- Whole bowel irrigation
Whole bowel irrigation (WBI) is a medical process involving the rapid administration of large volumes of an osmotically balanced
polyethylene glycolsolution (GoLYTELY, CoLyte), either orally or via a nasogastric tube, to flush out the entire gastrointestinal tract.
Whole bowel irrigation was originally developed to cleanse the large bowel before
surgeryor colonoscopy.cite journal | author = Hewitt J, Reeve J, Rigby J, Cox A | title = Whole-gut irrigation in preparation for large-bowel surgery | journal = Lancet | volume = 2 | issue = 7825 | pages = 337–40 | year = 1973 | pmid = 4124525 | doi = 10.1016/S0140-6736(73)93189-9] Initially a solution of sodium chloride, potassium chloride, and sodium bicarbonatewas used but this electrolytesolution was shown to be absorbed by the body, sometimes leading to complications. To solve this problem a specialized irrigation fluid was developed consisting mainly of an iso-osmolar solution of polyethylene glycol.cite journal | author = Davis G, Santa Ana C, Morawski S, Fordtran J | title = Development of a lavage solution associated with minimal water and electrolyte absorption or secretion | journal = Gastroenterology | volume = 78 | issue = 5 Pt 1 | pages = 991–5 | year = 1980 | pmid = 7380204] With the polyethylene glycol solution there is negligible fluid or electrolyte absorption and several studies have shown the overall safety of the procedure. Whole bowel irrigation was also suggested as a possible treatment for toxic ingestions. WBI has the effect of mechanically flushing the ingested poisonout of the gastrointestinal tract before it can be absorbed into the body. A study provided evidence that whole bowel irrigation is an effective and safe gastrointestinal decontamination procedure for acute poisoning.cite journal | author = Tenenbein M, Cohen S, Sitar D | title = Whole bowel irrigation as a decontamination procedure after acute drug overdose | journal = Arch Intern Med | volume = 147 | issue = 5 | pages = 905–7 | year = 1987 | pmid = 3579442 | doi = 10.1001/archinte.147.5.905]
Whole bowel irrigation is undertaken either by having the patient drink the solution or a
nasogastric tubeis inserted and the solution is delivered down the tube into the stomach. The solution is administered at a rate of 500 mL/h in children 9 months to 6 years, 1000 mL/h in children 6 to 12 years, and 1500 to 2000 mL/h in adolescents and adults.cite journal | author = | title = Position paper: whole bowel irrigation | journal = J Toxicol Clin Toxicol | volume = 42 | issue = 6 | pages = 843–54 | year = 2004 | pmid = 15533024| doi = 10.1081/CLT-200035932] The patient is usually seated on a toilet and the procedure continues until the rectaleffluent is clear. The entire procedure usually takes 4 to 6 hours.cite journal | author = Tenenbein M | title = Whole bowel irrigation as a gastrointestinal decontamination procedure after acute poisoning | journal = Med Toxicol Adverse Drug Exp | volume = 3 | issue = 2 | pages = 77–84 | year = | pmid = 3287090] Often patients vomit(especially if ipecac was given prior to the procedure or following ingestion of a drug that produces vomiting such as aspirinor theophylline), indicating that the rate of infusion may need to be slowed or an antiemeticsuch as metoclopramidegiven.
Whole bowel irrigation is indicated prior to surgery, colonoscopy, or a
barium enemato cleanse the bowel. Whole bowel irrigation is not used routinely in poisoning situations. It is usually reserved for patients who have ingested toxic doses of medications not absorbed by activated charcoal(such as ironand lithium), potentially toxic ingestions of sustained-release or enteric-coated drugs, or in the situation of packaged drug ingestion (body packing/stuffing).
Major gastrointestinal dysfunction precludes the use of whole bowel irrigation. WBI is specifically contraindicated in the presence of
ileus, significant gastrointestinal hemorrhage, hemodynamic instability, uncontrollable intractable vomiting, bowel obstruction, bowel perforation, and in patients with a decreased level of consciousness with a compromised unprotected airway.
Minor complications include
nausea, vomiting, abdominal cramps, and bloating.cite journal | author = Ernstoff J, Howard D, Marshall J, Jumshyd A, McCullough A | title = A randomized blinded clinical trial of a rapid colonic lavage solution (Golytely) compared with standard preparation for colonoscopy and barium enema | journal = Gastroenterology | volume = 84 | issue = 6 | pages = 1512–16 | year = 1983 | pmid = 6341159] Patients with altered mental status or a compromised and unprotected airway are at risk for pulmonary aspiration.
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