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Normal pulmonary arterial pressures
- Systolic - 25 mmHg
- Diastolic - 10 mmHg
What is pulmonary wedge pressure?
Estimate of left atrial pressure
Where is majority of pulmonary resistance?
Gravity and pulmonary flow
Flow through top portion of lung only during systole when pressure is high enough
Alveolar pressure vs pulmonary arterial pressure
No flow if alveolar P always greater than pulmonary arterial pressure
Methods of increased pulmonary function
- Recruitment of closed capillaries
- Distention of open capillaries
- Elevate pulmonary arterial pressure to increase flow
- Collapse of lung tissue
- Results in blood vessel collapse
- Hyperexpanded alveoli crush capillaries
- Increase pulmonary resistance
- If gas in lungs has low O2 levels, blood vessels constrict
- Directs blood to well-oxygenated regions
- Vasocontriction of whole lung in hypoxic environment (high altitude)
- Results in pulmonary hypertension
- Keeps lungs contricted, limiting flow
- Release at birth
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