Pediatrics (System-Integrated)

Acute otitis media: diagnosis and watchful waiting vs antibiotics

Clinical Overview and When to Suspect AOM

— Top bacterial pathogens: Streptococcus pneumoniae, non-typeable Haemophilus influenzae, Moraxella catarrhalis.

— Post-PCV13 era: relative rise of H. influenzae and beta-lactamase–producing strains.

— Daycare attendance, tobacco smoke exposure, supine bottle-feeding, pacifier use beyond 6 mo

— Absence of breastfeeding (<3 months exclusive)

— Native American/Alaska Native ethnicity, craniofacial anomalies (cleft palate, Down syndrome)

— Winter/early spring seasonality

— Toddler with 3 days of URI symptoms now febrile, irritable, tugging at ear, poor sleep

— School-age child with otalgia + decreased hearing after recent cold

— Infant with nonspecific fussiness, decreased PO intake, fever without obvious source

— Moderate-to-severe bulging of TM, or new-onset otorrhea not from otitis externa

— Mild bulging PLUS recent (<48 h) otalgia or intense TM erythema

Board pearl: "Red TM" alone is not AOM — crying and fever redden tympanic membranes. Bulging is the single most specific exam finding. Without MEE (confirmed by bulging, air-fluid level, or reduced mobility on pneumatic otoscopy), the diagnosis is not AOM — consider otitis media with effusion (OME) instead, which does not warrant antibiotics.

Acute otitis media (AOM) is a suppurative middle-ear infection defined by rapid onset of signs/symptoms with middle ear effusion (MEE) plus middle ear inflammation.

Peak incidence 6–24 months; ~80% of children have ≥1 episode by age 3. Risk drops sharply after age 5 as the eustachian tube becomes longer and more vertical.

Pathogenesis: viral URI → eustachian tube dysfunction → negative middle ear pressure → effusion → bacterial superinfection.

Risk factors (test-favorite list):

When to suspect on Step 3 ambulatory stems:

AAP 2013 diagnostic criteria require ONE of:

Presentation Patterns and Key History

— Age (drives management threshold — <6 mo, 6–24 mo, ≥24 mo)

— Laterality (bilateral in <24 mo lowers threshold to treat)

— Severity: temp ≥39°C (102.2°F), moderate-severe otalgia, or otalgia ≥48 h = "severe AOM"

— Prior AOM episodes and timing — recurrent AOM = ≥3 episodes in 6 mo or ≥4 in 12 mo (with ≥1 in last 6 mo)

— Recent antibiotics (within 30 days) → resistance risk → high-dose amox-clav

— Concurrent purulent conjunctivitis → strongly suggests non-typeable H. influenzae ("otitis-conjunctivitis syndrome") → choose amox-clav up front

— Drug allergies, especially penicillin (and type of reaction)

— Immunization status (PCV13/15/20, Hib, influenza)

— Daycare, sick contacts, smoke exposure

— Toxic appearance, neck stiffness, focal neuro signs, postauricular swelling/erythema (mastoiditis), facial nerve palsy, severe vertigo

— Immunocompromise, cochlear implant, craniofacial anomaly

Step 3 management: When the stem mentions conjunctivitis + AOM, skip amoxicillin and go straight to amoxicillin-clavulanate — H. influenzae is the predicted organism and >30% are beta-lactamase producers.

Classic toddler stem: 48–72 hours of URI (rhinorrhea, cough) followed by abrupt fever, otalgia, night waking, ear-tugging, decreased appetite. May have vomiting from vestibular irritation.

Older verbal child: directly localizes unilateral ear pain, muffled hearing, "popping" sensation, sometimes vertigo.

Otorrhea = purulent drainage through perforated TM → diagnostic of AOM (assuming not otitis externa). Often pain improves abruptly after perforation due to pressure release.

Nonspecific infant presentation: irritability, poor feeding, sleep disturbance, low-grade fever. Ear-pulling alone is not specific — many afebrile well children tug ears.

Key history elements the stem will plant:

Red flags requiring escalation, not watchful waiting:

Physical Exam Findings and Pneumatic Otoscopy

— Bulging (loss of bony landmarks, convex contour) — most specific

— Opacification (yellow/white) from purulent MEE

— Impaired mobility on pneumatic otoscopy — most sensitive sign of MEE

— Erythema — supportive but nonspecific

— Air-fluid level or bubbles — indicates MEE; if TM not bulging and child asymptomatic, this is OME, not AOM

— Otorrhea through perforation — diagnostic

— Document fever curve, hydration status, activity level

— Assess for toxic appearance — lethargy, poor perfusion, grunting

— Postauricular tenderness, erythema, fluctuance, protruding auricle → mastoiditis → CT temporal bones, IV antibiotics, ENT

— Facial nerve weakness → intratemporal complication

— Nystagmus, ataxia → labyrinthitis or intracranial extension

— Meningismus → LP after imaging

Key distinction: MEE without inflammation = OME (watchful waiting, no antibiotics, hearing/speech surveillance). MEE with bulging or acute inflammation = AOM (apply treatment algorithm). Mislabeling OME as AOM is the #1 driver of unnecessary pediatric antibiotic use.

