Grommet / Tympanostomy tube / Ventilation tube
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🦻 Ventilation tubes / Grommet / Tympanostomy tubes
🔩 What is a Ventilation Tube?
A ventilation tube is a small hollow prosthetic tube, open at both ends, inserted through a surgically created myringotomy in the tympanic membrane.
📌 Synonyms
- Grommet
- Tympanostomy tube
- Pressure Equalizing (PE) tube
➡️ It substitutes the pressure-equalizing function of the Eustachian tube.
What is the Purpose of Ventilation Tubes?
🧪 Materials Used in Ventilation tubes
Commonly used materials:
- Teflon (most common)
- Silastic (silicone)
- Stainless steel
- Titanium
- Gold
- Polyethylene (less preferred)
🧬 Newer Tubes
- Bioabsorbable / bacteriostatic grommets
- Made of polylactic acid
What coating is given to ventilation tubes to avoid biofilm formation?
⭐ Features of an Ideal Ventilation Tube
-
Biocompatibility
-
Chemical Stability
-
Mechanical Strength
-
Non adhesive Surface
-
Adequate Ventilation
-
Sterilizability
Explain each of the features of an Ideal Ventilation Tube.
🔄 Types of Ventilation Tubes
Based on duration of retention, ventilation tubes are classified into:
- Short term grommets
- Long term grommets
⏳ Short Term Grommets
📌 Duration
- Retained for 6-12 months
- Spontaneous extrusion
- No manual removal required
What are the Indications of using Short term grommet?
📌 Materials
- Teflon
- Silicone
- Polyethylene
📌 Features
- Small and lightweight
- Easily extruded by epithelial migration
- Low risk of persistent perforation
Give examples of Short Term Grommets, and describe each one of them.
🕰️ Long Term Grommets
📌 Duration
- Retained for 12–24 months or longer
- Often require manual removal
What are the Indications of using Long term grommet?
📌 Materials
- Silicone
- Teflon
- Titanium
📌 Features
- Larger lumen (better long term patency)
- Wider inner flange (prevents extrusion)
- Higher risk of permanent TM perforation
Give examples of Long Term Grommets, and describe each one of them.
✅ Indications of Grommet Insertion
- Otitis Media with Effusion (OME) – Primary Indication
What are the indications of Myringotomy and Grommet Insertion in Otitis Media with Effusion (OME)?
- Recurrent Acute Otitis Media
What is Recurrent Acute Otitis Media?
📘 In my detailed notes, I’ve discussed an exhaustive list of Intraindications of Myringotomy and Grommet Insertion.
🚫 Contraindications of Grommet Insertion
❗ Absolute Contraindications
- Only hearing ear
- Intra tympanic glomus tumor
⚠️ Relative Contraindications
- Acute otitis externa
- Atrophic tympanic membrane
📘 In my detailed notes, I’ve discussed an exhaustive list of Absolute and Relative Contraindications of Myringotomy and Grommet Insertion.
⚠️ Complications of Grommet Insertion
🛠️ Intra operative
- Bleeding
- Tube displacement into middle ear
- Ossicular injury
⏱️ Early Post operative
- Otorrhea (most common)
🕰️ Late Post operative
- Persistent TM perforation
📘 In my detailed notes, I’ve discussed an exhaustive list of Complications of Grommet Insertion.
📌 Viva Pearls
- Most common tube: Shepherd grommet
- Type B tympanogram in OME
- Posteriorsuperior quadrant is avoided
- Long-term tubes ↑ risk of permanent perforation
- Unilateral OME in adults → rule out NPC
📝 All topics and questions from this post are explained in detail in my Premium ENT Notes, which are designed for clinical understanding and exam success.
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