Flashcards in 14. Pulmonary vascular resistance Deck (10):
pulmonary vascular resitance
pulmonary vascular resistance ( PVR) - equation
( Ppulm arter - Pleft atrium )/ cardiac output
resistance - equation
(8 x viscosity x vessel length) / πr4
pulmonary circulation resistance - low or high
pulmonary circulation - compliance - low or high
• How is pulmonary vascular resistance calculated?
PVR = pressure in the pulmonary artery - pressure in the left atrium)/cardiac output
• How is left atrial pressure measured?
It is approximated by pulmonary wedge pressure
• How do you measure pulmonary vascular resistance using flow and the difference in pressure across it?
R = ΔP/Q, where R is resistance, P is pressure, Q is flow
• Pulmonary vascular resistance is ____ (directly/inversely) related to vessel length and ____ (directly/inversely) related to vessel radius.
Directly; inversely—R = (8ηl)/(πr4), where η = viscosity of blood, l = vessel length, and r = vessel radius