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Conduction and the 12-Lead EKG Marjorie G. Webb, DNP, RN, ACNP-BC Discuss conduction as reflected by the 12lead electrocardiogram • • • • • Definition of EKG Limb leads Precordial leads Vectors Putting it all together A Little History… History Lesson • Kollicker & Mueller • Ludwig & Waller • Einthoven History Lesson Voila! EKG Electrical Impulse of the Heart • Muscle cells of the heart are negatively charged (polarized) in their resting state. • When heart muscle is electrically stimulated the cells become positively charged (depolarized) and this causes them to contract. Electrical Impulse of the Heart • We are interested in how the electrical impulse is conducted through cardiac tissue. Definition of EKG Recording of the electrical activity of the heart Definition of EKG Recording of the electrical activity of the heart Definition of EKG Definition of EKG EKG as a diagnostic tool Limb Leads Einthoven’s Triangle Limb Leads Limb Leads Limb Leads Limb Leads Einthoven’s Triangle Limb Leads Einthoven’s Triangle Limb Leads Einthoven’s Triangle Limb Leads Limb Leads Chest Leads Chest Leads Chest Leads Chest Leads Chest Leads Chest Leads Chest Leads Chest Leads Voila! 12- Lead EKG Electrical Impulse of the Heart • The EKG gives us information about how the electrical impulse is moving through the heart. Electrical Impulse of the Heart • The 12-lead EKG gives us 12 different views of the movement of the electrical impulse through the heart. Electrical Impulse of the Heart • Brief review of EKG complex
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