Critical Care Nursing

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Author:
plbernal
ID:
172772
Filename:
Critical Care Nursing
Updated:
2012-09-23 22:05:40
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Conduction system
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Description:
Conduction System and Introduction to Rhythm Analysis
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  1. What are the 4 primary activities of the cardiac cells?
    • Automaticity
    • Excitability
    • Conductivity
    • Contractility
  2. The ability of cardiac muscle cells to generate their own electrical impulses spontaneously
    Automaticity
  3. Abilty of the cardiac cells to respond to an impulse
    Excitability
  4. Ability of the cardiac cells to receive an electrical impulse and transmit it to the other cardiac cells
    Conductivity
  5. Ability of the cardiac cells to contract
    Contractility
  6. The cardiac cycle is composed of what two activities?
    • Electrical
    • Mechanical
  7. What activity is caused by automaticity?
    Electrical
  8. What activity is the contraction?
    Mechanical
  9. What are the 2 phases of the electrical activity?
    • depolarization
    • repolarization
  10. What phase is depolarization?
    Active phase
  11. What phase is repolarization?
    Resting phase
  12. What are the 2 mechanical responses?
    • Systole
    • Diastole
  13. During depolarization is it systole or diastole? Is it contraction or resting?
    • Systole
    • Contraction
  14. During repolarization is it systole or diastole? Is it contraction or resting?
    • Diastole
    • Resting or filling
  15. What happens before a mechanical activity?
    Electrical activity
  16. What is happening during ventricle repolarization?
    The ventricles are filling with blood
  17. Vulnerable phase (Twave) is when enough cells have repolarized that ____ ____ ________ will cause cells to depolarize leading to _______ ___________
    • Any weak stimulus
    • lethal arrhythmias
  18. Under normal circumstances, depolarization is followed by what?
    Contraction
  19. Repolarization is the resting state in which the ventricles do what?
    fill with blood
  20. The ventricles need enough relaxation time in order for them to do what?
    adequately fill before the next depolarization
  21. How do you treat a slow heart rate?
    Epinephrine
  22. What is the conduction pathway?
    • SA node
    • Internodal tracts
    • AV node
    • Bundle of His
    • Bundle branches
    • Purkinje fibers
  23. What is the pacemaker of the heart?
    SA node (Sinoatrial node)
  24. The SA node has how many beats/min?
    60-100
  25. The AV node has how many beats/min?
    40-60
  26. What are the functions of the AV node?
    • Delays impulses into the ventricle
    • The back up pacemaker
  27. The bundle of His divides into what ?
    The right bundle & left bundle
  28. The left bundle divides into what?
    Anterior fascicle and posterior fascicle
  29. How many beats/min in the purkinje fibers?
    15-40 bpm
  30. What does the P wave represent?
    Atrial depolarization
  31. What is the normal measurement of a PR interval?
    0.12 - 0.20
  32. What is the normal measurement of a QRS interval?
    0.04 - 0.10
  33. What does the QRS complex represent?
    Ventricular depolarization
  34. What does the T wave represent?
    Ventricular repolarization
  35. A T wave inversion indicates what?
    Myocardial ischemia
  36. Changes in the ST segment indicates what?
    Myocardial injury or ischemia
  37. An elevated ST segment indicates what?
    Myocardial injury, the action phase. The patient is having a heart attack
  38. What are the steps to interpret an ECG?
    • Determine regularity
    • Determine heart rate
    • Identify and examine the P waves
    • Measure PR interval
    • Measure QRS complex
    • Name the rhythm
  39. What is an abnormal cardiac rhythm
    Dysrhythmia
  40. What has an impact on the body's ability to maintain a normal hemodynamic status and adequate cardiac output?
    dysrhythmia
  41. What does a significant Q wave indicate?
    MI
  42. Q wave
    first negative deflection
  43. R wave
    first positive deflections
  44. S wave
    negative deflection after R wave

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