central venous pressure

Card Set Information

central venous pressure
2014-07-15 21:47:27
cv physiology
cv physiology
central venous pressure
Show Answers:

  1. What is venous pressure and volume compared to arteries?
    • venous pressure is low
    • but high volume compared to arteries
  2. What does venous pressure represent?
    the average blood pressure within the venous compartment
  3. What is the definition of central venous pressure?
    • describes the pressure in the thoracic vena cava near the right atrium.
    • (therefore CVP and right atrial pressure are essentially the same)
  4. What is the change in CVP is determined by...
    the change in volume of blood within the thoracic veins divided by compliance.
  5. What is the formula for CVP?
    CVP = change in volume / compliance
  6. Why is the Central Venous Pressure important in cardiology?
    It represents the filling pressure of the right heart and determines the stroke volume.
  7. What are 5 factors that influence central venous pressure?

    • CO
    • RA
    • CSM
    • SVT
    • GF
  8. What are 5 factors that influence central venous pressure?

    • Cardiac output
    • Respiratory activity
    • Contraction or skeletal muslces
    • Sympathetic vasocontrictor tone
    • Gravitational forces

    What is the formula for compliance?
    compliance = change in volume / change of pressure
  10. REVIEW

    What is compliance?
    the ability of a blood vessel to expand and contract passively with changes in pressure is an important function of arteries and veins.
  11. Change in pressure varies with...
    • 1.) change in volume
    • 2.) compliance
  12. How does cardiac output influence central venous pressure?
    A decrease in cardiac output will increase the central venous pressure because blood will back up from the left side to the right and all the through the venous circulation.
  13. What three veins are important when discussing central venous pressure?
    SVC, IVC, coronary sinus
  14. The SVC, IVC, coronary sinus...
    DO NOT have valves. Blood will back up into SVC-neck and head, IVC-lower extremities
  15. What are 7 factors that increase central venous pressure?
    • 1.) Decreased cardiac output
    • 2.) Increased blood volume
    • 3.) Venous constriction
    • 4.) Changing from standing to supine body posture.
    • 5.) Forced expiration- Valsalva
    • 6.) Arterial dilation
    • 7.) Muscle contraction(abdominal and limb)
  16. An increase in total blood volume causes what?

    an increase in central venous pressure

    Due to renal failure or activiation of the renin-angiotensin-aldosterone system.
  17. Venous Constriction affects total blood volume how?
    Venous constriction reduces venous compliance and thereby increases the central venous pressure.