Acute middle ear infection with effusion and signs of inflammation, most common in young children.
Also known as: AOM, middle ear infection, ear infection, suppurative otitis media
Overview
Acute infection of the middle ear cleft characterized by middle ear effusion (MEE) plus rapid onset of signs and symptoms of middle ear inflammation. Distinguished from otitis media with effusion (OME), which lacks acute inflammatory signs.
Epidemiology
Most common bacterial infection of childhood; peak incidence 6-24 months. By age 3, ~80% of children have had at least one episode. Risk highest in fall/winter following viral URI.
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Question 1EENTEasy
A 3-year-old boy has ear pain and fever to 39.5°C. Examination shows bilaterally bulging, erythematous tympanic membranes. Which of the following is the most appropriate treatment?
AOral azithromycin suspension
BWatchful waiting for 48–72 hours
CHigh-dose oral amoxicillin
DCiprofloxacin otic drops
ETympanostomy tube placement
Reveal answer & full explanation
Correct answer: C — High-dose oral amoxicillin
AOral azithromycin suspension
BWatchful waiting for 48–72 hours
CHigh-dose oral amoxicillin✓
DCiprofloxacin otic drops
ETympanostomy tube placement
Why High-dose oral amoxicillin is correct
Bulging, erythematous tympanic membranes with otalgia and fever indicate acute otitis media; the fever of 39.5°C (≥39°C) makes this severe disease (bilateral involvement alone does not define severity)
Per American Academy of Pediatrics guidance, severe acute otitis media warrants immediate antibiotics regardless of age, and high-dose amoxicillin (80-90 mg/kg/day) is first-line when the child has not recently taken amoxicillin and has no penicillin allergy
Amoxicillin-clavulanate or intramuscular ceftriaxone is used for treatment failure at 48-72 hours; cefdinir, cefuroxime, or cefpodoxime is an alternative in non-severe penicillin allergy, while macrolides such as azithromycin are a poor last resort because of high resistance
Why the others are wrong
Tympanostomy tube placement — reserved for recurrent acute otitis media or persistent effusion, not a first acute episode; the right-condition-wrong-step trap
Ciprofloxacin otic drops — appropriate for otitis externa or otorrhea through a perforation or tube, but topical drops do not treat infection behind an intact bulging membrane; buzzword-match on "ear drops"
Watchful waiting for 48–72 hours — an option only for non-severe acute otitis media without high fever, so the severe fever here excludes it; premature closure on the observation strategy
Oral azithromycin suspension — once-daily dosing and a short course make it a tempting choice for a febrile toddler, but macrolides have limited efficacy against the main acute otitis media pathogens (pneumococcal macrolide resistance is high, and Haemophilus influenzae is intrinsically less susceptible, so azithromycin eradicates it poorly), making azithromycin a poor last resort, not first-line therapy for a child with no known penicillin allergy; the convenience-over-coverage trap
Question 2EENTEasy
A 3-year-old boy who attends daycare has had 4 episodes of acute otitis media this year, each with sudden ear pain, fever, and a bulging erythematous tympanic membrane. The current episode began yesterday with severe left ear pain and a temperature of 39.4 C (102.9 F), and each prior episode resolved with amoxicillin, most recently 5 months ago. He has no penicillin allergy. Which of the following is the most appropriate first-line treatment for this episode?
