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Acute supportive otitis media

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acute suppurative otitis media ear drum tympanic membrane

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otitis media tympanic membrane bulging perforation otoscopy

A comparison chart of otoscopic diagnostic images from a medical simulator, focusing on pathologies of the tympanic membrane (TM). The visual contains three labeled primary circular otoscopic views: 1) 'Acute otitis media with perforation,' showing an inflamed, erythematous TM with a large, irregular central perforation through which the middle ear space is visible; 2) 'Acute otitis media,' depicting an intensely hyperemic, opaque, and bulging TM with loss of normal landmarks and light reflex; and 3) 'Otitis media with effusion,' illustrating a translucent, amber-colored TM with visible air-fluid levels and bubbles in the middle ear space. These clinical photographs serve as educational examples for ENT trainees to differentiate between infectious stages (AOM) and non-purulent fluid accumulation (OME). The interface includes secondary supportive images below each category to demonstrate variability in presentation. This content is designed for medical students and residents to master diagnostic otoscopy and middle ear pathology recognition.

A comparison chart of otoscopic diagnostic images from a medical simulator, focusing on pathologies of the tympanic membrane (TM). The visual contains three labeled primary circular otoscopic views: 1) 'Acute otitis media with perforation,' showing an inflamed, erythematous TM with a large, irregular central perforation through which the middle ear space is visible; 2) 'Acute otitis media,' depicting an intensely hyperemic, opaque, and bulging TM with loss of normal landmarks and light reflex; and 3) 'Otitis media with effusion,' illustrating a translucent, amber-colored TM with visible air-fluid levels and bubbles in the middle ear space. These clinical photographs serve as educational examples for ENT trainees to differentiate between infectious stages (AOM) and non-purulent fluid accumulation (OME). The interface includes secondary supportive images below each category to demonstrate variability in presentation. This content is designed for medical students and residents to master diagnostic otoscopy and middle ear pathology recognition.

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Acute Suppurative Otitis Media (ASOM)

Acute suppurative otitis media (ASOM), also called acute otitis media (AOM), is a bacterial infection of the middle ear cleft characterized by the presence of purulent middle ear fluid with signs and symptoms of acute inflammation.

Otoscopic Appearance

Otoscopic comparison: AOM with perforation, AOM (bulging TM), and OME

Epidemiology

  • The most common infection for which children visit a physician's office
  • Annual cost in the US: ~$2.88 billion
  • By age 7 years, 93% of children have had at least one episode; 75% have had recurrent infections
  • Highest incidence: 6-24 months of age
  • Can affect adults, often secondary to concurrent viral upper respiratory infection

Pathophysiology

The primary mechanism is eustachian tube dysfunction. Abnormal tubal compliance plus delayed innervation of the tensor veli palatini muscle leads to tube collapse, creating negative middle ear pressure. This allows nasopharyngeal organisms to ascend and colonize the middle ear space. A viral upper respiratory infection almost always precedes an episode.

Microbiology

The three most common bacterial pathogens are:
OrganismFrequency
Streptococcus pneumoniae25-40%
Haemophilus influenzae10-30%
Moraxella catarrhalis2-15%
Viruses and anaerobes can also contribute. Post-PCV vaccination, the relative contribution of H. influenzae (especially non-typeable) has increased.

Risk Factors

  • Male gender
  • Bottle feeding (especially supine)
  • Daycare attendance / exposure to URTIs
  • Parental smoking
  • Use of a pacifier
  • Genetic and ethnic factors (Inuit, Native American)
  • Craniofacial abnormalities (e.g., cleft palate)
  • Allergy
  • Previous episode of AOM within the preceding 3 months

Clinical Features

Symptoms:
  • Acute onset otalgia (or ear tugging/rubbing in a nonverbal child)
  • Fever
  • Hearing loss (conductive)
  • Irritability, poor feeding in infants
Signs (otoscopic):
  • Moderate to severe bulging of the tympanic membrane (TM) - the hallmark
  • Intense erythema of the TM
  • Middle ear effusion (air-fluid levels, absent TM mobility on pneumatic otoscopy)
  • Flat tympanogram (no TM movement)
  • Spontaneous perforation with otorrhea (purulent discharge) if severe
  • Bullous myringitis - bullae on the TM in some AOM cases; treatment does not differ
Erythema of TM without middle ear effusion = myringitis (separate diagnosis). Ear pain with a normal, flaccid TM = cause other than AOM.
Diagnosis requires ALL of:
  1. Acute onset of symptoms
  2. Middle ear effusion (MEE) - must be present
  3. Signs/symptoms of middle ear inflammation

Management

Analgesia (All Patients - Immediate)

Antibiotics alone do not provide pain relief in the first 24 hours. Pain must be treated separately with acetaminophen or ibuprofen.

