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15 Cards in this Set

  • Front
  • Back
Describe the pulm. circulation.
-Low Pressure,Low resistance,mostly at heart height.
-PAP = 25/8 mmHg
-Capillary pressure = 12-8 mmHg
Pulm. vessels are thin-walled.
Pulm. circulation receives all of the right ventricular output.(5-20 L/min)
Why doesnt pulm. artery pressure rise with increased CO ?
due to dilatation and recruitment of pulm. vessels.
What happens when you lie down?
Blood drains from legs to lungs.(pulm. circulation serves as a reservoir for blood)
Pooling of blood occurs on EXPiration.
False.Pooling occurs on Inspiration.
-Decreased venous return to LA
-Decreased CO
-Decreased systolic BP on inspiration(lower than on exp)
What is regional distribution of blood flow affected by?
1. Gravity
2. Arteriolar constriction in response to alveolar hypoxia
Pulsus paradoxus occurs when the diff. of systolic BP between INSP. and EXP. is > 15 mmHg.
When is gas exchange most efficient?
When ventilation and perfusion are matched(V/Q =1) in all the 300 million AC units.
V/Q matching doesnt really affect CO2.
Can we give 100 % O2 to a shunt?
Giving O2 in case of hypoxemia improve ventilation.
What is the compensatory mechanism for regions of low V/Q ?
Regional vasoconstricition in areas of low alveolar Ventilation to reduce hypoxaemic effects of low V/Q units.
What happens when blood pools down at bottom of lungs?
It has an effect on the negative intrathoracic pressure(highest -ve pressure at top of lungs)----> alveoli at bottom open up on inspiration.
How do you assess overall effectiveness of O2 exchange in lungs?
Alveolar-arterial oxygen gradient.(A-a)---> PA O2 - PaO2.