Flood Stage. 1  The term stage refers to the height of a river (or any other body of water) above a locally defined elevation. This locally defined elevation is a reference level, often referred to as datum. 2  When the discharge of a river increases, the channel may become completely full.
vasoconstrictor (vÄÂ´zÅkÉnstrikÂ´tur) , n (vasopressor), an agent that causes a rise in blood pressure by constricting the blood vessels. In local areas, it causes constriction of the arterioles and capillaries. Vasoconstrictor agents. 2  vasoconstrictor center. 3  vasoconstrictor center. 4  vasoconstrictor center. 5  vasoconstrictor center. 6  vasoconstrictor fibers. 7  vasoconstrictor fibers. 8  vasoconstrictor fibers. 9  vasoconstrictor nerve. 10  vasoconstrictor nerve.
This happens when one or more of the blood vessels in the hand or wrist become blocked. There are many diseases of blood vessels that can cause vasoconstriction and vaso-occlusion. One of the most common is Raynaud's Disease, during which there is an abnormal reaction in the hand when it is exposed to cold.