Types of ryles tube where it can be used
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Here is a thorough overview of Ryle's tube - its types/sizes and where it can be used.
What is a Ryle's Tube?
A Ryle's tube (also called a nasogastric or NG tube) is a flexible, hollow plastic tube named after British physician John Ryle. It is passed through the nose, down the nasopharynx, through the esophagus, and into the stomach. It can be used to deliver substances to the stomach or remove contents from it.
Types / Sizes of Ryle's Tube
Ryle's tubes are sized using the French (Fr) scale, where 1 Fr = 0.33 mm in outer diameter. Each size is color-coded at the connector for quick identification.
| Size (Fr) | Color Code | Outer Diameter | Primary Use |
|---|---|---|---|
| 6-8 Fr | Blue | 2.0-2.67 mm | Neonates / small infants |
| 10 Fr | Black | 3.33 mm | Pediatric / geriatric nutritional support |
| 12 Fr | White | 4.00 mm | Children / thin liquids / medication delivery |
| 14 Fr | Green | 4.67 mm | Standard adult feeding and maintenance |
| 16 Fr | Orange | 5.33 mm | Gastric decompression / post-operative use |
| 18 Fr | Red | 6.00 mm | Trauma lavage / high-volume aspiration |
General size guidance:
- Adults: 14-18 Fr (most commonly 16 Fr for drainage, 14 Fr for feeding)
- Pediatric patients: size varies with age and weight (formula-based selection)
- Neonates: 6-8 Fr
Indications / Where It Can Be Used
1. Drainage Purposes (Decompression)
- Postoperative paralytic ileus - conservative management
- Bowel obstruction (adhesional or partial) - gastric drainage to relieve distension
- Pre-operative gastric decompression before emergency surgery
- Prophylactic decompression when postoperative ileus is anticipated after extensive bowel handling
- Acute pancreatitis - gastric rest and decompression
- Upper GI bleeding - to assess volume of blood loss and monitor ongoing bleeding
- Acute abdomen - to decompress and reduce vomiting risk
2. Feeding / Enteral Nutrition Purposes
- Patients who cannot swallow (dysphagia) - e.g., after stroke or motor neurone disease
- Head and neck surgery / upper aerodigestive tract procedures
- Unconscious or intubated patients in the ICU
- Neurological conditions with impaired swallowing (TBI, Parkinson's disease)
- Esophageal disorders where oral feeding is temporarily unsafe
- Premature neonates who cannot suck
3. Medication Administration
- Delivering drugs (including crushed tablets, liquid medications) when the oral route is unavailable
- Activated charcoal administration in poisoning
4. Gastric Lavage
- Poisoning / drug overdose - to wash out ingested toxins (only when indicated and airway is protected)
- Gastric bleeding - irrigation with cold saline (though now less common)
5. Diagnostic Purposes
- Gastric acid analysis - sampling gastric secretions
- Diagnosis of upper GI bleeding - aspirate to confirm origin
- Checking residual gastric volumes in tube-fed patients
Contraindications (When NOT to Use)
- Suspected base of skull fracture - risk of intracranial tube passage
- Esophageal stricture or recent esophageal surgery (unless done under direct vision)
- Severe nasal obstruction or facial trauma
- Coagulopathy (relative contraindication)
Key Complications
- Pressure necrosis of the nasal ala (from oversized tube or prolonged use)
- Reflux esophagitis
- Pulmonary aspiration (impaired lower esophageal sphincter function)
- Inadvertent tracheal/pulmonary placement (potentially fatal if feeds given)
- Traumatic insertion causing bleeding or esophageal perforation
Clinical note: The position of a Ryle's tube must always be confirmed before use - typically by pH testing of aspirate (pH ≤5.5 suggests gastric placement), chest X-ray, or auscultation (though auscultation alone is unreliable). ERAS (Enhanced Recovery After Surgery) protocols now discourage routine prophylactic NG tube placement in elective abdominal surgery.
Sources: - Bailey and Love's Short Practice of Surgery, 28th Ed., pp. 136-137; MedikaB azaar - Ryle's Tube Uses; MeddeyGo Ryle Tube Guide
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