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Response to injury in children with closed femur fractures.

Fifty children admitted with closed femur fracture as a single major injury were monitored for change in vital signs and hematocrit. Hypotension was not observed. No child required blood replacement. Only 33% of the children had a measurable change in hematocrit, averaging a four-point drop. There was a marked febrile response to injury in 80% of the children which lasted an average of 4 days. Children admitted with femur fractures who develop hypotension or rapid drop in hematocrit should be promptly evaluated for another source of blood loss.