Following a MVC with prolonged entrapment of the legs, a 7-year-old has:BP: 75/40HR: 145K⁺: 5.

This is consistent withrhabdomyolysis, which causesmuscle breakdown and release of myoglobininto the bloodstream.Myoglobinuriaresults indark red-brown or "tea-colored" urine, and is nephrotoxic, contributing to acute kidney injury.

“Crush injuries and elevated CK levels are hallmarks of rhabdomyolysis. Myoglobinuria presents as dark, tea-colored urine, and requires prompt fluid management to prevent renal damage.”

(Referenced from CCRN Pediatric – Direct Care: Renal, Electrolyte Imbalances and Rhabdomyolysis)