EKG Basic

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EKG Basic
2011-10-12 16:02:13

EKG Vocab
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  1. P Wave
    P wave represents the combined depolarization of the atria
  2. 1 small box
    0.04 sec long
  3. 5 small boxes
    • 1 big box
    • 5 mm high
    • 0.2 sec long
  4. 30 big boxes
    • 6 sec long
    • Typical view
    • multiply by 10 to get heart rate
  5. The PR Interval
    • Represents the pause while the AV node holds the impulse from the atria
    • Allows the complete contraction of the atria
    • Should be between .12 - .20 seconds
  6. The QRS
    • Represents the depolarization of the ventricles and the repolarization of the atria
    • Repolarization of the atria is hidden by the huge electrical discharge of the ventricles
    • Should be less than .12 seconds
  7. Q wave
    first negative deflection after P wave
  8. R wave
    First positive after P wave
  9. S wave
    Negative deflection below baseline after R or Q wave
  10. The T-wave
    Represents the repolarization of the ventricles

    Contains the absolute and relative refractory periods
  11. J Point- ends? begins?
    Juncture point- Where the QRS complex ends and ST begins
  12. Limb Leads aka bipolar leads
    • LA Left ARM Black
    • LL Left LEG Red
    • RA Right ARM White
    • RL Right LEG Green
    • "Smoke over fire, Snow over Grass"
  13. Chest Leads aka Precordial Leads
    V1 – V6
  14. V1
    4th intercostal space, right of sternum
  15. V2
    4th intercostal space, left of the sternum
  16. V3
    between V4 and V2
  17. V4
    5th intercostal space, mid-clavicular line
  18. V5
    lateral to V4, anterior axillary line
  19. V6
    lateral to V5, mid-axillary line
  20. SA Node
    Sinoatrial or Sinus Node

    Located in the Right Atrium near the Vena Cava

    Serves as the heart’s pacemaker
  21. Internodal Pathways
    Anterior, middle, and posterior pathways

    Transmits the impulse from the SA to AV node through the atria

    Found in the walls of the Right Atrium and Septum
  22. AV Node
    Artioventricular Node

    Located in the wall of the Right Atrium near the Tricuspid Valve

    Responsible for slowing down conduction from the atria to the ventricles

    Allows for the “atrial kick” to occur before the ventricles contract
  23. Bundle of His
    • The portion of the electrical system from the AV node to the Bundle Branches
    • Found partially in the lower wall of the Right Atrium and in the Septum

    Only route of communication between the atria and ventricles
  24. Left Bundle Branch
    Begins at the Bundle of His and runs down into the Left Ventricle

    The upper portion has fibers that innervate the Left Ventricle and the upper portion of the Septum

    First area of the ventricles to fire

    Breaks into the Left Anterior and Left Posterior Fascicles

    Ends in the Purkinje fibers
  25. Right Bundle Branch
    Begins at the Bundle of His and runs down into the Right Ventricle

    Terminates at the Purkinje fibers
  26. Purkinje Fibers
    Individual cells just beneath the endocardium

    Directly innervate the myocardial cells

    Initiate the ventricular depolarization cycle
  27. Atria
    Help fill the ventricles
  28. Ventricles
    Push blood out of the heart
  29. Vena Cava System
    Brings blood back into the heart from the body
  30. Pulmonary Artery
    Takes blood to the lungs
  31. Pulmonary Veins
    Brings blood from the lungs into the heart
  32. Aorta
    Takes blood to the body
  33. Bloodflow through the heart to the lungs
  34. Inferior and Superior Vena Cava
    • Right Atrium
    • Tricuspid Valve
    • Right Ventricle
    • Pulmonic Valve
    • Pulmonary Artery
    • Lungs
  35. Bloodflow from the lungs
    • Pulmonary Veins
    • Left Atrium
    • Mitral Valve
    • Left Ventricle
    • Aortic Valve
    • Aorta