SFOS 23

Card Set Information

Author:
zf2010
ID:
80247
Filename:
SFOS 23
Updated:
2011-04-17 20:35:03
Tags:
Pulmonary Circulation
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Description:
SFOS 23
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  1. Normal pulmonary arterial pressures
    • Systolic - 25 mmHg
    • Diastolic - 10 mmHg
  2. What is pulmonary wedge pressure?
    Estimate of left atrial pressure
  3. Where is majority of pulmonary resistance?
    Venous flow
  4. Gravity and pulmonary flow
    Flow through top portion of lung only during systole when pressure is high enough
  5. Alveolar pressure vs pulmonary arterial pressure
    No flow if alveolar P always greater than pulmonary arterial pressure
  6. Methods of increased pulmonary function
    • Recruitment of closed capillaries
    • Distention of open capillaries
    • Elevate pulmonary arterial pressure to increase flow
  7. Atelectasis
    • Collapse of lung tissue
    • Results in blood vessel collapse
  8. Hyperexpansion
    • Hyperexpanded alveoli crush capillaries
    • Increase pulmonary resistance
  9. Segmental hypoxia
    • If gas in lungs has low O2 levels, blood vessels constrict
    • Directs blood to well-oxygenated regions
  10. Diffuse hypoxia
    • Vasocontriction of whole lung in hypoxic environment (high altitude)
    • Results in pulmonary hypertension
  11. In-utero hypoxia
    • Keeps lungs contricted, limiting flow
    • Release at birth

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