In a 29-year-old man with recurrent facial pain, nasal congestion, clear nasal discharge, and now fever and unilateral maxillary tenderness after initial improvement, what is the best next step in management?

Start Antibiotic Therapy

This patient meets criteria for acute bacterial rhinosinusitis (ABRS) and should be started on antibiotic therapy immediately. 1

Clinical Reasoning

This 29-year-old man presents with classic "double worsening" (also called "double sickening"), which is one of the three cardinal presentations that distinguish ABRS from viral rhinosinusitis:

• Initial improvement followed by worsening within 10 days with new fever, worsening headache, and increased facial pain 1
• Unilateral maxillary tenderness on examination, which is highly specific for bacterial infection 1, 2
• Fever developing after initial improvement 1

The American Academy of Otolaryngology–Head and Neck Surgery (2015) and IDSA (2012) guidelines both clearly define ABRS when symptoms worsen within 10 days after an initial improvement, which precisely describes this patient's presentation. 1

Why Not the Other Options?

Intranasal Glucocorticoids (Option B)

• While intranasal corticosteroids can be offered for symptomatic relief, they are adjunctive therapy, not primary treatment for established ABRS 1
• This patient needs definitive antimicrobial therapy given his clear bacterial infection criteria 1

Radiography (Option C) or CT (Option D)

• Imaging is explicitly NOT recommended for patients who meet clinical diagnostic criteria for ABRS unless complications or alternative diagnoses are suspected 1
• The American Academy of Otolaryngology made a strong recommendation against radiographic imaging in uncomplicated ABRS 1
• This patient has no warning signs of complications (no periorbital swelling, no visual changes, no severe neurological symptoms) 1
• Radiographic findings cannot distinguish viral from bacterial causes and would increase costs 4-fold without changing management 1

Recommended Antibiotic Regimen

First-line therapy: Amoxicillin-clavulanate 1

• The 2015 AAO-HNS guideline changed from recommending amoxicillin alone to amoxicillin with or without clavulanate as first-line therapy 1
• The IDSA (2012) specifically recommends amoxicillin-clavulanate as the preferred agent due to increasing resistance patterns, particularly ampicillin-resistant Haemophilus influenzae and Moraxella catarrhalis 1
• Duration: 5-10 days for most adults 1

Alternative agents (for penicillin allergy): Doxycycline or respiratory fluoroquinolone (levofloxacin, moxifloxacin) 1

Key Clinical Pitfall

The critical error would be pursuing imaging studies in this straightforward case of ABRS. The patient's clinical presentation alone is sufficient for diagnosis and treatment initiation. Imaging should be reserved for:

• Suspected complications (orbital cellulitis, meningitis, brain abscess) 1
• Failure to respond to appropriate antibiotic therapy after 7 days 1
• Recurrent episodes requiring evaluation for anatomic abnormalities 1

Follow-Up

Reassess if the patient worsens or fails to improve within 7 days of antibiotic initiation to confirm diagnosis, exclude complications, and consider broadening antimicrobial coverage. 1