mrcem2-0583

mrcem2-0583

A 40-year-old male patient presents with a history of dizziness and fainting episodes. He has also been suffering from a mild flu-like illness for the past few days. He had a syncopal episode in the department and was moved into the resuscitation area. His observations are as follows: Temperature 38.4°C, HR 112, BP 78/44, oxygen saturation 98% on high-flow oxygen, GCS 14/15, BM 1.5.

His initial blood results are shown below:
Na+: 118 mmol/l
K+: 6.1 mmol/l
Urea: 11.6 mmol/l
Creatinine: 132 mmol/l

What is the SINGLE most likely diagnosis?