Required for diagnosis: adequate visualization of the TM with cerumen removed. Step 3 stems often hide the diagnosis behind "obscured by cerumen" — the right next step is cerumen removal, not empiric antibiotics.

Normal TM: pearly gray, translucent, neutral position, visible bony landmarks (malleus, light reflex), brisk mobility with pneumatic insufflation.

AOM TM findings (in order of specificity):

Pneumatic otoscopy is the AAP-recommended bedside gold standard. Tympanometry (flat type B tracing) and acoustic reflectometry are adjuncts when otoscopy is equivocal.

Vital signs and general assessment:

Critical exam findings that change management:

Distinguish from otitis externa: pain with tragal traction or auricular manipulation, edematous external canal, normal TM mobility if visible.

Diagnostic Workup — Clinical Diagnosis and Limited Adjuncts

— Position (bulging vs neutral vs retracted)

— Color and translucency

— Mobility

— Presence of effusion or perforation

— Tympanometry: type B (flat) confirms MEE; type A excludes effusion. Useful when bulging is uncertain.

— Acoustic reflectometry: portable, useful in primary care

— Audiometry: indicated for persistent OME ≥3 months or suspected hearing loss affecting speech/language

— Treatment failure after second-line antibiotics

— Severe otalgia for pain relief

— AOM in neonate <6 weeks (atypical pathogens: GBS, gram-negatives, S. aureus)

— Immunocompromised host

— Suppurative complications

— Infant <3 months with fever ≥38°C → full fever-without-source workup (CBC, blood culture, UA, often LP) regardless of ear exam

— Toxic-appearing child of any age

— Concern for mastoiditis or intracranial extension

— CT temporal bones with contrast: suspected mastoiditis, subperiosteal abscess

— MRI brain with contrast: suspected meningitis, sigmoid sinus thrombosis, intracranial abscess, labyrinthitis

Board pearl: A febrile neonate with AOM still requires a full sepsis workup — ear findings do not explain the fever in this age group, and management defaults to admission with broad empiric IV antibiotics until cultures clear.

AOM is a clinical diagnosis — no routine labs, no imaging, no cultures in uncomplicated cases. Step 3 stems testing "next best step" want otoscopic exam, not CBC or CT.

Pneumatic otoscopy + history satisfies diagnosis in nearly all cases. Document:

Adjunct testing reserved for equivocal exams or atypical course:

Tympanocentesis (middle ear fluid aspiration for culture) — not routine. Indications:

When to obtain labs:

Imaging is not for diagnosis of AOM itself but for complications:

Diagnostic Workup — Confirming Complications and Recurrent Disease

— Recurrent AOM (≥3 in 6 mo or ≥4 in 12 mo with one recent) → consider audiometry, speech evaluation, ENT referral for tympanostomy tubes

— Chronic OME ≥3 months bilateral → audiometry mandatory; tubes if hearing loss ≥25 dB or language delay

— <6 months: auditory brainstem response (ABR)

— 6 months–2 years: visual reinforcement audiometry

— 2–5 years: conditioned play audiometry

— >5 years: conventional audiometry

— CT with contrast for mastoiditis: coalescent mastoid air cells, bony erosion, subperiosteal abscess

— MRI/MRV if sigmoid sinus thrombosis, otitic hydrocephalus, or intracranial abscess suspected (persistent fever after mastoiditis treatment, headache, papilledema)

— Bony erosion of tegmen tympani → meningitis risk

— Tympanocentesis fluid → Gram stain, culture, susceptibilities

— Otorrhea from spontaneous perforation can be cultured but skin flora contaminates

— Blood cultures only if toxic or complicated

— Quantitative immunoglobulins (IgG, IgA, IgM, IgG subclasses)

— Specific antibody response to vaccines (pneumococcal titers pre/post)

— Consider in child with >6 episodes/year, failure to thrive, other sinopulmonary infections

— Cleft palate, Down syndrome → eustachian tube dysfunction

— Primary ciliary dyskinesia → persistent OME + chronic rhinitis + situs inversus

— Allergic rhinitis as modifier

CCS pearl: In a CCS-style case of recurrent AOM, after documenting frequency and confirming immunizations, order audiometry and refer to ENT for tube discussion — do not loop through repeated antibiotic courses; the case clock rewards definitive disposition.

