system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A patient comes with hematemesis and melena. On the upper GI endoscopy, there were no significant findings. 2-days later the patient rebleeds. Next line of investigation is
assistant
The correct answer is  In case of intermittent upper GI bleeding for which no source has been found endoscopically or radiologically, laparotomy is done to see any missed common cause or angiodysplasia or for any obscure causes. SRB edition 5th page no .992