Nasogastric Tube (NG Tube) Procedure

An NG tube is a flexible tube inserted through the nose into the stomach for feeding, medication administration, or draining stomach contents. Here is a detailed guide on the procedure:

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Indications for NG Tube Insertion

• Feeding (enteral nutrition) for patients unable to swallow.
• Administration of medications or fluids.
• Decompression of the stomach (e.g., in bowel obstruction).
• Removal of stomach contents (e.g., in poisoning or gastric lavage).

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Preparation for NG Tube Insertion

1. Equipment Needed:

• NG tube (appropriate size for the patient, usually 8-16 Fr for adults).
• Lubricant (water-soluble, e.g., KY Jelly).
• Gloves and apron.
• A cup of water with a straw (if the patient can swallow).
• Syringe (50 mL or larger) for aspiration.
• pH indicator strips (to confirm placement).
• Adhesive tape or securement device.
• Suction apparatus (if needed).
• Towel or basin (to manage secretions).

2. Patient Preparation:

• Explain the procedure and its purpose to the patient.
• Obtain consent if appropriate.
• Ensure the patient is sitting upright at a 45-90° angle to facilitate insertion.
• Place a towel or disposable pad over the chest to protect clothing.

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Steps for NG Tube Insertion

1. Measure and Prepare the Tube:

1. Estimate the length of the tube:
   • Measure from the tip of the patient’s nose to the earlobe and then to the xiphoid process (bottom of the sternum).
   • Mark the measured length on the tube with tape or a marker.
2. Lubricate the first 4-6 inches of the tube with a water-soluble lubricant.

2. Insert the Tube:

1. Ask the patient to tilt their head slightly forward (this closes the airway and opens the esophagus).
2. Insert the tube gently into one nostril.
3. Advance the tube slowly along the nasal floor, aiming downward and backward.
4. If resistance is met, withdraw slightly and try a different angle. Do not force the tube.
5. Once the tube reaches the oropharynx, the patient may gag or cough.
   • Encourage them to take small sips of water and swallow, which helps guide the tube into the esophagus.
6. Advance the tube to the pre-measured mark.

3. Confirm Placement:

1. Check for proper placement using one or more of the following methods:
   • Aspirate stomach contents using a syringe and test the pH (gastric contents should have a pH of 1-5).
   • Auscultation method: Inject air (20-30 mL) into the tube while listening over the stomach with a stethoscope for a “whooshing” sound.
   • Chest X-ray: The gold standard for confirmation.
2. If placement is confirmed, secure the tube with adhesive tape or a securement device.

4. Secure and Connect the Tube:

• Tape the tube to the nose to prevent movement.
• Connect the tube to the appropriate device (e.g., feeding pump, drainage bag, or syringe for feeding/medication).

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Post-Procedure Care

1. Ensure the tube is functioning properly by checking for:
   • Patency (flush with water if necessary).
   • Proper position regularly (before each use).
2. Monitor the patient for:
   • Nausea, vomiting, or abdominal distension.
   • Signs of aspiration (e.g., coughing, respiratory distress).
3. Keep the tube site clean and dry to prevent irritation or infection.
4. Document the procedure, including:
   • Date and time of insertion.
   • Tube size and type.
   • Confirmation method used.
   • Patient tolerance and any complications.

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Complications

• Nasal irritation or ulceration.
• Aspiration pneumonia if the tube is misplaced into the lungs.
• Epistaxis (nosebleed).
• Discomfort or gagging.
• Perforation of the esophagus (rare).