Persistent or recurrent disease prompts deeper workup:

Audiologic assessment:

Imaging in complicated AOM:

Microbiology when obtained:

Workup for immunologic causes of recurrent AOM:

Structural/genetic considerations:

Watchful Waiting vs Antibiotics — Management Logic

— <6 months: any AOM

— 6–23 months with bilateral AOM (any severity)

— Any age with severe AOM (severe pain, high fever, otorrhea)

— Otorrhea from spontaneous TM perforation at any age

— 6–23 months with unilateral non-severe AOM

— ≥24 months with unilateral or bilateral non-severe AOM

— Shared decision-making with caregiver

— Symptomatic treatment (acetaminophen/ibuprofen, topical analgesics if TM intact)

— Safety-net antibiotic prescription (SNAP) or scheduled reassessment at 48–72 hours

— Start antibiotics if no improvement or worsening at 48–72 h

— Acetaminophen 10–15 mg/kg q4–6h or ibuprofen 10 mg/kg q6h (>6 months)

— Topical benzocaine/procaine drops if TM intact and ≥2 years (limited evidence)

— Avoid codeine in children (FDA boxed warning, ultra-rapid metabolizers)

Step 3 management: A 22-month-old with unilateral, non-severe AOM and reliable parents = shared decision-making with observation option; a 22-month-old with bilateral AOM = antibiotics now. Laterality flips the decision in this age band.

AAP 2013 algorithm balances three variables: age, laterality, severity.

Define severe AOM: temp ≥39°C (102.2°F) OR moderate–severe otalgia OR otalgia ≥48 hours OR toxic appearance.

Always treat with antibiotics:

Watchful waiting (observation) option if reliable follow-up and pain control:

Mechanics of observation:

Rationale: 60–80% of AOM resolves spontaneously; antibiotics provide modest benefit (NNT ~7 for pain at day 2–3) at cost of diarrhea, rash, resistance, candidiasis.

Pain control is mandatory regardless of antibiotic decision:

Antibiotics are not indicated for OME (effusion without inflammation), even if hearing is reduced.

Pharmacotherapy — First-Line Antibiotic Regimens

— High dose overcomes intermediate-resistance pneumococcus

— Cheap, narrow spectrum, palatable, well-tolerated

— Antibiotics within prior 30 days

— Concurrent purulent conjunctivitis (H. influenzae predictor)

— Recurrent AOM unresponsive to amoxicillin

— History of AOM unresponsive to amoxicillin in past

— Non-severe (rash, no anaphylaxis): cefdinir 14 mg/kg/day, cefuroxime 30 mg/kg/day, cefpodoxime 10 mg/kg/day, or single-dose IM/IV ceftriaxone 50 mg/kg × 1–3 doses (cross-reactivity with later-generation cephalosporins <1%)

— Severe (anaphylaxis, SJS, DRESS): macrolide (azithromycin) or clindamycin — but pneumococcal macrolide resistance now 30–40%, so suboptimal; consider levofloxacin in select cases

— <2 years or severe: 10 days

— 2–5 years, non-severe: 7 days

— ≥6 years, non-severe: 5–7 days

— Amoxicillin → switch to amoxicillin-clavulanate

— Amox-clav failure → ceftriaxone 50 mg/kg IM/IV daily × 3 days ± tympanocentesis for culture

— Persistent failure → ENT for tympanocentesis, consider clindamycin + third-gen cephalosporin

— Complete the course (or short course as prescribed)

— Expect symptom improvement in 48–72 h

— Diarrhea is the most common adverse effect

— Avoid concurrent decongestants/antihistamines (no benefit, sedation risk)

Board pearl: "AOM + conjunctivitis" = amoxicillin-clavulanate up front, not amoxicillin. The classic Step 3 trap is choosing high-dose amoxicillin when H. influenzae is being signaled.

First-line: high-dose amoxicillin 80–90 mg/kg/day PO divided BID × 10 days (<2 yrs or severe); 5–7 days may suffice in ≥6 years with mild–moderate disease.

First-line: amoxicillin-clavulanate (high-dose) 90 mg/kg/day amoxicillin component divided BID × 10 days when:

Penicillin allergy management — clarify reaction type:

Treatment duration:

Treatment failure (no improvement at 48–72 h):

Counsel families:

Adjunctive Therapy and Tympanostomy Tubes

— Scheduled (not PRN) ibuprofen + acetaminophen for first 48 h

— Warm compresses

— Topical anesthetic drops if TM intact (limited evidence)

— Avoid aspirin (Reye syndrome) and codeine/tramadol (FDA contraindicated <12 yrs)

— Oral or topical decongestants — no benefit, sympathomimetic side effects

— Antihistamines — prolong effusion

— Systemic corticosteroids — no benefit

— Complementary/alternative therapies (echinacea, homeopathy) — no evidence

— Indication: bilateral OME ≥3 months with documented hearing loss ≥25 dB OR speech/language delay

— Indication: recurrent AOM (≥3 episodes in 6 mo or ≥4 in 12 mo with one in last 6 mo) AND persistent MEE at time of evaluation

— Without persistent MEE, tubes for recurrent AOM are not routinely recommended (AAO-HNS 2022 update)

— Procedure: outpatient myringotomy under general anesthesia; tubes extrude spontaneously in 6–18 months

— Benefits: hearing restoration, fewer AOM episodes, ability to treat AOM with topical drops

— Risks: persistent perforation (1–2%), tympanosclerosis, otorrhea, anesthesia risks

— Ofloxacin or ciprofloxacin-dexamethasone drops — quinolones are safe for middle ear (do not use neomycin/polymyxin which are ototoxic)

— Often first-line over oral antibiotics for uncomplicated tube otorrhea

Step 3 management: A child with tympanostomy tubes who develops otorrhea = topical ofloxacin drops, not oral antibiotics. Oral antibiotics are reserved for systemic illness or treatment failure.

