Csom
Reading File
Finding Sources
Searching the Web
chronic suppurative otitis media CSOM clinical features management
Searching PubMed
"chronic suppurative otitis media"[MeSH Terms] AND treatment
Reading File
Reading File
Reading File
Reading File
Finding Sources
Reading File
Reading File
I now have comprehensive information to provide a thorough answer on CSOM. Let me compile everything.
Chronic Suppurative Otitis Media (CSOM)
Definition
CSOM is a chronic infection of the middle ear characterized by persistent otorrhea through a non-intact tympanic membrane (perforation or tympanostomy tube), typically for >2 weeks (some definitions use >6 weeks). Mastoiditis is invariably present.
Classification
| Type | Description |
|---|---|
| Tubotympanic (Safe/Benign) | TM perforation confined to the pars tensa; central perforation; no cholesteatoma |
| Atticoantral (Unsafe/Dangerous) | Involves pars flaccida; retraction pockets; cholesteatoma commonly present; bone erosion likely |
Epidemiology & Risk Factors
- Most common in children <2 years old; peak onset ~2 years of age
- Higher incidence in low socioeconomic settings, indigenous populations (Inuit, Native Americans, Native Australians/New Zealanders)
- Risk factors:
- Multiple episodes of acute otitis media (AOM)
- AOM in first few months of life
- Chronic secretory OM
- Eustachian tube (ET) dysfunction
- Tympanostomy tube or pre-existing TM perforation (allows EAC contamination of ME)
- Nasopharyngeal reflux
Pathophysiology
Eustachian Tube Dysfunction → decreased middle ear aeration → negative ME pressure → TM retraction (most susceptible: pars flaccida) → retraction pockets ± cholesteatoma.
Biofilms are central to chronicity:
- Highly organized sessile bacterial networks
- Protected from phagocytosis and humoral immunity by an impenetrable polysaccharide matrix
- Efflux pumps confer antibiotic resistance
- Frequently polymicrobial → harder to target
- Pseudomonas aeruginosa is the most common pathogen in OM biofilms
Microbiology
| Organism | Notes |
|---|---|
| Pseudomonas aeruginosa | Most common overall |
| Staphylococcus aureus | Common |
| Non-typeable H. influenzae, M. catarrhalis | Common |
| Anaerobes | Especially when cholesteatoma present (foul odor) |
| Candida spp. | Fungal overgrowth, especially post-ciprofloxacin (up to 35% after 3-week topical ciprofloxacin course) |
| Gram-negative bacilli (E. coli, P. aeruginosa) | Without cholesteatoma |
Signs & Symptoms
- Chronic/recurrent otorrhea — often malodorous (especially with cholesteatoma/anaerobes)
- TM perforation (compensatory aeration mechanism)
- Hearing loss — typically low-frequency conductive or mixed
- Aural fullness
- Inflammation of ME mucosa
- Granulation tissue / aural polyps — often obscure anatomical landmarks (an aural polyp should be considered cholesteatoma until proven otherwise)
- TM retraction pockets ± cholesteatoma
Complicated CSOM features:
- Facial nerve paresis/paralysis
- Vertigo (labyrinthine fistula)
- Signs of intracranial infection
Diagnosis
- Otomicroscopy with pneumatic insufflation — key exam; identify cholesteatoma
- Audiometry — characterize hearing loss
- Imaging:
- High-resolution CT temporal bones — surgical planning, complicated CSOM, cholesteatoma, revision cases
- MRI with contrast — suspected intracranial complications
- Biopsy of granulation tissue unresponsive to topical therapy — rule out malignancy
Complications
Extracranial
- Bone destruction
- Subperiosteal abscess
- Facial paralysis
- Labyrinthitis
- Petrositis (Gradenigo syndrome)
Intracranial
- Brain abscess
- Subdural abscess
- Epidural abscess
- Septic thrombosis of venous sinuses (lateral sinus thrombosis)
- Meningitis
Treatment
Goals
- Safe ear: no cholesteatoma, no keratin debris collection, reduced risk of suppurative complications
- Dry ear: no otorrhea
Medical (Non-operative)
| Modality | Details |
|---|---|
| Aural toilet | Suction clearance of debris; essential before topical therapy |
| Topical antibiotics | First-line; 4–6 week course after debridement. Options: fluoroquinolones (ciprofloxacin — preferred), polymyxin B or neomycin ± steroid |
| Topical antiseptics | Acetic acid/alcohol (especially where fluoroquinolones unavailable) |
| Systemic antibiotics | Less effective than topical alone; may supplement in selected cases |
Patients respond more frequently to topical than to systemic therapy. Biofilms are frequently resistant to topical medication due to multicellular resistance strategies.
Surgical
| Procedure | Indication |
|---|---|
| Tympanoplasty | Persistent TM perforation; 60–90% success rate; better outcomes in older children (>10 yrs). Increased success if patient can insufflate air through perforation |
| Tympanomastoidectomy | Cholesteatoma; otorrhea refractory to medical treatment |
| - Canal wall up | Preserves EAC anatomy; second-look surgery often needed |
| - Canal wall down ± obliteration | Advanced disease; creates open mastoid cavity |
| Atticotomy (transcanal) | Limited attic disease |
Surgical goals:
- Remove all cholesteatoma and granulation tissue
- Restore continuity between ME cleft and mastoid cavity
Special note on tympanoplasty timing in children: Surgery is generally deferred until ~10 years old. Younger children have higher failure rates (AOM risk, adenoid hypertrophy, immature ET function). A healthy contralateral ear is a more reliable predictor of success than age alone.
CSOM and Cochlear Implantation
In CI candidates with CSOM, implantation can proceed if the ear is dry at time of implantation. Multiple staged approaches exist:
- Dry TM perforation → myringoplasty → CI after 3 months
- Cholesteatoma/unstable cavity → radical mastoidectomy + obliteration → CI months later
- Stable cavity → one-stage obliteration + implantation
Sources: KJ Lee's Essential Otolaryngology; Cummings Otolaryngology Head and Neck Surgery; Textbook of Family Medicine 9e (Harriet Lane Handbook for bacteriology summary)
This is a shared conversation. Sign in to Orris to start your own chat.