AHigh-dose amoxicillin
BObservation
CAmoxicillin-clavulanate
DTopical fluoroquinolone otic drops
EIntravenous ceftriaxone
Reveal answer & full explanation
Correct answer: A — High-dose amoxicillin
AHigh-dose amoxicillin✓
BObservation
CAmoxicillin-clavulanate
DTopical fluoroquinolone otic drops
EIntravenous ceftriaxone
Why High-dose amoxicillin is correct
Acute otitis media (AOM) is the most common bacterial infection in children
Diagnostic criteria: bulging tympanic membrane (most important finding), acute onset, and middle ear effusion
Common pathogens: S. pneumoniae, H. influenzae (most common in recurrent AOM), and M. catarrhalis
First-line treatment: amoxicillin 80-90 mg/kg/day for 5-10 days
Severe AOM (moderate or severe otalgia, otalgia for 48 hours or more, or a temperature of 39 C or higher) warrants immediate antibiotics at any age; this child's 39.4 C fever and severe ear pain qualify, and because prior episodes responded to amoxicillin and none was given in the past 30 days, amoxicillin remains first-line (otherwise amoxicillin-clavulanate)
Why the others are wrong
Observation — an option only for non-severe AOM (unilateral disease at 6-23 months, unilateral or bilateral disease at 2 years or older) with shared decision-making and reliable follow-up; a temperature of 39 C or higher and severe otalgia define severe AOM, which requires antibiotics (confused-with watchful waiting)
Topical fluoroquinolone otic drops — used for otitis externa or AOM with tympanostomy tubes, not intact-membrane AOM (right-concept-wrong-route)
Intravenous ceftriaxone — reserved for treatment failure or when oral therapy is not tolerated; not first-line (premature escalation)
Amoxicillin-clavulanate — tempting because this daycare child has recurrent AOM and H. influenzae often produces beta-lactamase, but added beta-lactamase coverage is reserved for amoxicillin use in the past 30 days, concurrent purulent conjunctivitis, or recurrent AOM unresponsive to amoxicillin; every prior episode here responded and the last course was 5 months ago (over-treating recurrence)
Additional high-yield points
Treatment failure (no improvement at 48-72 hours): switch to amoxicillin-clavulanate
Tympanostomy tube indications: recurrent AOM (3 episodes in 6 months, or 4 in 12 months with at least 1 in the past 6 months) only when middle ear effusion is present at the time of assessment; bilateral otitis media with effusion for 3 months or longer with documented hearing difficulty
Tympanostomy tubes give a modest, short-term reduction in AOM frequency
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Absence of breastfeeding (breastfeeding ≥6 months is protective)
Craniofacial anomalies (cleft palate, Down syndrome)
Family history of recurrent AOM
Native American, Alaskan Native, and Australian Aboriginal ancestry
Pathophysiology
Viral URI causes eustachian tube dysfunction and mucosal edema, impairing middle ear drainage. Negative pressure draws nasopharyngeal secretions retrograde into the middle ear, where bacterial pathogens proliferate in the resulting effusion. Common bacterial pathogens: Streptococcus pneumoniae, non-typeable Haemophilus influenzae, Moraxella catarrhalis. Viruses (RSV, rhinovirus) may be the sole pathogen.
Clinical presentation
Symptoms
Ear pain (otalgia) — pulling/tugging at ear in preverbal children
In older children/adults: localized pain, sensation of ear fullness
Signs / physical exam
Bulging tympanic membrane — most specific sign
Loss of bony landmarks; opacification; yellow, white, or hemorrhagic color
Impaired TM mobility on pneumatic otoscopy
Air-fluid level or bubbles behind TM (confirms effusion, also seen in OME; not diagnostic of AOM without bulging or acute inflammation)
Otorrhea through a perforation
Classic findings
Bulging, opacified TM with impaired mobility on pneumatic otoscopy in a febrile child with otalgia.
Differential diagnosis
Otitis media with effusion (OME) — Middle ear effusion without acute inflammatory signs; usually painless; hearing loss; no fever; observation appropriate
Otitis externa — Pain on tragal pressure or pinna traction, erythematous swollen canal with debris, normal TM if visible; treat with topical otic drops
Bullous myringitis — Painful bullae on TM; classically Mycoplasma but most often pneumococcus; treat as AOM
Mastoiditis — Postauricular erythema, swelling, fluctuance, protruding auricle, fever; CT temporal bone confirms; IV antibiotics ± surgical drainage
Foreign body in ear canal — Unilateral pain or discharge, often in toddlers; direct visualization; removal under microscopy
Dental pain referred — Posterior molar caries can refer pain to ear; normal otoscopy
TMJ dysfunction — Preauricular pain, clicking with jaw motion, normal TM
Diagnostic workup
Diagnostic criteria
AAP 2013: (1) Moderate-to-severe bulging of TM or new-onset otorrhea not due to otitis externa, OR (2) mild bulging with recent (<48 h) onset of ear pain or intense erythema of TM. Middle ear effusion must be present.