Pain management is core therapy, not optional:

Therapies not recommended:

Tympanostomy (pressure-equalization) tubes:

Topical antibiotic drops for AOM with tympanostomy tubes or with TM perforation:

Adenoidectomy considered for recurrent OME/AOM in children ≥4 years, especially with nasal obstruction symptoms.

Prevention strategies that work: PCV13/15/20, annual influenza vaccine, breastfeeding ≥6 months, smoke avoidance, eliminate pacifier after 6 months, xylitol (modest effect).

Special Populations — Hepatic, Renal, and Antibiotic-Allergic Patients

— Amoxicillin is renally cleared — adjust if CrCl <30 mL/min (extend interval to q12h or q24h); rarely relevant in otherwise healthy children

— Amoxicillin-clavulanate: avoid the extra-strength (XR) formulation in CrCl <30 mL/min due to clavulanate accumulation

— Ceftriaxone: no renal adjustment but avoid in neonates with hyperbilirubinemia (displaces bilirubin from albumin → kernicterus) and avoid coadministration with IV calcium-containing fluids in any neonate (precipitation)

— Amoxicillin-clavulanate is the most common cause of antibiotic-associated cholestatic hepatitis; risk rises with age and repeated courses. Counsel on jaundice, dark urine, RUQ pain.

— Azithromycin rarely associated with cholestatic hepatitis

— Mild delayed rash without urticaria: cephalosporins safe; consider penicillin allergy delabeling via skin testing or oral challenge — most "PCN allergic" children are not truly allergic

— Urticaria, angioedema, anaphylaxis: avoid all beta-lactams initially; use macrolide or clindamycin; allergy referral for testing

— SJS/TEN, DRESS, AIN: lifelong avoidance of all beta-lactams; no skin testing

Key distinction: Most reported "penicillin allergy" in children is not true allergy — Step 3 favors penicillin allergy delabeling as a high-value, antimicrobial-stewardship intervention before defaulting to broader-spectrum antibiotics.

Renal dose adjustment in pediatric AOM is uncommon but tested:

Hepatic considerations:

Penicillin allergy stratification (high-yield):

G6PD deficiency: avoid sulfa-based options if alternatives considered.

Children with cochlear implants: AOM is a medical urgency given meningitis risk through implant tract → treat with antibiotics immediately, low threshold for ENT consultation, ensure PCV20 + meningococcal vaccination per ACIP.

Down syndrome: anatomic eustachian tube dysfunction → recurrent AOM and chronic OME nearly universal → audiology surveillance and early tube placement.

Special Populations — Neonates, Pregnancy, and Immunocompromised

— Atypical pathogens: GBS, gram-negative enterics, S. aureus alongside typical organisms

— Admit, full sepsis workup (blood, urine, CSF), IV ampicillin + gentamicin or cefotaxime

— Tympanocentesis often performed for culture-directed therapy

— Apply febrile-infant pathways (Rochester/PECARN/AAP 2021)

— If well-appearing with reassuring inflammatory markers and negative UA → may treat AOM as outpatient with close follow-up

— If any risk factor or ill-appearing → admit, blood + urine ± CSF, empiric IV antibiotics

— Amoxicillin and amoxicillin-clavulanate = pregnancy category B, first-line

— Cephalosporins safe in pregnancy

— Avoid doxycycline (fetal tooth/bone), avoid fluoroquinolones (cartilage), avoid sulfonamides in third trimester (kernicterus)

— Azithromycin acceptable if penicillin-allergic

— Lower threshold for tympanocentesis and culture-directed therapy

— Broader empiric coverage; consider Pseudomonas in chronic suppurative otitis media

— More aggressive imaging for complications

— Higher rates of recurrent disease — work up humoral immunity (Ig levels, vaccine responses)

Board pearl: A febrile neonate with a bulging TM is not "just an ear infection" — admit and do the full sepsis workup. Missing occult bacteremia or meningitis in this age group is the classic miss.

Neonates (<1 month) with AOM:

Infants 1–3 months with AOM and fever:

Pregnancy — adult AOM is much less common but board-relevant:

Immunocompromised hosts (HIV, post-transplant, primary immunodeficiency, sickle cell, chemotherapy):

Sickle cell disease: functional asplenia → S. pneumoniae overgrowth → ensure PCV20 + PPSV23 + penicillin prophylaxis age-appropriate; treat AOM promptly.

Cochlear implant recipients: AOM in first 2 months post-implant = surgical emergency for ENT (risk of bacterial meningitis); always ensure pneumococcal vaccination per ACIP recipient schedule.

Cleft palate, Down syndrome, craniofacial syndromes: chronic eustachian tube dysfunction → low threshold for early tympanostomy tubes and audiology surveillance.

