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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Hypovolemic shock is a condition in which the heart canât pump enough blood to the body because of severe blood loss. In vasodilatory shock, the blood vessels suddenly relax. When the blood vessels are too relaxed, blood pressure drops and blood flow becomes very low.hen a person is in shock (from any cause), not enough blood and oxygen are reaching the body's organs. If shock lasts more than a few minutes, the lack of oxygen starts to damage the bodyâs organs.