Cardiac Dysrhythmias

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  1. The purpose of the electrical conduction system of the heart?
    Initiates an impulse whose purpose is to stimulate the mechanical cells of the heart to contract
  2. What two things verify that cardiac contraction has occured?
    Blood Pressure and Pulse
  3. Sinoatrial Node
    Pace maker of the heart
  4. Sinoatrial node firing rate?
    60 - 100 bpm
  5. Atrioventricular node (AV node) firing rate?
    40 - 60 bpm
  6. Period from the beginning of one heartbeat to the beginning of the next
    Cardiac cycle
  7. Three complexes in a cardiac cycle?
    • P wave
    • QRS complex
    • T wave
  8. The best view to read a ECG?
    Lead 2 or MCL
  9. When the ECG does not detect electrical current or positive and negative electrical activity are equal, a straight line is produced; which is called?
    Isoelectric line
  10. The first wave of the cardiac cycle
    P wave
  11. What does the P wave represent?
    Atrial depolarization ( Contraction)
  12. Normal P waves appear to be what shape?
  13. The electrical impulse that spreads from the R. to L. atrium comes from where?
    When the SA node fires
  14. Disorders that change atrial size cause what in the P wave?
    Alterations of shape and size
  15. This segment represents the time it takes the electrical impulse to travel from the SA node to the AV node.
    PR interval
  16. The normal amount of time of the PR interval?
    0.12 - 0.20
  17. Complex represents ventricular depolarization (contraction), composed of what three waves?
    • QRS complex
    • Q, R, S, waves
  18. The first downward deflection after the P wave?
    Q wave
  19. The first upward deflection after the P wave?
    R wave
  20. The first negative deflection after the R wave?
    S wave
  21. This wave represents ventricular repolarization ( relaxation) .
    T wave
  22. The resting state of the heart, when the ventricles are filling up with blood and preparing to receive the next impulse?
    Ventricular repolarization
  23. The time from completion of a contraction to recovery of myocardial tissue for the next impulse?
    ST segment
  24. What happens to the ST segment with cardiac injury?
    The ST segment elevates from the Isoelectric line
  25. What is the 6 step process for dysrhythmia interpretation?
    • 1. Regularity of rhythm?
    • 2. HR
    • 3. Is there P waves in front of QRS complex
    • 4. PR interval
    • 5. QRS interval normal?
    • 6. QT segment normal?
  26. True or False:
    An irregular rhythm can be regularly irregular which means it has a predictable pattern of irritability or irregularly irregular, without any pattern of irregularity?
  27. Normal cardiac rhythm?
    Normal Sinus Rhythm
  28. What makes the Normal sinus, a normal cardiac rhythm?
    because it begins in the SA node, and has a complete, regular cardiac cycles at 60 - 100 bpm
  29. Has the same cardiac cycle components as a normal sinus rhythm, except a slower HR.
    Sinus bradycardia
  30. What can cause Sinus bradycardia
    • Digoxin
    • electrolyte imbalances
    • MI
  31. What are signs and symptoms of sinus bradycardia
    fainting or fatigue
  32. Has the same components as a normal sinus, except the heart rate is more than 100 bpm
    Sinus Tachycardia
  33. Etiology of sinus tachcycadia?
    • Fever
    • Hemorrhage
    • epinepherine
  34. Signs and symptoms of Sinus tachy
    • Rapid HR for long periods of time
    • Angina
    • Dyspnea
Card Set:
Cardiac Dysrhythmias
2013-09-28 15:09:15

Chapter 25
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