In trying to determine the cause of the cardiac arrest I would be interested in what monitoring took place post discharge. In particular what were the labs at the follow up and preprocedure, what was the patients volume status. Also, trends in labs and clinical status around time of discharge may provide clues as to why she had the cardiac arrest. Role of comorbidities, medications and peri-endoscopy events will also be relevant. I manage patients with AKI and ATN very frequently. When covering inpatients these types of patients are very common and we see several daily. Treatment depends somewhat on the underlying cause. First would be to treat underlying disorder. Then avoid further insults. Ultimately we monitor for recovery in this context – monitoring patient volume status, mental status, urine output, creatinine and electrolytes. The patient may need supportive therapy with diuretics or dialysis if severe acute kidney injury. At a minimum a basic or comprehensive metabolic panel to assess BUN/creatinine, potassium, bicarbonate. Imaging may not be necessary.