Grades of atelectasis of ear and its management

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Atelectasis of the Ear (Middle Ear Atelectasis) - Grades and Management

Definition

Middle ear atelectasis refers to retraction of the tympanic membrane (TM) into the middle ear space due to longstanding eustachian tube (ET) dysfunction. Negative middle ear pressure causes the TM to collapse inward onto the ossicles and promontory. It represents a spectrum from simple retraction to full adhesive otitis media.

Key distinction:

Atelectasis: TM retracted onto promontory/ossicles but the middle ear mucosal lining is still intact and the TM is NOT adherent to the medial wall
Adhesive otitis media (Stage IV): Middle ear space totally obliterated, TM adherent to ossicles/promontory, mucosal surfaces lost

Sadé & Berco Classification (1976) - The Standard Grading System

This is the most widely used system, adapted by Cummings Otolaryngology:

Four stages of middle ear atelectasis showing progression from normal to Stage I (Retraction), Stage II (Severe retraction), Stage III (Atelectasis), and Stage IV (Adhesive otitis)

Fig. 140.3 from Cummings Otolaryngology: The four stages of middle ear atelectasis. (Adapted from Sadé J, Berco E, 1976)

Stage	Description	Features
Stage I	Retracted TM	TM retracted but not touching incus; mild inward displacement
Stage II	Retraction with contact onto the incus	TM touches the incus/ossicular chain; still not adherent
Stage III	Middle ear atelectasis	TM retracted onto the promontory; middle ear space partially/completely obliterated but mucosa intact and TM is non-adherent
Stage IV	Adhesive otitis media	TM completely adherent to ossicles and promontory; middle ear space totally obliterated; mucosal surfaces lost

- Cummings Otolaryngology Head and Neck Surgery, p. 2682-2683

Otoscopic appearance

Endoscopic view of middle ear atelectasis with effusion showing retracted, translucent tympanic membrane draped over middle ear structures

Fig. 140.1 - Middle ear atelectasis with effusion (Cummings Otolaryngology)

Pathophysiology

The primary cause is eustachian tube dysfunction leading to:

Loss of middle ear ventilation
Development of negative pressure as middle ear mucosa absorbs nitrogen
The posterior-superior pars tensa and pars flaccida are most vulnerable - they have thinner, more sparsely distributed collagen and increased vascular supply
Inflammation and infection further damage collagenous support
Progressive TM weakening and inward retraction

The atelectatic TM is histologically characterized by hyperkeratosis, edema and inflammation of the lamina propria, and loss of collagen organization.

- Shambaugh Surgery of the Ear, p. 2253-2268

Audiological Consequences

Stages I-II: Minimal hearing loss
Stage III: Conductive hearing loss up to 25 dB (as long as round window remains aerated and shielded)
Stage IV / round window involvement: Air-bone gaps of 40-50 dB (loss of round window protection)

Red Flags / Warning Signs for Progressive Disease

Deep retraction pocket where the medial extent cannot be visualized
Conductive hearing loss
Recurrent otorrhea
Polypoid tissue or crusts covering a pocket
"Trail sign" - a line of keratin extending from the pocket along the posterior EAC wall (may indicate cholesteatoma)
These pockets are considered precursors to cholesteatoma

Management - By Stage

Stage I (Mild Retraction)

Observation with routine microscopic exams to assess for progression
Treat underlying ET dysfunction: manage allergy, adenoid disease, GERD
Encourage autoinflation (Valsalva, Otovent balloon)
Topical agents: acetic acid drops, mineral oil to prevent debris accumulation
Monitor for progression

Stage II (Contact with Ossicles)

All of the above
Consider ventilating tube (tympanostomy tube) insertion - can reverse early atelectasis
Sadé (1976) showed ventilating tubes improved atelectatic ears
Laser myringotomy has also been used

Stage III (True Atelectasis)

Tympanostomy tube insertion (may be difficult due to thinned lamina propria leading to early extrusion)
Myringoplasty for reinforcement of the atelectatic TM, especially if hearing loss present
Cartilage tympanoplasty - cartilage provides structural support resisting negative pressure
Simple excision of the damaged TM segment (allows re-healing with thicker, stronger scar tissue)
Laser-assisted contraction myringoplasty (Ostrowski & Bojrab technique) - addresses redundant/weakened atelectatic TM

Stage IV (Adhesive Otitis Media)

Tympanoplasty (with or without ossiculoplasty)
Cartilage tympanoplasty - preferred for reconstruction
Tympanoplasty + mastoidectomy for complicated disease
Ossicular chain reconstruction if erosion present (most commonly: long process of incus and stapes superstructure)

Note: Postoperative recurrence is not uncommon with any of these techniques, and thinning of the lamina propria makes tympanostomy tube retention tenuous.

- Shambaugh Surgery of the Ear, p. 2289-2296; Cummings Otolaryngology, p. 2683

Summary Table

Stage	Description	Management
I	Simple retraction	Observation, autoinflation, treat ET dysfunction
II	Contact with incus	Ventilating tube, laser myringotomy
III	Atelectasis (non-adherent)	VT, myringoplasty, cartilage grafting, laser myringoplasty
IV	Adhesive otitis media (adherent)	Tympanoplasty ± mastoidectomy, ossicular reconstruction

Key principle: The goal at every stage is to restore middle ear ventilation and prevent progression to cholesteatoma. Cartilage tympanoplasty provides the most durable repair because cartilage resists negative pressure far better than fascia or perichondrium alone.

Sources: Cummings Otolaryngology Head and Neck Surgery (Chapter 140); Shambaugh Surgery of the Ear; Scott-Brown's Otorhinolaryngology Head & Neck Surgery Vol. 2

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