Where the heart leads4/13/2023 We will demonstrate how and where to attach the leads in certain places. We will present the basic clinical aspects of the 12-lead. This course is meant to give the nurse a practical education concerning the 12-lead EKG. It is a normal tracing (shows normal sinus rhythm). A 12-lead ECG consists of three bipolar limb leads (I, II, and III), the unipolar limb leads (AVR, AVL, and AVF), and six unipolar chest leads, also called precordial or V leads, (, ,, ,, and ).īelow is a sample of a 12-lead EKG tracing. A lead composed of a single positive electrode and a reference point is a unipolar lead.įor a routine analysis of the heart’s electrical activity an ECG recorded from 12 separate leads is used. A lead composed of two electrodes of opposite polarity is called bipolar lead. ![]() However, neither the electrical activity that results from the generation and transmission of electrical impulse, nor the mechanical contractions or relaxations of the atria and ventricles appear in the electrocardiogram.Īn EKG lead consists of two surface electrodes of opposite polarity (one positive and one negative) or one positive surface electrode and a reference point. This electrical activity is readily detected by electrodes attached to the skin. The electrocardiogram is a graphic record of the direction and magnitude of the electrical activity generated by the depolarization and repolarization of the atria and ventricles of the heart. This section will give you a basic understanding of how to take a 12-lead EKG, how to place the leads, and how to begin to interpret the tracing. It will take much practice of you to be able to interpret a 12-lead ECG tracing. ![]() This section is meant only as an introduction to the 12-lead ECG. This allows an experienced interpreter to see the heart from many different angles. Each lead is meant to pick up electrical activity from a different position on the heart muscle. The 12-lead ECG gives a tracing from 12 different “electrical positions” of the heart. This chapter presents an introduction to the 12-lead ECG.
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