Left ventricular hypertrophy, left bundle branch block, anterior wall MI, left atrial enlargement, left atrial infarction, Wolf-Parkinson-White syndrome C. Right ventricular hypertrophy, right bundle branch block, anterior wall MI, right atrial enlargement, right atrial infarction, Wolff-Parkinson-White syndrome D. Left ventricular hypertrophy, left bundle branch block, posterior wall MI, left atrial enlargement, left atrial infarction, Wolff-Parkinson-White syndrome