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| | THE MERCK MANUAL, Sec. 14, Ch. 167, Pain |
 | | Acute pain, an essential biologic signal of the potential for or the extent of injury, is pain that lasts or is anticipated to last a short time, typically < 1 mo. It is often associated with anxiety and with hyperactivity of the sympathetic nervous system (eg, tachycardia, increased respiratory rate and BP, diaphoresis, dilated pupils). |
 | | Chronic pain is usually defined broadly and arbitrarily as pain persisting > 1 mo beyond the resolution of an acute tissue injury, pain persisting or recurring for > 3 mo, or pain associated with tissue injury that is expected to continue or progress. |
 | | Similarly, pain and suffering should be distinguished, especially in a cancer patient, whose suffering may be due as much to loss of function and fear of impending death as to pain. |
| www.merck.com /pubs/mmanual/section14/chapter167/167a.htm (2620 words) |
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