Complications and Adverse Outcomes

— Acute mastoiditis: postauricular erythema, swelling, tenderness, protrusion of the auricle, fever. CT with contrast shows coalescent mastoid air cells ± subperiosteal abscess. Treatment: IV ceftriaxone (or ampicillin-sulbactam) + ENT consult; myringotomy ± mastoidectomy for abscess or failure.

— TM perforation: usually heals spontaneously in 1–2 weeks; persistent perforation >3 months → ENT for tympanoplasty

— Chronic suppurative otitis media (CSOM): persistent otorrhea >6 weeks through perforation; often Pseudomonas/S. aureus → topical ofloxacin drops

— Cholesteatoma: keratin-debris cyst of middle ear from chronic retraction or perforation; presents as painless otorrhea + conductive hearing loss + white mass on TM; ENT surgical referral

— Facial nerve palsy: from inflammation of dehiscent facial canal → urgent myringotomy + IV antibiotics

— Labyrinthitis: vertigo, sensorineural hearing loss, nystagmus

— Petrositis (Gradenigo syndrome): triad of otorrhea + retro-orbital pain (CN V) + lateral rectus palsy (CN VI)

— Meningitis — most common intracranial complication; S. pneumoniae predominant

— Epidural, subdural, or brain abscess (often temporal lobe or cerebellum)

— Lateral/sigmoid sinus thrombosis — fever, headache, picket-fence pattern, papilledema; MRI/MRV diagnostic; treat with IV antibiotics ± anticoagulation

— Otitic hydrocephalus — increased ICP from sinus thrombosis

— Persistent OME with conductive hearing loss → speech and language delay

— Vestibular dysfunction

CCS pearl: Postauricular swelling + protruding ear after AOM = acute mastoiditis — order CT temporal bones with contrast, start IV ceftriaxone, and consult ENT simultaneously. Do not wait for imaging to start antibiotics in a toxic child.

Intratemporal complications:

Intracranial complications (rare but exam-favorite):

Functional/developmental complications:

Antibiotic-related: diarrhea, candidiasis, allergic reactions, C. difficile (rare), resistance selection.

When to Escalate — Admission, Consult, and Subspecialty Triage

— <3 months with fever (regardless of AOM diagnosis)

— Toxic appearance, sepsis physiology, hypotension, altered mental status

— Inability to tolerate oral medications/fluids

— Suspected suppurative complication: mastoiditis, meningitis, intracranial abscess, sinus thrombosis, facial palsy

— Treatment failure after second-line oral antibiotics in young or immunocompromised child

— Immunocompromised host with severe AOM

— Cochlear implant recipient with AOM in first 2 months post-implant

— Suspected or confirmed mastoiditis, cholesteatoma, persistent perforation, suppurative complications

— Recurrent AOM meeting criteria for tympanostomy tubes

— Persistent OME ≥3 months bilateral with hearing loss

— Treatment failure requiring tympanocentesis

— Craniofacial anomaly with chronic ear disease

— Any child with OME ≥3 months

— Speech/language delay with history of recurrent AOM

— Pre- and post-tympanostomy tube assessment

— Documented language delay attributable to chronic conductive hearing loss

— Intracranial abscess, sigmoid sinus thrombosis with mass effect, otitic hydrocephalus

— Document reliable follow-up plan within 48–72 hours for watchful-waiting cases

— Provide written safety-net prescription and clear return precautions

Step 3 management: A toddler 4 days into amoxicillin who now has fever, postauricular tenderness, and a protruding auricle = admit, IV ceftriaxone, CT temporal bones, ENT consult. Outpatient antibiotic switch is the wrong answer here.

Outpatient management suffices for uncomplicated AOM in immunocompetent children >3 months with reliable caregivers.

Admit for IV antibiotics and inpatient management when:

ENT consultation indicated for:

Audiology referral:

Speech-language pathology:

Neurosurgery:

Disposition logistics:

Key Differentials — Other Otologic Causes of Ear Pain

— MEE without acute inflammation; TM retracted or neutral, not bulging

— Hearing loss without significant pain or fever

— No antibiotics; observation with audiology surveillance; tubes if persistent ≥3 mo with hearing loss

— Pain with tragal traction or auricle manipulation

— Edematous, erythematous external canal with debris; TM often normal or obscured

— Pseudomonas and S. aureus predominant

— Treatment: topical antibiotic drops (ofloxacin or ciprofloxacin-dexamethasone); keep ear dry

— Malignant (necrotizing) otitis externa in diabetic/immunocompromised — Pseudomonas invasion of skull base → IV anti-pseudomonal therapy + imaging

— Painful vesicles on TM, often viral or mycoplasma-associated; manage as AOM if MEE present

— Painless otorrhea, conductive hearing loss, white pearly mass; surgical

— Ear fullness, popping, mild hearing change without infection signs

— Often post-URI or in allergic rhinitis

— Conservative: nasal steroids, autoinflation; antibiotics not indicated

— Pain after air travel, diving; hemotympanum possible; supportive care

— Trauma (Q-tip, slap), barotrauma; clean ear precautions; ENT if not healed in 3 months

— Toddlers; visualized on otoscopy; removal under direct visualization

— Dental abscess, pharyngitis, TMJ dysfunction, cervical lymphadenitis — exam normal ear with pain referred via CN V, VII, IX, X

Key distinction: Pain with tragal traction + edematous canal = otitis externa → topical drops. Pain with bulging TM + fever = AOM → systemic antibiotics or observation per algorithm. Mixing these up changes the entire prescription.

