Conduction System

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  1. What is the pacemaker of the heart
    SA node
  2. The bundle of tissue that gathers the electricity that has spread throughout the heart after the SA node has initiated electricity
    AV Junction/Node
  3. The AV node releases the electricity to travel down
    The Bundle of His
  4. If there is a bundle branch block the _____ will be _____ on an EKG
    • QRS will be fat
    • (not dangerous..."a bundle branch block doth not an arrhythmia make")
  5. EKG can tell about:
    • Electrical Function
    • (Rhythm disturbances, Conduction disturbances- bundle branch block)
  6. EKG cannot tell about:
    • Mechanical Function
    • (Structural Disorders-- valve disorders, Perfusion Disorders)

    **An EKG can't show you low ejection fraction or that a heart isn't pumping well...only electrical)
  7. EKG can reflect electrical activity, not mechanical activity. To evaluate mechanical function assess:
    BP, Urinary Output, LOC, Capillary Refill, and Peripheral Pulses
  8. Depolarization of the heart means it is:
    Stimulating the heart muscle
  9. Repolarization of the heart means that the heart muscle is:
    • Resting
    • (if anything interrupts the heart during repolarization [resting], it gets irritable!)
  10. If you are dehydrated your sodium levels will:
    • GO UP!!!
    • (sodium and potassium levels are critical to life)
  11. Atrial Depolarization makes a ____ wave on the EKG...shows stimulation of the atrium
    P wave
  12. Place on the EKG where the AV node has gathered all of the electricity
    PR interval (from beginning of P to the QRS complex)
  13. We can tell if the heart is healthy based on the _______ on the EKG
    PR interval
  14. Place on the EKG that shows stimulation (depolarization) of the ventricles
    QRS complex
  15. A normal QRS complex should be ___ because both ventricles should be stimulated fast
  16. After the ventricles are stimulated (as marked by the QRS) they need to rest and repolarize...this is indicated on an EKG as:
    • T wave
    • (time of electrical ventricular rest/repolarization)

    ...this is the vulnerable part of the cycle because if anything interupts this rest, it irritates the muscle
  17. Vulnerable part of cardiac electrical cycle, if anything interrupts this part the heart becomes irritable:
    T wave (repolarization)
  18. Each cardiac Cycle should produce a
  19. Inherent Rate of Sinus Node
  20. Inherent Rate of AV Junction
    40-60 bpm
  21. Inherent rate of Ventricle
    20-40 bpm
  22. Sinus Tachycardia is treated by:
    Treating the cause!! (ie: taking a test, exercising, infection)
  23. Example of something that could kill of SA node:
    Inferior MI that affects coronary artery
  24. Always check ____ before Digoxin
    Apical Pulse
  25. If the SA node is killed off, the ____ picks up
    AV node
  26. If the AV node is killed off, the _____ pick up
  27. Pacemaker Rule:
    Pacemaker site with the fastest rate will generally control the heart

    (SA node > AV node > Ventricles)
  28. Sympathetic Branch increases:
    • Heart Rate
    • Conduction
    • Irritability

    (Works as accelerator! Epinephrine is released)
  29. Parasympathetic branch decreases:
    • Heart Rate
    • Conduction
    • Irritability

    (slows everything Digoxin)
  30. On EKG paper, from "notch" to "noctch" is how long:
    3 seconds
  31. Each tiny little box on an EKG is how long
    .04 seconds
  32. Each big block on EKG (made of 5 little boxes) is how long?
    .2 seconds
  33. Normal PR interval
  34. Normal QRS duration is:
  35. Explain Normal Sinus Rhythm on an EKG
    • Impulse is coming from the SA node.
    • HR is between 60-100
    • There is a P wave for every QRS
    • The PR interval is between .12-.20 seconds
    • Skinny QRS complexes between .06-.12
    • Each QRS is equal
  36. Treatment for Normal Sinus Rhythm:
    There is NONE
  37. When do you treat for Sinus Bradycardia
    Only if there are symptoms of sinus bradycardia
  38. How do you treat Sinus Tach
    Treating the cause
Card Set:
Conduction System
2014-09-20 01:21:41
Cardio Day Three

Cardio Day Three
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