Labs
AOM is a clinical diagnosis; laboratory testing is rarely needed
Tympanocentesis with culture reserved for treatment failure, immunocompromised, or neonates
Imaging
Pneumatic otoscopy or tympanometry — confirms middle ear effusion when otoscopy ambiguous
CT temporal bone if mastoiditis, intracranial complication, or cholesteatoma suspected
Diagnostic algorithm
Age / Severity
Antibiotic Decision
Preferred Agent
<6 months, any severity
Antibiotics always
Amoxicillin or amox-clav
6-23 months, bilateral or severe
Antibiotics always
Amoxicillin 80-90 mg/kg/day
6-23 months, unilateral non-severe
Antibiotics OR 48-72 h observation
Amoxicillin if treating
≥24 months, severe (moderate-severe otalgia, otalgia ≥48 h, or T ≥39°C) or otorrhea
Antibiotics always
Amoxicillin or amox-clav
≥24 months, non-severe
Antibiotics OR observation with follow-up
Amoxicillin if treating
Any age, treatment failure at 48-72 h
Switch antibiotic
Amoxicillin-clavulanate or ceftriaxone IM
AAP 2013 management algorithm for acute otitis media by age, severity, and treatment response.
Treatment
First-line
Amoxicillin 80-90 mg/kg/day divided BID × 10 days if <2 y or severe (7 days if 2-5 y and non-severe; 5-7 days if ≥6 y and non-severe) — preferred if no amoxicillin in prior 30 days, no concurrent purulent conjunctivitis, and no history of recurrent AOM unresponsive to amoxicillin
Amoxicillin-clavulanate 90 mg/kg/day amoxicillin component if any of the above risk factors are present, or for treatment failure at 48-72 h
Analgesia: acetaminophen or ibuprofen — addressed independently of antibiotic decision
Observation option (deferred antibiotics, reassess 48-72 h) for non-severe AOM (mild otalgia <48 h and T <39°C) in children ≥6 months without otorrhea (unilateral only at 6-23 months) — requires reliable follow-up
Second-line / adjunct
Cefdinir, cefuroxime, or cefpodoxime for non-anaphylactic penicillin allergy
Azithromycin or clindamycin for severe penicillin allergy (high resistance — use only when alternatives unavailable)
Ceftriaxone IM 50 mg/kg daily × 1-3 days for vomiting or oral intolerance
Tympanostomy tubes: recurrent AOM (≥3 episodes in 6 months, or ≥4 in 12 months with ≥1 in the past 6 months) only if middle ear effusion is present at assessment; bilateral OME ≥3 months with documented hearing difficulty
Complications
TM perforation (usually heals spontaneously)
Mastoiditis — postauricular swelling, requires IV antibiotics ± mastoidectomy
Cholesteatoma from chronic perforation or retraction pocket
Conductive hearing loss with speech/language delay if persistent effusion
Facial nerve palsy (rare, traverses middle ear)
PANCE pearls
Bulging TM is the single most important finding — erythema alone is nonspecific (crying can cause it).
AOM in any child <6 months → always treat with antibiotics. Ages 6-24 months: treat if bilateral, severe, or otorrhea; otherwise observation option.
Concurrent purulent conjunctivitis suggests non-typeable H. influenzae → use amoxicillin-clavulanate.
PCV13/PCV15/PCV20 vaccination has shifted pathogen epidemiology — H. influenzae now equals or exceeds S. pneumoniae in many settings.
Recurrent AOM = ≥3 episodes in 6 months or ≥4 in 12 months (≥1 in the past 6 months) — offer tympanostomy tubes only if middle ear effusion is present at assessment.
References
AAP 2013 — Lieberthal AS et al. The diagnosis and management of acute otitis media. Pediatrics 2013;131(3):e964-e999
AAO-HNS 2022 — Rosenfeld RM et al. Clinical Practice Guideline: Tympanostomy Tubes in Children (Update). Otolaryngol Head Neck Surg 2022
Coker 2010 (JAMA) — Coker TR et al. Diagnosis, microbial epidemiology, and antibiotic treatment of acute otitis media in children: a systematic review. JAMA 2010;304(19):2161-2169
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