Otitis media with effusion (OME):

Otitis externa ("swimmer's ear"):

Bullous myringitis:

Cholesteatoma:

Mastoiditis: complication of AOM (see chunk 11)

Eustachian tube dysfunction:

Barotrauma:

TM perforation without AOM:

Foreign body:

Referred otalgia:

Key Differentials — Systemic and Non-Otologic Mimics

— Fever, rhinorrhea, fussiness without MEE or bulging TM

— Erythematous TM from crying is not AOM

— Supportive care only; no antibiotics

— School-age child with fever, sore throat, tender anterior cervical nodes, exudative tonsils

— Pain may refer to ear via CN IX; ear exam should be normal

— Rapid strep + culture if positive triggers PCN VK or amoxicillin × 10 days

— Toddler with localized jaw swelling, drooling, refusal to eat; ear exam normal

— Pain referred to ear via CN V

— ≥10 days persistent symptoms, worsening course, or severe onset with high fever + purulent rhinorrhea ≥3 days

— Amoxicillin or amoxicillin-clavulanate; overlapping pathogens with AOM

— Older children/adolescents; preauricular pain, exam findings localize to joint or parotid

— Postauricular swelling without prior AOM history possible; CT diagnostic

— Stiff neck, drooling, torticollis; lateral neck imaging

— Fever + irritability + bulging fontanelle (infant) or meningismus (older child); not all meningitis follows AOM but always on the differential in a toxic child

— Fever ≥5 days + conjunctivitis + rash + extremity changes + cervical adenopathy + mucositis; ear findings absent

— Unilateral purulent rhinorrhea or otorrhea in a toddler

Board pearl: A crying febrile toddler with a red TM but no bulging or effusion has a viral URI, not AOM. Antibiotics in this scenario are the wrong answer and are the leading driver of unnecessary pediatric antibiotic exposure and parental expectation mismatch.

Viral URI alone:

Streptococcal pharyngitis:

Dental abscess / erupting molars:

Sinusitis (acute bacterial):

TMJ dysfunction / parotitis:

Mastoiditis as primary presentation:

Cervical lymphadenitis or retropharyngeal abscess:

Meningitis:

Kawasaki disease:

Foreign body in nose or ear:

Secondary Prevention and Long-Term Plan

— Tobacco smoke exposure: counsel caregivers on cessation; reduce risk of AOM and OME by ~50%

— Daycare attendance: limit group size if feasible (smaller daycares ↓ exposure); not always practical

— Pacifier use: discourage after 6 months

— Supine bottle-feeding: avoid; promote upright feeding

— Breastfeeding ≥6 months: protective against AOM

— PCV15 or PCV20 at 2, 4, 6, 12–15 months (2023 ACIP update)

— Hib at 2, 4, 6, 12–15 months

— Annual influenza vaccine age ≥6 months — reduces AOM episodes by 30%

— Catch-up per ACIP if delayed

— Antibiotic prophylaxis is no longer recommended routinely (resistance > benefit)

— Tympanostomy tubes for recurrent AOM with persistent MEE at evaluation

— Consider adenoidectomy in children ≥4 years with recurrent disease

— Reassess at 3-month intervals

— Audiometry; if hearing loss ≥25 dB bilateral or speech delay → tubes

— Watchful waiting acceptable if no hearing/language concerns

— Many AOM episodes resolve without antibiotics

— Antibiotics do not shorten effusion duration after acute illness

— Antihistamines/decongestants do not prevent recurrence

— Discuss expected language milestones

— Document baseline hearing if recurrent disease

Step 3 management: A 2-year-old with 4 AOM episodes this year but a clear TM today = counsel on prevention, ensure PCV20 + flu vaccine, do not start prophylactic antibiotics, refer to ENT to discuss tubes if recurrent episodes continue with MEE on next exam.

