Acute Otitis Media in Childhood

For Pharmacy Examining Board of Canada (PEBC) MCQ and EE Preparation

Introduction

Acute otitis media (AOM) is a common infection of the middle ear, primarily affecting young children. It is one of the most frequent causes of physician visits in primary care, often presenting as fever, irritability, and ear pain (otalgia). Understanding the management, diagnosis, and treatment options for AOM is essential for success in both the MCQ and EE components of the PEBC exams.

AOM typically follows an upper respiratory tract infection (often viral), which disrupts mucociliary clearance and predisposes the middle ear to bacterial invasion. Bacterial pathogens like Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis are common culprits.

 

Goals of Therapy

The management of AOM should focus on:

1.    Relieving symptoms (pain, fever, irritability).

2.    Eradicating the infection by targeting the causative organism.

3.    Preventing complications, such as mastoiditis, facial paralysis, or intracranial infection.

4.    Minimizing antibiotic overuse, which can lead to resistant bacterial strains.

 

1. History

●      Symptoms: Fever, irritability, ear pain (otalgia), and respiratory symptoms (runny nose, cough).

●      Duration: Symptoms usually last 2–3 days, but untreated AOM can persist or worsen.

2. Physical Examination

●      Otoscopic Findings: A red, bulging, opaque, immobile tympanic membrane suggests AOM.

●      Middle Ear Effusion: Necessary for diagnosis; fluid behind the eardrum often leads to discomfort or hearing loss.

3. Referral Indications

●      Recommended for children ≥6 months with non-severe illness (fever <39°C, mild pain).

●      If symptoms are expected to resolve within 48 hours, delay antibiotic use while providing appropriate analgesia.

●      Educate caregivers about signs of worsening symptoms and when to seek further medical attention.

Pharmacologic Choices

Analgesics

●      Acetaminophen: 10–15 mg/kg every 4–6 hours (max 75 mg/kg/day, or 4000 mg/day).

●      Ibuprofen: 10 mg/kg every 6–8 hours (max 40 mg/kg/day, or 2400 mg/day).

Antibiotics: Empiric therapy should be initiated in cases where AOM is suspected. First-line and alternative options are summarized in the following tables.

 Table 1: Antibiotic Treatment Recommendations for Acute Otitis Media

Age Group	First-Line Antibiotics	Alternatives (if Failure by Day 3–9)	Alternatives (if Failure by Day 10–28)
< 6 weeks	Refer to emergency for assessment.	N/A	N/A
6 weeks–6 months	High-dose amoxicillin (75–90 mg/kg/day for 10 days)	Amoxicillin/clavulanate (HD), cefprozil, cefuroxime, ceftriaxone	Repeat amoxicillin/clavulanate, consider tympanocentesis
≥ 6 months (no risk factors)	Standard or high-dose amoxicillin for 5–10 days based on age	Amoxicillin/clavulanate (HD), cefprozil, cefuroxime, ceftriaxone	Repeat amoxicillin/clavulanate, consider tympanocentesis
≥ 6 months (with risk factors)	High-dose amoxicillin (75–90 mg/kg/day for 10 days)	Amoxicillin/clavulanate (HD), cefprozil, cefuroxime, ceftriaxone	Repeat amoxicillin/clavulanate, consider tympanocentesis
Recurrent AOM	Refer to ENT; consider vaccination.	Amoxicillin/clavulanate (HD), ceftriaxone	Repeat course, consider tympanocentesis
Penicillin Allergy	Cefuroxime, clarithromycin, azithromycin	Clindamycin or levofloxacin	Levofloxacin (after infectious disease consult)

 

Table 2: Key Considerations in Antibiotic Therapy for AOM

Antibiotic	Dose	Adverse Effects	Comments
Amoxicillin	Standard: 40–50 mg/kg/day TID or BID	Diarrhea, rash (viral vs. allergic differentiation)	First-line; excellent safety profile
Amoxicillin/Clavulanate	75–90 mg/kg/day divided BID	Diarrhea more common with high doses	Use in treatment failure/resistant strains
Cefuroxime axetil (Ceftin)	30 mg/kg/day divided BID	Bitter taste, GI upset	Use in penicillin allergy cases
Azithromycin (Zithromax)	Day 1: 10 mg/kg, Days 2–5: 5 mg/kg/day	Low GI upset	Use in penicillin allergy, short course
Clindamycin (Dalacin C)	30 mg/kg/day divided TID	Nausea, vomiting, diarrhea, rash	Use for penicillin allergy; does not cover H. influenzae
Ceftriaxone	50 mg/kg IM/IV daily for 3 days	Pain at injection site	Second-line agent for non-responsive cases

 

Table 3: Watchful Waiting and Risk Factor–Based Management Algorithm

 

Step	Action
1. Initial Diagnosis	History of acute onset ear pain, fever, irritability.
2. Otoscopic Findings	Red, bulging, opaque tympanic membrane.
3. Is the child <6 weeks old?	Yes: Refer to the emergency department. No: Continue below.
4. Child is ≥6 months old	Watchful waiting with analgesia for 48 hours if no severe illness or risk factors.
5. Child <6 months old or presents with severe illness	Amoxicillin for 10 days; consider high dose if resistance is suspected.
6. Evaluate Response	If improvement within 72 hours, continue therapy for 5–10 days.
7. No Improvement After 72 Hours	Consider alternative agents (amoxicillin/clavulanate, cefuroxime, ceftriaxone).
8. Consider Tympanocentesis	For recurrent or persistent cases despite antibiotic treatment.

 

Prevention

Vaccination

• ●      Pneumococcal Conjugate Vaccine: Has reduced the incidence of AOM caused by Streptococcus pneumoniae.
• ●      Influenza Vaccine: Reduces the risk of viral upper respiratory infections that predispose to AOM.

Risk Factor Modification

• ●      Avoid Tobacco Smoke: Secondhand smoke exposure increases the risk of AOM.
• ●      Breastfeeding: Reduces respiratory tract colonization and subsequent AOM risk in infants.

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