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As blood volume is lost the body tends to compensate by narrowing the blood vessels causing an increase in blood pressure. This change is not noticeable via a BP cuff due to lack of blood volume to sustain adequate pressure. The heart also begins to beat faster. This is known as shock. Shock is looked at with 3 essential problems. Pipes (Blood vessels; Ruptured, torn, etc.), Pump (Heart; contusions, heart attacks, insufficient sinus rhythms, disrhythmias, etc) Or a volume problem in this case. (Loss of fluid) Extended shock leads to the failure of several bodily organs. After 2-3 hours of hypovolemic shock, no matter how much blood or drugs you put back into the body, death is certain. Hope this gave you a good idea of the mechanics of shock.

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