Whole Bowel Irrigation (WBI)

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Whole bowel irrigation (WBI) WBI is not routinely used and consideration of use should be discussed with a toxicologist Indications Technique Consider in life-threatening ingestions of: Use an iso-osmotic preparation such as Polyethylene Glycol Electrolyte Solution (PEG-ES) Modified release preparations including: A single dedicated nurse is required for optimal and safe performance of the procedure - Calcium channel blockers (verapamil, diltiazem), venlafaxine Ensure no contraindication to WBI Metals: - Potassium chloride, iron, lead Consider securing airway if drowsy Body packers and body stuffers Insertion of NGT or OGT is usually required even in awake patients (confirm placement via CXR) Large ingestions of drugs not well bound to activated charcoal Administer PEG-ES via the NGT at a rate of up to 1- 2L/hour (children: up to 25 mL/kg/hour) WBI is likely most effective if started within 4 hours of ingestion Elevate head of bed to ensure the patient is in an upright position Contraindications Non-intubated patients must be alert and cooperative and may be seated on commode - Uncooperative or combative patient If intubated – elevate head of bed to 45 degrees - Unprotected airway or the potential for an unprotected airway Administer pro-kinetic antiemetic such as metoclopramide 10-20 mg IV - GI dysfunction – vomiting, ileus (absent bowel sounds) Perform regular abdominal examinations and cease if distention or no bowel sounds - Haemodynamic instability Preparation of macrogol 3350 (PEG-ES) preps for WBI: Therapeutic Endpoint Brand (amount per sachet) Preparation of WBI - Until rectal effluent is clear – may take several hours Movicol (13.7g) 8 sachets in 2 L water - AXR may be useful to assess effectiveness of WBI for radio-opaque substances such as iron or Moviprep (A and B) A plus B sachets in 2 L water potassium salts Glycoprep (200g) 1 sachet in 3 L of water Glycoprep C (70g) 2 sachets in 2 L water Complications ColonLYTELY (68.58g) 2 sachets in 2 L water – Vomiting, aspiration (can pool in oropharynx, even in intubated patients) AUSTIN CLINICAL TOXICOLOGY SERVICE GUIDELINE POISONS INFORMATION CENTRE: 13 11 26 Version 2: Published 8/2020. Review 8/2023 .

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