Introduction to Clinical Electrophysiology and the ECG 12 Lead ECG Course A slide presentation prepared by Dr. Michael Mazzini, M.D., Boston University Medical Center. Start This EKG Course Table of Contents 1Introduction 2Ion Movement 3Basic Electrophysiology 4Electrocardiology 5Electrocardiogram 612 Lead ECG 7ECG Limb Leads 812 Lead ECG Interpretation 9Determining Heart Rate 10Rhythm 11QRS Axis 12Intervals 13QRS Complex 14ST Segment & T Wave 15Bundle Branch Block 16Ventricular Hypertrophy 17Atrial Enlargement 18Premature Beats 19References