Chronic suppurative otitis media
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"chronic suppurative otitis media" AND management
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chronic suppurative otitis media tympanic membrane perforation
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Chronic Suppurative Otitis Media (CSOM)
Definition
CSOM is a complication of acute otitis media (AOM) characterized by persistent tympanic membrane (TM) perforation accompanied by purulent otorrhea, with mastoiditis invariably present. The diagnosis requires discharge lasting more than 2–6 weeks. — Goldman-Cecil Medicine; Textbook of Family Medicine 9e
Classification
CSOM is classified into two types based on the location of pathology:
| Type | TM Involvement | Cholesteatoma | Terminology |
|---|---|---|---|
| Tubotympanic (Safe) | Pars tensa retraction/perforation | Absent | "Safe ear" |
| Atticoantral (Unsafe) | Pars flaccida retraction | Commonly present | "Unsafe ear" |
— K.J. Lee's Essential Otolaryngology
Epidemiology & Risk Factors
- Most common in children under 2 years; disproportionately high incidence in Native Americans, Inuit, Native Australians, and Māori
- Occurs predominantly in areas with limited health resources and low socioeconomic status
- Risk factors:
- Multiple episodes of AOM; AOM in early infancy
- Chronic secretory OM
- Eustachian tube dysfunction
- Tympanostomy tube or TM perforation (allows EAC contamination of middle ear)
- Nasopharyngeal reflux
- Genetic predisposition
— K.J. Lee's Essential Otolaryngology
Pathophysiology
Eustachian Tube (ET) Dysfunction
- Abnormal ET function → decreased aeration of middle ear space
- Nitrogen-absorbing mastoid cells → volume reduction of middle ear
- Negative pressure → TM retraction (most susceptible: pars flaccida)
Biofilm Formation — Central to CSOM
Biofilms are highly organized, sessile bacterial communities that:
- Escape phagocytosis and humoral immunity via impenetrable polysaccharide matrix
- Show markedly increased antibiotic resistance (efflux pumps, decreased metabolic rate, altered gene expression)
- Are frequently polymicrobial, making targeted therapy difficult
- Can be adherent to respiratory epithelium, within mucus, or intracellular (intracellular aggregates found in middle ear specimens)
Pseudomonas aeruginosa is the most common pathogen in OM biofilms; fungal overgrowth (particularly Candida spp.) occurs in up to 35% of ears treated with topical ciprofloxacin.
— K.J. Lee's Essential Otolaryngology; Cummings Otolaryngology
Clinical Features
Symptoms
- Chronic or recurrent otorrhea — often malodorous (hallmark symptom)
- Hearing loss — typically low-frequency conductive (mixed if cochlea involved)
- Aural fullness
Signs
- TM perforation (compensatory mechanism for middle ear aeration)
- Inflammation of middle ear mucosa
- Granulation tissue / aural polyps — often obscure anatomical landmarks
- TM retraction pockets ± cholesteatoma
Complications (if untreated)
Extracranial: Facial nerve palsy, labyrinthitis (vertigo), subperiosteal abscess, bone destruction, petrositis
Intracranial: Brain abscess, subdural/epidural abscess, meningitis, septic venous sinus thrombosis
— K.J. Lee's Essential Otolaryngology; Textbook of Family Medicine 9e
Otoscopic Appearance
Microbiology
| Organism | Notes |
|---|---|
| Pseudomonas aeruginosa | Most common in biofilms |
| Staphylococcus aureus | Common; includes MRSA |
| Non-typable H. influenzae | Common |
| M. catarrhalis | Common |
| Anaerobes | Mixed flora |
| Candida spp. | Fungal superinfection after antibiotic therapy |
— K.J. Lee's Essential Otolaryngology; Harriet Lane Handbook
Diagnosis
Key diagnostic objective: identify or exclude cholesteatoma
- An aural polyp must be considered cholesteatoma until proven otherwise
Investigations:
- Otomicroscopy with pneumatic insufflation — define perforation, retraction pockets
- Audiometry — characterize hearing loss
- High-resolution CT of temporal bones — surgical planning; indicated for complicated CSOM, cholesteatoma on exam, revision surgery
- MRI with contrast — suspected intracranial complications
- Biopsy of granulation tissue — unresponsive to topical therapy to exclude malignancy
— K.J. Lee's Essential Otolaryngology; Goldman-Cecil Medicine
Treatment
Goal: Create a Safe, Dry Ear
- Dry = no otorrhea
- Safe = no keratin debris accumulation, reduced suppurative complication risk
1. Medical Management (First-line)
- Aural toilet (microsuction/dry mopping) — essential to clear debris and biofilm; enhances topical drug penetration
- Topical antibiotics (4–6 week course after debridement):
- Fluoroquinolones (ciprofloxacin/ofloxacin ear drops) — first choice; effective against Pseudomonas
- Polymyxin B or neomycin ± steroid
- Note: biofilms are frequently resistant to topical medication
- Topical antiseptics: acetic acid/alcohol solution
A 2025 Cochrane meta-analysis (PMID 40484405) evaluated systemic antibiotics for CSOM — topical therapy remains the mainstay, with systemic agents reserved for complications or systemic illness.
2. Surgical Management
| Procedure | Indication | Notes |
|---|---|---|
| Tympanoplasty | TM perforation without cholesteatoma | 60–90% success rate; better outcomes in patients who can insufflate air through perforation |
| Tympanomastoidectomy | Cholesteatoma, refractory otorrhea | TM closure rate NOT improved by adding mastoidectomy |
| Canal Wall Up (CWU) | Preferred in children | Second-look surgery may be needed |
| Canal Wall Down (CWD) | Extensive disease, recurrent cholesteatoma | Open cavity requires regular debridement |
| Mastoid obliteration | CWD cavities | Reduces need for ongoing cavity maintenance |
Goals of surgery:
- Remove all cholesteatoma and granulation tissue
- Restore continuity between the middle ear cleft and mastoid cavity
- Permanent hearing restoration
Optimal age for tympanoplasty: Generally delayed until ~10 years; meta-analyses suggest better closure rates in older children (surgery earlier if troublesome otorrhea or hearing loss). Healthy contralateral ear is a more reliable predictor of success than age alone.
— Cummings Otolaryngology; K.J. Lee's Essential Otolaryngology
CSOM and Cochlear Implantation
Cochlear implantation was previously considered contraindicated in CSOM, but retrospective studies show OM prevalence/severity does not increase post-implantation. Current practice: implant if the ear is dry at the time of surgery, with antimicrobial prophylaxis. Multiple surgical staging protocols exist, reflecting the complexity of managing CSOM in CI candidates. — Cummings Otolaryngology
Recent Evidence
- [PMID 40178730] (Systematic Review, 2025) — Global prevalence of CSOM estimated; burden highest in low- and middle-income countries
- [PMID 40484405] (Cochrane, 2025) — Systematic review on systemic antibiotics for CSOM; current guidance favors topical therapy as primary treatment
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