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Introduction To ECG for Medical Students Presentation

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INTRODUCTION TO ECG for Medical Students Dr Kareem Lookman MB;BS, MSc, PDE, FMCP WHAT IS ECG? • Voltage – time tracing of electrical activity of the heart viewed from the surface ( electro= electrical activity, cardio = heart, gram = recording) • Tracing represents the electrical activity of the heart viewed from the lead • The vector sum of all the depolarization and repolarization potentials of all the myocardial cells • Simple, cheap, non invasive and easy to perform. • The position of the heart within the body determines the “view” of the cardiac electrical activity recorded from any ECG electrode on the body surface. 2 Usefulness of ECG: Diagnosis of the following • Heart muscle enlargement • Conduction blocks • Heart muscle ischemia • Heart muscle infarction • Specific artery involved in CAD • Problem with heart rate and regularity • Electrolyte abnormalities e.g K+,Ca2+ • Thyroid gland disease • Drug toxicity • CNS Disorders 3 ECG Leads      The cardiac electrical activity is recorded through 12 surface leads Namely I, II, III, aVR, aVL, aVF- limb leads V1, V2, V3, V4, V5, and V6- chest leads Limb leads look at the heart from the coronal plane Chest leads look at the heart in a horizontal plane from the front and around the side of the chest 4 Position of Chest Leads 5 Precordial Leads 2004 Anna Story 6 I and AVL V3 & v4 V1 & v2 V5 & v6 II, III and AVF 2004 Anna Story Where the positive elec ...
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