A 55-year-old male patient is admitted with a massive GI bleed. The patient is at risk for what type of acute kidney injury?

A. Post-renal: Post-renal acute kidney injury occurs due to obstruction of urine flow in the urinary tract, such as from kidney stones or prostatic hypertrophy. A massive GI bleed does not directly cause urinary tract obstruction. B. Intra-renal: Intra-renal injury refers to direct damage to kidney tissue from toxins, medications, or ischemia. While ischemia can occur, the primary risk from a massive GI bleed is systemic hypoperfusion rather than direct renal tissue injury. C. Pre-renal: Pre-renal acute kidney injury results from decreased renal perfusion due to hypovolemia, hypotension, or shock. A massive GI bleed can cause significant blood loss and hypovolemia, reducing kidney perfusion and placing the patient at risk for pre-renal AKI. D. Intrinsic renal: Intrinsic renal injury involves structural damage within the kidney, such as glomerulonephritis or acute tubular necrosis. Initial risk from a GI bleed is hemodynamic, making pre-renal injury more likely than primary intrinsic renal damage.