Extreme physical activity or trauma to the muscle causing red urine, but no red blood cell casts. Dx?
What drug is contraindicated and why?
Myoglobinuria due to muscle breakdown
K+ sparing diuretics are contraindicated in renal failure. Crushed muscles will increase a lot of K+, PO4-, uric acid, and metabolic acidosis. K+ sparing diuretics will exacerbate the hyperkalemia.