A 60-year-old male with a history of benign prostatic hypertrophy presents with complaints of nausea and vomiting. Laboratory values include: Serum Na - 145 mmol/L Blood urea nitrogen (BUN) - 45 mg/dL Creatinine - 2.0 mg/dL Urine Na - 10 mEq/L Urine creatinine - 80 ml/min. What is the most likely diagnosis?

*This patient case is from the Docplexus Editorial Team for educative purposes only. Source: Renal and Urology MCQs (The answer is posted in the comment section below!)