Preoperative Investigation Preparation for the Procedure

History:

Laboratory tests: Radiology: CT scan: Endoscopy:

Persistent vomiting

Electrolytes, albumin, coagulation parameters

Upper GI contrast study

Assessment of primary disease/condition

Assessment of gastric outlet obstruction, periampullary biopsy for tissue diagnosis

A large-bore nasogastric tube is placed the day prior to the operation for gastric decompression and irrigation.

The patient's water and electrolyte balance are corrected preoperatively.

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