Chronic Rhinosinusitis with Bacterial Superinfection

Diagnosis

The American Academy of Allergy, Asthma, and Immunology recommends that symptoms persisting for 3 months (≥12 weeks) definitively establish chronic rhinosinusitis, with cardinal symptoms including loss of smell, nasal swelling/obstruction, and purulent nasal discharge 1, 2
Chronic rhinosinusitis requires at least 2 of 4 cardinal symptoms for ≥12 weeks, including nasal blockage/obstruction, nasal discharge, facial pain/pressure, or reduction/loss of smell, with this patient having three of these symptoms 2, 3
The presence of green thick discharge indicates mucopurulent inflammation, suggesting either active bacterial superinfection or chronic infectious sinusitis, with chronic infectious sinusitis typically associated with neutrophil influx and may involve anaerobic bacteria, gram-positive streptococcus, bacteroides, Fusobacterium species, or S. aureus 1, 4

Definitive diagnosis requires objective evidence through either nasal endoscopy showing mucopurulent discharge, edema, or mucosal obstruction in the middle meatus, or CT imaging demonstrating mucosal changes, though not required for initial management 1, 2, 3
Imaging is not recommended initially unless complications are suspected, medical therapy fails, or surgery is being considered 4, 5

The American Academy of Otolaryngology recommends high-volume nasal saline irrigation for mucociliary clearance, with amoxicillin or penicillin (beta-lactams) being most effective for acute bacterial rhinosinusitis, and a short-term course of 10-14 days for the acute bacterial component 1, 4, 6
Consider a longer duration of antibiotics (up to 4 weeks) given the chronic nature, as chronic infectious sinusitis may require extended therapy targeting anaerobic pathogens 1, 6
Purulent discharge alone does not distinguish bacterial from viral infection in acute settings, but in the context of 3-month duration with loss of smell, bacterial involvement is likely, and antibiotics are not effective for viral or post-viral rhinosinusitis 4, 7

Refer to an otolaryngologist if symptoms persist despite appropriate medical therapy, or if there are recurrent acute bacterial sinusitis (≥3-4 episodes per year), suspected complications, or consideration for functional endoscopic sinus surgery 1, 3, 6, 8, 9