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Your Electrical Heart

Your Electrical Heart. Exploring EKG. Objectives. Find and interpret patterns on an EKG graph Describe the electrical and mechanical components of a normal heart rhythm Draw appropriate conclusions about the mechanics of various normal and abnormal heart functions based on EKG. Introduction.

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Your Electrical Heart

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  1. Your Electrical Heart Exploring EKG

  2. Objectives • Find and interpret patterns on an EKG graph • Describe the electrical and mechanical components of a normal heart rhythm • Draw appropriate conclusions about the mechanics of various normal and abnormal heart functions based on EKG

  3. Introduction • When have you heard the terms “V-tac”, “V-fib”, “asystole”? • What is an EKG or ECG? • What do you think a normal graph of the heart’s electrical activity looks like? (draw it) • Why do doctors and nurses need EKGs? Depiction of electrical activity in the heart Detect & diagnose problems with the patient’s heart rhythm

  4. Review and new terms • Left & right atria: receive blood from the veins, pump it into ventricles • Left & right ventricles: receive blood from atria, pump it out into arteries • Sinoatrial (SA) node: bundle of nerves in R atrium, the heart’s pacemaker, stims contraction of atria • Atrioventricular (AV) node: between atria & ventricles, continues rhythm set by SA node, stims contraction of ventricles • Purkinje fibers: fan out and stimulate contraction of ventricles

  5. Review: the cardiac cycle • How blood moves through the heart • Blood enters atria>>pressure in A rises>>AV valves open • Blood enters ventricles>>pressure in V rises>>AV valves close>>semilunar valves open>>blood leaves heart • Pressure in V falls>>S/L valves close

  6. To Do and Notice • Look at your EKG strip. • Determine the patient’s heart rate in BPM if this is a 6 second rhythm strip. • Is the rhythm consistent? (describe) • How is your strip similar to a normal EKG? How is it different? • Based on what you know about the cardiac cycle, try to explain what is going wrong with this heart. • Present your patient to the class.

  7. What’s Going On? • What terms and conditions do we learn from the EKGs?

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