A 68-year-old man comes to the physician for a 4-day history of pain with urination. He has history of depression and takes amitriptyline. Physical examination demonstrates a suprapubic mass. Serum creatinine is 1.6 mg/dL. Which of the following is the most likely explanation for this patient’s creatinine?
Decreased interstitial hydrostatic pressure
Decreased interstitial oncotic pressure
Decreased tubular hydrostatic pressure
Decreased tubular oncotic pressure
Increased interstitial hydrostatic pressure
Increased interstitial oncotic pressure
Increased tubular hydrostatic pressure
Increased tubular oncotic pressure
