<Tr> <Td> Wonder drugs or "What did we do?" </Td> <Td> Anytime </Td> <Td> drug fever or reaction to blood products, either a febrile non-hemolytic transfusion reaction or transfusion - related acute lung injury </Td> </Tr> <Tr> <Td> Wing / Waterway </Td> <Td> Anytime </Td> <Td> bloodstream infection, phlebitis, or cellulitis related to intravenous lines, either central or peripheral </Td> </Tr> <P> Other important causes of early post-operative fever that are omitted from this list include malignant hyperthermia, a potentially life - threatening but treatable response to inhalational anesthetic and paralytic agents . </P> <P> Early postoperative fever (i.e., within the first 48 hours post-operatively) has often been ascribed to atelectasis, or splinting, but it is most likely part of a natural and non-infectious inflammatory response (with sympathetic nervous system involvement) to the tissue injury sustained during surgery; it generally requires no medical intervention except antipyretics and extra fluid intake . </P>

Fluctuations in the body temperature is most likely to occur from the injury or inflammation to