change in mean arterial blood pressure to change in the logarithm of the vasoconstrictor dose ratio 2013-12-02T10:53:31Z A calculated measurement in which difference in the mean arterial blood pressure between two or more dosages of a drug or chemical which reduces the interior diameter of blood vessels is divided by difference in the logarithm of the applied dosages and presented as a ratio, fraction, quotient or percentage. The value is calculated as the slope of the curve of the mean arterial blood pressure versus log of the vasoconstrictor dose [VC] graph, given by the equation (log[VC]2 - log[VC]1)/(MAP at [VC]2 - MAP at [VC]1). A logarithm is the power to which a base, such as 10, must be raised to produce a given number. CMO:0001965 JSmith change in MAP to change in log[vasoconstrictor] ratio clinical_measurement_ontology calculated mean arterial blood pressure measurement