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Ecg 12 Lead Introduction

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Submitted By traumagirl911
Words 1425
Pages 6
An Introduction to the
12 lead ECG
& Acute MI changes a lecture for student nurses

Dr Kofi Amu-Darko
MB. ChB. DRCOG. DFFP. MRCGP. PgDip. LLM
Family Physician
Charles Curtis Memorial Hospital
October 2008
1

By the end of this lecture, you will be able to: • Understand the 12 lead ECG in relation to the coronary circulation and myocardium
• Perform an ECG recording
• Identify the ECG changes that occur in the presence of an acute coronary syndrome.
• Begin to recognize and diagnose an acute
MI.

2

What is a 12 lead ECG?
 Records the electrical activity of the heart
(depolarization and depolarization of the myocardium)
 Views the surfaces of the left ventricle from 12 different angles

3

Anatomy and Physiology
Review
 A good basic knowledge of the heart and cardiac function is essential in order to understand the 12 lead
ECG
 Anatomical position of the heart
 Coronary Artery Circulation
 Conduction System

4

Anatomical Position of the Heart
 Lies in the mediastinum behind the sternum
 between the lungs, just above the diaphragm
 the apex (tip of the left ventricle) lies at the fifth intercostal space, mid-

clavicular line

5

6

Coronary Artery Circulation
Right Coronary Artery
 right atrium
 right ventricle
 inferior wall of left ventricle  posterior wall of left ventricle  1/3 interventricular septum 7

Coronary Artery Circulation
Left Main Stem Artery divides in two:
Left Anterior Descending
Artery
 antero-lateral surface of left ventricle
 2/3 interventricular septum
Circumflex Artery
 left atrium
 lateral surface of left ventricle 8

9

The standard 12 Lead ECG
6 Limb Leads avR, avL, avF, I, II, III

6 Chest Leads (Precordial leads)
V1, V2, V3, V4, V5 and V6

Rhythm Strip

10

11

Limb Leads
3 Unipolar leads
 avR - right arm (+)

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