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-Intro 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