ECG p.74-92

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Author:
PopeJim
ID:
270781
Filename:
ECG p.74-92
Updated:
2014-04-16 17:57:51
Tags:
ECG 74 92
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Description:
Coronary circulation, heart sounds, cardiac cycle, cardiac electrical information
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  1. contraction 2 things
    • depolarization
    • systole
  2. rest/relaxation 2 things
    • repolarization
    • diastole
  3. decrease in oxygen due to decreased blood flow - 2
    • ischemia or
    • oxygen debt/lack
  4. intense chest pain - 2
    • brief ischemia
    • aka angina
  5. myocardial infarction (MI) - 2
    • severe ischemia
    • heart dies from hypoxia (no oxygen)
  6. heart's 1st sound (lub) - 2 things
    • ventricular contraction/depolarization/systole
    • tricuspid & bicuspid valves closing
    • afterload=squeeze=resistance to ejecting blood
  7. heart's 2nd sound - 2
    • ventricular relaxation/repolarization/diastole
    • pulmonic & aortic valves closing
    • preload=stretch=volume returning to the heart
  8. volume of blood pumped out of 1 ventricle in a single beat/contraction
    stroke volume
  9. amount of blood pumped by the left ventricle in 1 minute
    cardiac output
  10. pressure in the ventricles at the end of a diastole
    • preload
    • end-diastolic pressure
  11. resistance against which the heart much pump
    afterload
  12. 2 things determine peripheral vascular resistance (PVR)
    • vasoconstriction
    • vasodilation
  13. involuntary
    not under conscious control
    autonomic nervous system (ANS)
  14. physical activity
    fight or flight
    innervates blood vessels
    sympathetic nervous system (SNS)
  15. rest and digest
    parasympathetic nervous system (PNS)
  16. my responsibility to make sure ____ ____ not used before doing a stress test
    beta-blocker meds
  17. generate the physical contraction of the myocardium
    myocardial working cells
  18. primary functions include both contraction & relaxation
    myocardial working cells
  19. do not contain contractile filaments
    pacemaker cells
  20. control the rate & rhythm of the heart by coordinating regular depolarization
    pacemaker cells
  21. point at which a stimulus will produce a cell response
    threshold
  22. GENERATE own electrical impulses spontaneously w/o external stimulation
    automaticity
  23. RESPOND TO an electrical stimulus
    excitability/irritability
  24. RECEIVE & TRANSMIT an electrical stimulus
    conductivity
  25. SHORTEN & EXTEND in response to an electrical stimulus
    contractility/rhythmicity
  26. mechanical function of the heart
    contractility
  27. major function in cardiac depolarization & repolarization
    • potassium
    • K
  28. K increase in blood
    hyperkalemia
  29. K deficit in blood
    hypokalemia
  30. vital part in depolarization of myocardium
    • sodium
    • Na
  31. Na increase in blood
    hypernatremia
  32. Na deficit in blood
    hyponatremia
  33. important function in myocardial depolarization & myocardial contraction
    • calcium
    • Ca
  34. Ca increase in blood
    hypercalcemia
  35. Ca deficit in blood
    hypocalcemia

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