A 32-year-old woman presents with a 3-week history of purulent nasal discharge, facial pain over the cheeks, and post-nasal drip. She reports that symptoms began after an upper respiratory tract infection. On examination, there is tenderness over the maxillary sinuses bilaterally, and nasal endoscopy reveals purulent discharge from the middle meatus. CT scan of the paranasal sinuses shows opacification of the maxillary sinuses with air-fluid levels and mucosal thickening. She has been on amoxicillin-clavulanate for 10 days with minimal improvement. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis **Key Point:** This patient has acute bacterial sinusitis (maxillary) that is not responding to first-line antibiotic therapy after 10 days. ## Management Approach for Acute Sinusitis ### First-Line Management - Nasal saline irrigation and decongestants (topical or oral) - First-line antibiotics: amoxicillin-clavulanate or cefuroxime - Duration: 7–14 days ### Second-Line Management (Treatment Failure) When symptoms persist or worsen after 7–10 days of appropriate therapy: | Feature | First-Line | Second-Line | |---------|-----------|-------------| | Antibiotics | Amoxicillin-clavulanate | Fluoroquinolone (levofloxacin, moxifloxacin) | | Adjunct | Saline irrigation | Saline irrigation + topical decongestant | | Duration | 7–14 days | 10–14 days | | Surgery | Not indicated | Consider if no improvement in 3–4 weeks | **High-Yield:** The term "treatment failure" in acute sinusitis is defined as: - Persistence of symptoms beyond 7–10 days despite appropriate antibiotics - Worsening symptoms during treatment - Complications (orbital, intracranial) **Clinical Pearl:** Fluoroquinolones (levofloxacin, moxifloxacin) have excellent sinus penetration and cover both gram-positive and gram-negative organisms, making them ideal for second-line therapy. ## Why Surgery Is Not Indicated Yet 1. No signs of complications (no proptosis, diplopia, meningeal signs) 2. No evidence of chronic sinusitis (only 3 weeks of symptoms) 3. FESS is reserved for chronic sinusitis or acute sinusitis with complications ## Why Systemic Antibiotics Are Not Indicated - No fever, no signs of sepsis - No orbital or intracranial involvement - Oral antibiotics are sufficient for uncomplicated acute sinusitis [cite:Bhattacharyya N et al. Acute Bacterial Rhinosinusitis, American Academy of Otolaryngology–Head and Neck Surgery, 2015]