Address modifiable risk factors at every visit:

Ensure immunizations are up-to-date:

Recurrent AOM management:

Persistent OME monitoring:

Counsel on prudent antibiotic use:

Address parental concerns:

Follow-Up, Monitoring, and Counseling

— 48–72 hours if no improvement (caregiver-initiated return) — escalate antibiotics

— 2–3 weeks post-treatment to assess for resolution of effusion and exclude complications (especially in <2 years or recurrent)

— Effusion can persist up to 3 months after AOM resolution — this is OME, not treatment failure, and does not warrant additional antibiotics

— Provide safety-net antibiotic prescription with instructions to fill only if no improvement at 48–72 hours

— OR scheduled in-person reassessment in 48–72 hours

— Ensure caregiver has access to acetaminophen/ibuprofen and understands return precautions

— Persistent bilateral OME ≥3 months → audiometry

— Hearing loss ≥25 dB or speech/language concern → ENT for tube discussion

— Track developmental milestones at well-child visits

— Expected course: pain improves in 24–48 hours, fever resolves by day 3

— Return precautions: persistent or worsening fever after 72 h, lethargy, postauricular swelling, neck stiffness, severe headache, persistent vomiting

— Pain control regimen

— Anticipated post-AOM effusion and its benign course

— Importance of completing antibiotic course as prescribed

— Diagnostic criteria met (bulging TM, MEE, acute onset)

— Severity classification (severe vs non-severe)

— Antibiotic vs observation rationale (shared decision-making note)

— Allergy reconciliation

— Follow-up plan and safety-net education

— Address concerns about "antibiotic shortages" or resistance — explain stewardship rationale

Board pearl: Persistent middle ear effusion after treated AOM is expected — 70% have MEE at 2 weeks, 40% at 1 month, 10% at 3 months. Do not re-treat asymptomatic post-AOM effusion with another antibiotic course.

Standard follow-up cadence for treated AOM:

Watchful-waiting follow-up:

Monitor for hearing and language:

Caregiver counseling points (document):

Documentation requirements (Step 3 health-systems flavor):

Adult learners/parents:

Ethical, Legal, and Patient Safety Considerations

— Overprescribing in AOM is a leading driver of pediatric antibiotic resistance and adverse drug events (rash, diarrhea, C. difficile, anaphylaxis)

— Watchful waiting with shared decision-making is evidence-based and ethically appropriate — document the conversation

— Avoid prescribing when diagnosis is not met (no bulging, no MEE) even under parental pressure; counsel on viral URI expectations

— Explain spontaneous resolution rates and modest antibiotic benefit

— Document caregiver understanding and chosen course

— SDM is a recognized Step 3 competency

— Provide written prescription to fill only if no improvement in 48–72 h

— Reduces antibiotic use by ~30% without increasing complications

— Counsel on signs that warrant immediate evaluation rather than self-treatment

— Discuss anesthesia risks, tube extrusion, persistent perforation, tympanosclerosis

— In children, both parents' assent is best practice; legal authority typically rests with one custodial parent; assent of older child ≥7

— Discharging from ED or urgent care without ensuring primary care follow-up within 48–72 h is a documented patient-safety gap; provide direct referral and after-hours contact

— Communicate ENT referrals via closed-loop documentation

— Use professional interpreters for non-English-speaking families — ad hoc family interpreters violate joint commission standards and risk medication errors

— Provide written instructions at appropriate reading level

— Recurrent unexplained TM perforation or hemotympanum without clear barotrauma history should prompt consideration of non-accidental trauma; document carefully and report per state law

— Lower-income families face barriers to follow-up; consider liquid-formulation cost, transportation, and clinic access when choosing observation vs prescription

Step 3 management: When parents demand antibiotics for a viral URI with no AOM criteria, counsel and decline antibiotics, document SDM, and provide written symptomatic-care instructions and return precautions — yielding to pressure is a stewardship failure and a Step 3 wrong answer.

Antimicrobial stewardship is a patient-safety priority:

Shared decision-making (SDM) in the 6–23 month unilateral non-severe AOM case:

Safety-net antibiotic prescriptions (SNAPs):

Informed consent for tympanostomy tubes:

Transition-of-care risks:

Language access and health literacy:

Mandatory reporting:

Equity considerations:

High-Yield Associations and Rapid-Fire Facts

Board pearl: When the stem mentions a child who "completed amoxicillin 2 weeks ago" and now has a new AOM episode, the recent-antibiotic rule applies → start amoxicillin-clavulanate, not repeat amoxicillin.

Top three pathogens: S. pneumoniae > non-typeable H. influenzae > Moraxella catarrhalis. Group A strep uncommonly causes AOM but classically causes spontaneous perforation.

AOM + conjunctivitis = non-typeable H. influenzae → amoxicillin-clavulanate up front.

High-dose amoxicillin = 80–90 mg/kg/day divided BID. High-dose amox-clav = 90 mg/kg/day amoxicillin component.

Severe AOM = temp ≥39°C, moderate-severe pain, otalgia ≥48 h, or toxic appearance.

Always treat: <6 mo, bilateral AOM in 6–23 mo, severe AOM at any age, otorrhea at any age.

Observation option: unilateral non-severe AOM age 6–23 mo, or any AOM ≥24 mo if non-severe and reliable follow-up.

Duration: <2 yrs or severe → 10 days; 2–5 yrs non-severe → 7 days; ≥6 yrs non-severe → 5–7 days.

Treatment failure at 48–72 h on amoxicillin → amoxicillin-clavulanate.

Failure on amox-clav → ceftriaxone IM/IV × 3 days ± tympanocentesis.

Topical ofloxacin drops for AOM through tympanostomy tubes or perforation; avoid ototoxic neomycin.

