Grades of atelectasis of ear and its management
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Sade classification grades atelectasis ear tympanic membrane management
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Atelectasis of the Ear - Grades and Management
Atelectasis of the ear (middle ear atelectasis) refers to retraction of the tympanic membrane into the middle ear space due to longstanding eustachian tube dysfunction. Negative middle ear pressure causes the tympanic membrane to progressively collapse onto middle ear structures. It is distinct from adhesive otitis media, where the membrane becomes adherent to the medial wall.
Pathophysiology
Eustachian tube dysfunction prevents ventilation of the middle ear. The middle ear mucosa absorbs nitrogen, causing progressive negative pressure. This, combined with weakening of the fibrous layer of the tympanic membrane (especially in the posterosuperior pars tensa and pars flaccida), leads to retraction. Inflammation, recurrent AOM, and infection further damage collagen in the lamina propria, accelerating retraction. - Shambaugh Surgery of the Ear
Classification: Sadé and Berco (1976) / Tos System
The most widely used classification is the Sadé staging system (also described by Tos), which has 4 stages:
Fig. 140.3 - The four stages of middle ear atelectasis (Cummings Otolaryngology)
| Grade | Description |
|---|---|
| Grade I | Simple retraction of the tympanic membrane - shallow, nonadherent; membrane retracted over the annulus |
| Grade II | Retraction with contact onto the long process of the incus and/or stapes, with or without ossicular erosion |
| Grade III | Middle ear atelectasis - membrane retracted to the promontory but not adherent; middle ear space partially or completely obliterated but mucosal lining is intact |
| Grade IV | Adhesive otitis media - membrane adherent to the promontory; middle ear space totally obliterated; mucosal surfaces of TM and middle ear lining lost |
Key distinction: In atelectasis (Grade III), the TM is not adherent and the mucosal lining is intact. In adhesive otitis media (Grade IV), the TM is adherent to ossicles and promontory, and mucosal surfaces are lost. - Cummings Otolaryngology, p. 2682-2683
Clinical Features
- Conductive hearing loss (up to 25 dB in most cases; up to 40-50 dB if the TM invaginates into the round window niche)
- Risk of cholesteatoma development from deep retraction pockets
- Ossicular erosion (especially long process of incus and stapes superstructure)
- "Trail sign" - a line of keratin from the pocket along the posterior EAC wall (suggests cholesteatoma)
Red flags requiring urgent assessment: deep pockets with invisible medial extent, conductive hearing loss, recurrent otorrhea, polypoid tissue, crusts or cerumen covering a pocket - Shambaugh Surgery of the Ear
Management
Management is based on grade severity:
Grade I - Observation / Conservative
- Regular microscopic ear examination to confirm stability
- Shallow pockets cleaned of debris and cerumen
- Acetic acid drops, mineral oil, or other lubricating/cleansing agents to reduce debris accumulation
- Manage contributing factors: allergy, adenoid hypertrophy, gastroesophageal reflux
- Encourage autoinflation (Valsalva or Otovent)
- Eustachian tube function support
Grade II - Medical + Possible Tympanostomy Tube
- All conservative measures above
- Ventilating tube (tympanostomy tube) insertion to re-establish middle ear ventilation and allow the retracted membrane to return toward its normal position
- Note: thinning of the lamina propria can make tube retention tenuous with early extrusion
- Laser myringotomy has been advocated as an alternative to grommet insertion
Grade III - Surgery
- Tympanostomy tube insertion as primary intervention
- If hearing loss or ossicular erosion is present: myringoplasty (reinforcement of the atelectatic TM)
- Cartilage tympanoplasty - cartilage grafts are more resistant to re-retraction
- Laser-assisted contraction myringoplasty (Ostrowski and Bojrab technique) - addresses redundant and weakened TM
Grade IV (Adhesive Otitis Media) - Surgical
- Tympanoplasty with or without mastoidectomy
- Ossicular chain reconstruction if erosion has occurred
- Postoperative recurrence is not uncommon with any technique
- If cholesteatoma has developed: appropriate cholesteatoma surgery (canal wall up or canal wall down mastoidectomy)
Summary Table
| Grade | Appearance | Management |
|---|---|---|
| I | Simple retraction, nonadherent | Observation, cleaning, autoinflation, treat ETD |
| II | Touches incus/stapes ± erosion | Above + ventilating tube / laser myringotomy |
| III | Retracted to promontory, nonadherent | Tympanostomy tube + myringoplasty/cartilage TMP if symptomatic |
| IV | Adherent to promontory (adhesive OM) | Tympanoplasty ± mastoidectomy, ossiculoplasty |
Sources:
- Cummings Otolaryngology Head and Neck Surgery (Sadé & Berco staging, p. 2682-2683)
- Shambaugh Surgery of the Ear (Sadé grading description and management, retraction pocket section)
- Scott-Brown's Otorhinolaryngology Head & Neck Surgery Vol 2 (COM classification)
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