An elderly patient with a history of congestive heart failure developed a perforated peptic ulcer. He was taken to the operating room after the administration of 500 ml of 5% glucose over 6 hours. Upon induction of anesthesia, the BP dropped to 80 mmHg.

What is the most probable diagnosis? *This case is from the Docplexus Editorial Team for educative purposes only. (Answer is posted in the comment section below!)