Tympanostomy tube indications: bilateral OME ≥3 mo with hearing loss ≥25 dB or language delay; recurrent AOM with persistent MEE.

Recurrent AOM: ≥3 in 6 mo or ≥4 in 12 mo with one in last 6 mo.

Mastoiditis triad: postauricular swelling + protruding auricle + fever after AOM → CT + IV ceftriaxone + ENT.

Gradenigo syndrome: otorrhea + retro-orbital pain (V) + lateral rectus palsy (VI) = petrositis.

Cholesteatoma: painless otorrhea + white retraction-pocket mass + conductive hearing loss → surgical.

Bullous myringitis: vesicles on TM — manage like AOM.

Effusion can persist 3 months post-AOM and is benign — do not re-treat.

PCV20, Hib, annual flu reduce AOM incidence; smoke exposure doubles risk.

Codeine and tramadol contraindicated <12 yrs for pain (FDA boxed warning).

Ceftriaxone contraindicated with IV calcium in neonates and in hyperbilirubinemia.

Board Question Stem Patterns

— 18-month-old with 1 day of fussiness, low-grade fever 38.3°C, R-sided unilateral bulging TM with effusion, reliable family. Answer: shared decision-making, observation option with safety-net Rx, follow-up in 48–72 h.

— 14-month-old with bilateral bulging TMs, T 38.5°C. Answer: high-dose amoxicillin × 10 days (bilateral AOM in 6–23 mo always treated).

— 3-year-old with otalgia, bulging TM, purulent conjunctivitis. Answer: amoxicillin-clavulanate (not amoxicillin) — H. influenzae predicted.

— 2-year-old finished amoxicillin for AOM 2 weeks ago, now new bulging TM. Answer: high-dose amoxicillin-clavulanate.

— 18-month-old, day 3 of amoxicillin, still febrile with bulging TM. Answer: switch to amoxicillin-clavulanate.

— Toddler with postauricular swelling, fever, protruding auricle. Answer: admit, IV ceftriaxone, CT temporal bones, ENT consult.

— School-age child with hearing loss, neutral non-bulging TM with air-fluid level, no pain or fever. Answer: OME — observation, audiometry; no antibiotics.

— Answer: cefdinir or single-dose IM ceftriaxone (cross-reactivity <1%).

— Answer: macrolide (azithromycin) or clindamycin, with awareness of resistance.

— Febrile 3-week-old with bulging TM. Answer: full sepsis workup + admit + IV antibiotics.

— Pain with tragal traction, swollen canal, normal mobile TM. Answer: topical ofloxacin drops.

— Child with tympanostomy tubes develops otorrhea, afebrile. Answer: topical ofloxacin (not oral).

— 6 weeks post-AOM, asymptomatic, MEE on exam. Answer: observation, reassess at 3 months.

Key distinction: The question stem always tells you laterality, age, severity, recent antibiotics, and allergies — these five variables drive the algorithm completely. Read them first.

Pattern 1 — Watchful waiting decision:

Pattern 2 — Must-treat scenario:

Pattern 3 — AOM + conjunctivitis:

Pattern 4 — Recent antibiotics:

Pattern 5 — Treatment failure:

Pattern 6 — Mastoiditis:

Pattern 7 — OME mislabeled as AOM:

Pattern 8 — Penicillin allergy with mild rash history:

Pattern 9 — True anaphylaxis to penicillin:

Pattern 10 — Neonate with AOM:

Pattern 11 — Otitis externa mimicker:

Pattern 12 — Tube otorrhea:

Pattern 13 — Persistent post-AOM effusion:

One-Line Recap

Acute otitis media is a clinical diagnosis requiring a bulging TM (or otorrhea) with middle ear effusion, managed with high-dose amoxicillin first-line, with watchful waiting reserved for unilateral non-severe disease in children ≥6 months who have reliable follow-up.

Step 3 management: Read age, laterality, severity, recent antibiotics, and allergy status first — those five variables drive the entire AOM algorithm, and Step 3 stems plant every one of them in the question for a reason.

Diagnosis: bulging TM + MEE + acute onset; pneumatic otoscopy is the bedside gold standard; red TM alone is not AOM.

Antibiotics always for <6 mo, bilateral AOM 6–23 mo, severe AOM at any age, or otorrhea; observation acceptable for unilateral non-severe 6–23 mo and most non-severe ≥24 mo with shared decision-making and 48–72 h follow-up.

First-line: high-dose amoxicillin (80–90 mg/kg/day) × 10 days under 2 or severe, 7 days for 2–5 yrs, 5–7 days for ≥6 yrs; switch to amoxicillin-clavulanate if concurrent conjunctivitis, antibiotics in past 30 days, or amoxicillin failure at 48–72 h.

Escalate for mastoiditis (postauricular swelling, protruding auricle), suspected intracranial extension, neonates, immunocompromise, or treatment failure on second-line therapy; refer to ENT for recurrent AOM with persistent MEE or chronic OME with hearing loss/language delay.