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I'm not sure what the mechanism is, but the nurse is only partially right. An increase in pCO2 causes vasoconstriction in the pulmonary vasculature and vasodilation EVERYWHERE else. CO2 causes constriction in the pulmonary vasculature because an increase in pC02 sends the message there is damage/shunting here, sending blood here will not effectively oxygenate it so blood is preferentially sent to a different part of the lung where it will receive better oxygenation.
by admin Leave a Comment. Vasoconstriction is the process of constriction of blood vessels, which may result in decrease of flow of blood. Normal blood flow is necessary for carrying oxygenated blood to all parts of the body and when the normal flow is disrupted it may cause various problems. Vasoconstriction can occur due to medical condition or due to psychological disorder. This condition happens when the small muscles of the walls constrict causing narrowing of blood vessels. Actually this process is exactly opposite condition of vaso-dilation in which the blood vessels enlarge or open widely.