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EKG CH 2

  1. What change occurs in depolarization and HOW is this done?
    • cardiac cell change from - to +
    • Na and K ions exchanging places
  2. What does depolarization cause to happen in the wave?
    Wave→electrical current→discharge of electricity
  3. What change occurs in repolarization? HOW?
    • cardiac cells become - again 
    • Na/K pumps (active transport system)
  4. What does depolarization/repolarization cause the heart to do
    • contract 
    • relax
  5. What kind of events are depolar and repolar?
    electrical
  6. What kind of events are contraction and relaxation of the heart
    mechanical
  7. How are mechanical events measured
    HR and BP
  8. What are the 3 refractory periods
    absolute, relative, and supernormal
  9. Absoute
    NO stimulus can cause depolarization
  10. Relative
    if STRONG ENOUGH then it can cause depolar
  11. Supernormal
    WEAK stimulus can cause depolar
  12. What constitutes as 1 heart beat
    each P-QRS-T sequence
  13. Define P wave
    atrial depolarization
  14. What kind of wave or event is usually NOT seen. WHY?
    • arial repolarization (Ta wave)
    • occurs at same time as QRS complex
  15. Define QRS complex
    ventricular depolar
  16. Define T wave
    Ventricular repolarization
  17. Where should you look for any abnormalities?
    within the ST segment
  18. Define U wave
    LATE ventricular repolarization, usually not seen
  19. PR interval measures what? Time?
    • flat line that measures atrial depolarization 
    • 0.12-0.20
  20. QRS complex measures what? Time?
    • ventricular depolar
    • 0.04-0.10
  21. ST segment measures what
    Flat line that measures between QRS and T wave
  22. QT segment measures what
    • entire ventricular depolar and repolar 
    • from QRS complex to END of T wave
  23. What is the baseline also called and what is it
    • isoelectric line 
    • flat line between T wave and P wave of next beat
  24. What are pacemaker cells
    area on conduction that initiates electrical impulses
  25. What are the 3 parts of the conduction system
    SA node, AV junction, ventricle
  26. SA node
    heart's normal pacemaker (60-100bpm)
  27. AV junction
    backup pacemaker (40-60)
  28. ventricle
    lowest backup (20-40)
Author
maria_mm_10
ID
331690
Card Set
EKG CH 2
Description
EKG CH 2
Updated

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