1 / 28

ECG LEADS

ECG LEADS. Chapter 3. introduction. The heart produces electrical currents The body acts as a conductor of electricity. introduction. An ECG is a recording of the electrical activity of the heart Different “views” of the heart can be recorded using different electrodes. INtroduction.

ramona-harmon
Download Presentation

ECG LEADS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECG LEADS • Chapter 3

  2. introduction • The heart produces electrical currents • The body acts as a conductor of electricity

  3. introduction • An ECG is a recording of the electrical activity of the heart • Different “views” of the heart can be recorded using different electrodes

  4. INtroduction • Electrodes are able to measure the voltages of the cardiac current

  5. Electrodes

  6. Electrodes • V1: Fourth intercostal space to the right of the sternum. • V2: Fourth intercostal space to the Left of the sternum. • V3: Directly between leads V2 and V4. • V4: Fifth intercostal space at midclavicular line. • V5: Level with V4 at left anterior axillary line. • V6: Level with V5 at left midaxillary line. (Directly under the midpoint of the armpit)

  7. Electrode placement

  8. Electrode and Lead are not the same thing.

  9. Leads • 12 possible leads • Six limb (extremity) leads • Bipolar leads: I, II, and III • Unipolar leads: aVR, aVL, aVF • Six chest (precordial) leads

  10. limb leads • Electrodes • Right arm • Left arm • Left leg • Right leg (ground)

  11. lead i • LA = electrical voltages of the heart that are transmitted to the left arm • RA = electrical voltages of the heart that are transmitted to the right arm • The electrocardiograph sustracts RA from LA and the difference appears as lead I.

  12. lead i • Lead one ‘travels’ horizontally. • Its left pole (LA) is postive and its right pole (RA) is negative. • Therefore, lead I = LA minus RA • Shows a positive wave when an impluses moves towards the left arm, negative wave when an impuse moves away from the left arm.

  13. Lead II • Lead II points downward diagonally • Lower pole (LL) is positive and upper pole (RA) is negative. • Lead II = LL minus RA

  14. Lead III • Lead III points downward diagonally • Lower pole (LL) is positive and upper pole (LA) is negative. • Lead III = LL minus LA

  15. Bipolar Leads

  16. Unipolar or Augmented limb leads • Record the electrical voltages at one location rather than relative to the voltage at another electrode

  17. limb leads • aVR + aVL + aVF = 0

  18. Limb leads • Bipolar leads & Unipolar (or augmented) leads • Frontal plane

  19. Limb leads

  20. chest leads • V1 to V6 • unipolar • horizontal plane • front to back

  21. Chest Leads

  22. ALL 12 leads Frontal Plane Horizontal Plane

  23. Monitor leads • 12 leads are not always necessary • Sample of a monitor lead • V1 (positive) • Right shoulder (negative) • Left shoulder (ground)

  24. Holter Monitors

More Related