1. Hypovolaemia
l External fluid loss
l Sequestration of body fluids in the abdomen, chest,or limbs
2. Cardiac
l Pump failure
l Cardiac tamponade
l Dissecting aortic aneurysm
l Arrhythmia
3. Massive pulmonary embolus
4. Sepsis
5. Anaphylaxis
6. Endocrine failure
7. Neuropathic:from drugs,spinal cord injury or autonomic neuropathy
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