Your 68 yr old patient lives alone.  5 days ago, he develope…

Your 68 yr old patient lives alone.  5 days ago, he developed a fever & began vomiting.  Today, his neighbor finds him weak and feverish, and brings him to the ER. His B/P is 78/60 & his U/O is 15ml after straight cath.  His BUN is 72mg/dl & Creat is 1.6mg/dl-. What is the cause of his AKI?