Acute Bacterial Sinusitis Management in Children

Diagnosis – Clinical Criteria for Bacterial Sinusitis

Persistent illness is defined by nasal discharge or daytime cough lasting ≥ 10 days without improvement. 1
Severe illness is defined by fever ≥ 39 °C (102.2 °F) for ≥ 3 consecutive days together with thick, colored nasal discharge. 5
Worsening illness is identified by an initial improvement from a viral cold followed by new fever ≥ 38 °C (100.4 °F) or increased cough/nasal discharge. 1
True bacterial sinusitis develops in fewer than 1 in 15 children with common‑cold symptoms. 5

Severe or worsening illness – immediate antibiotic therapy is mandatory; observation is not appropriate. 2
Persistent illness – two equally acceptable strategies:
- Immediate amoxicillin (45–90 mg/kg/day divided BID). 2
- Observation for an additional 3 days, initiating antibiotics only if symptoms fail to improve or worsen. 1
The number needed to treat (NNT) with antibiotics for persistent illness is 3–5, reflecting that many children improve spontaneously. 1

Standard‑dose amoxicillin (45 mg/kg/day) is recommended for children without recent antibiotic exposure, daycare attendance, or age < 2 years. 2
High‑dose amoxicillin‑clavulanate (90 mg/kg/day amoxicillin component) is advised for children with risk factors for resistant Streptococcus pneumoniae. 2
The predominant bacterial pathogens are S. pneumoniae (≈ 30 %), non‑typeable Haemophilus influenzae (≈ 20 %), and Moraxella catarrhalis (≈ 20 %). 2

A single dose of ceftriaxone 50 mg/kg IM or IV followed by oral therapy after clinical improvement. 6

Total antibiotic course of 10–14 days, or at least 7 days after symptom resolution. 6
Reassess if symptoms worsen at any time or fail to improve after 72 hours of therapy; consider changing the antibiotic or initiating therapy if previously observing. 6

Intranasal corticosteroids may improve outcomes, especially when allergic rhinitis co‑exists. 7
Saline nasal irrigation (non‑spray) combined with antibiotics has shown clinical benefit in pediatric studies. 7
Antihistamines are not indicated as primary treatment but may help concurrent allergic symptoms. 7
Oral/topical decongestants and mucolytics are not recommended due to insufficient supporting data. 7

Orbital complications (e.g., swollen eye, proptosis, limited extra‑ocular movements) – most common in children < 5 years with ethmoid sinusitis. Obtain contrast‑enhanced CT or MRI immediately. 1
Intracranial complications (severe headache, photophobia, seizures, focal neurologic deficits) – also mandate urgent contrast‑enhanced CT or MRI. 4

Do not obtain plain radiographs, CT, MRI, or ultrasound to differentiate bacterial from viral sinusitis in uncomplicated cases. 6
Do not use trimethoprim‑sulfamethoxazole or azithromycin for penicillin‑allergic patients because of high resistance rates. 6
Do not prescribe fluoroquinolones to children due to musculoskeletal safety concerns. 8