One Pearl from the author, laparotomy patients may have received a bowel prep for a colonoscopy a couple of days before surgery, which also required a bowel prep. This means that the patient may be inordinately hypovolemic and have electrolyte disorders before going to surgery. The converse is true in the HIPEC; they usually receive intravenous fluids at a high rate intra-operative and the author has seen a 24-hour fluid output of 10,000 on the first post-operative day.