Watchful Waiting vs. Immediate Antibiotics

Per AAP/AAFP guidelines, a watch-and-wait option (48-72 hours observation) is acceptable for selected patients:
GroupApproach
Infants < 6 monthsImmediate antibiotics
6-23 months with bilateral diseaseImmediate antibiotics
Any age with severe signs/symptomsImmediate antibiotics
Older children, nonsevere, unilateralObservation acceptable

First-Line Antibiotic Therapy

Amoxicillin at 80-90 mg/kg/day is the drug of choice (per AAP, AAFP, Red Book guidelines).
Duration:
  • Children < 6 years or severe disease: 10-day course
  • Children ≥ 6 years with mild-moderate disease: 5-7 days

Treatment Failure (reassess at 48-72 hours)

If the patient fails initial amoxicillin, switch to an agent active against:
  • Penicillin-nonsusceptible S. pneumoniae
  • Beta-lactamase-producing H. influenzae and M. catarrhalis
Second-line options:
  • High-dose amoxicillin-clavulanate (oral)
  • Cefdinir, cefpodoxime, cefuroxime (oral)
  • Ceftriaxone IM once daily x 3 days
Macrolides (azithromycin, clarithromycin) are NOT appropriate alternatives due to high S. pneumoniae resistance.
Severe penicillin allergy (type I / anaphylactic):
  • Clindamycin (if susceptibility known) or levofloxacin
Non-type I penicillin allergy:
  • Cefdinir, cefuroxime, or cefpodoxime (oral)

Myringotomy / Tympanocentesis

Indications:
  • Failure to respond to second-line therapy
  • Severe cases - to obtain cultures to guide therapy
  • Patients with invasive pneumococcal infection
  • Multi-drug resistant strains (consult ID specialist)

Tympanostomy Tubes

Indicated for recurrent AOM (3+ episodes in 6 months, or 4+ in 1 year) or persistent middle ear effusion.

Complications

Intratemporal:
  • Acute mastoiditis - most common suppurative complication (though rare in the modern era); characterized by post-auricular erythema/tenderness, and displacement of the auricle
  • Facial nerve palsy
  • Labyrinthitis
  • Petrositis
Intracranial:
  • Meningitis
  • Intracranial abscess (extradural, subdural, brain)
  • Lateral sinus thrombosis
  • Otitic hydrocephalus
Mastoiditis presents with otalgia, aural discharge, and fever typically 2-3 weeks after an episode of ASOM.

AOM with Perforation

Otitis media with otorrhea from an acute TM perforation is treated in the same manner as AOM without perforation. These perforations are typically small and resolve spontaneously.

Special Situations

  • Patients with tympanostomy tubes presenting with acute otorrhea: treat with ototopical fluoroquinolone drops (e.g., ciprofloxacin/dexamethasone)
  • Adults: observation strategies are not validated in adult patients; treat with antibiotics when bacterial AOM is confirmed

Prevention

  • PCV13 (pneumococcal conjugate vaccine) - licensed from 6 weeks of age; significantly reduces AOM burden by covering 13 serotypes including the most virulent
  • PCV23 (polysaccharide) - children ≥ 2 years and adults
  • Breastfeeding, smoking cessation, avoiding pacifier use after 6 months
Sources:
  • Textbook of Family Medicine, 9e, pp. 407-410
  • Rosen's Emergency Medicine, Vol. 10, pp. 516-532
  • Red Book 2021 (AAP Committee on Infectious Diseases), pp. 1115-1117
  • Berek & Novak's Gynecology, p. 1049
  • Swanson's Family Medicine Review, block 3
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