Hypovolemic shock happens as a result of a reduction in intravascular fluids. This reduction of the intravascular fluid volume promotes a decrease in stroke volume which causes hypovolemic shock can have many causes including dehydration from vomiting and diarrhea, hemorrhage, and decreased intake of fluids, systaltic blood pressure of less than 90mm Hg.
A drop in the systolic blood pressure is an indication that the shock state deteriorated from a compensatory stage to a progressive stage — a decrease in cardiac output, which is revealed by falling systolic blood pressure.
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