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“There is evidence to indicate, however, that SNP inhibits hypoxic vasoconstriction and may increase intrapulmonary shunt fraction ( Qs/QT ) (1,2), responses which could be particularly deleterious in patients with limited cardiopulmonary reserve.”
Journal of applied physiology: respiratory, environmental and exercise physiology • 1984 | View Paper
“The decrease in PVR in the atelectatic lung suggests that SNP decreases PaO2 and increases Qs/Qt by reversing the hypoxic pulmonary vasoconstriction.”