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Respiratory- physiology

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drnieves's version from 2017-06-20 21:28

Section

Question Answer
PVRP in pulmonary a- P in L atrium/ CO
R8nl/pi(r)^4
P in L atriumPCWP
PVR is lowest atFunctional residual capacity
Increased lung volumes increase PVRDue to longitudinal stretching of alveolar capillaries by the expanding alveoli.
Decreased lung volumes also increase PVRDue to decreased radial traction from adjacent tissues on the L extra alveolar vessels.
Centre of airway- P curveFRC.
memorize
Airway P= 0. Intrapleural P is -5 cm H2O.
Question Answer
Female erythrocytosis>48%
Male erythrocytosis >52%
Measure this to know if relative or absolute erythrocytosisRBC mass
If normal RBC massplasma V contraction as cause of erythrocytosis.
Agingdecrease in chest wall compliance but increase in lung compliance (lost of elastic recoil).
Mark increase in RV, decreased in FVC, unchanged total lung capacityAging
Emphysemadecreased traction
Pulmonary fibrosisincrease traction
memorize

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