Management of Refractory Sinusitis

Indications for Nasal Endoscopy

The IDSA guidelines recommend that patients who continue to deteriorate clinically despite extended courses of antimicrobial therapy should be referred to a specialist for consultation, and nasal endoscopy is the most appropriate next step in management 1.
Nasal endoscopy allows direct visualization of the middle meatus to identify purulent drainage, anatomic obstruction, nasal polyps, or fungal debris that may explain antibiotic failure 2.
The American Academy of Otolaryngology-Head and Neck Surgery guidelines state that nasal endoscopy is a crucial diagnostic tool in the management of refractory sinusitis 4.

Purulent drainage from the middle meatus confirms bacterial sinusitis and allows culture, guiding antibiotic selection for resistant organisms (Pseudomonas, MRSA, anaerobes) 1.
Nasal polyps suggest chronic rhinosinusitis with nasal polyps (CRSwNP) requiring corticosteroid therapy, and identification of chronic rhinosinusitis shifts management to intranasal corticosteroids and saline irrigation rather than prolonged antibiotics 2.
Fungal debris or allergic mucin indicates fungal sinusitis requiring antifungal therapy or surgical debridement, and detection of complications (orbital cellulitis, intracranial extension) prompts urgent CT imaging and possible surgical intervention 4.

Endoscopically-guided cultures of the middle meatus can identify resistant organisms or unusual pathogens (anaerobes, fungi, Pseudomonas) that are causing treatment failure, and the IDSA recommends that cultures be obtained by direct sinus aspiration rather than by nasopharyngeal swab in patients with suspected sinus infection who have failed to respond to empiric antimicrobial therapy 1.
Culture results guide antibiotic selection for resistant organisms, and nasopharyngeal cultures are unreliable and do not correlate with actual sinus pathogens 1, 3.

The IDSA guidelines explicitly state that patients who continue to deteriorate clinically despite extended courses of antimicrobial therapy should be referred to a specialist for consultation, and do not continue empiric antibiotics in patients who have failed multiple courses without investigating the underlying cause 1.
The American Academy of Otolaryngology-Head and Neck Surgery guidelines state that plain sinus radiographs are unnecessary for patients with a clinical diagnosis of ABRS, and do not order plain sinus radiographs as they provide inadequate diagnostic information and have been supplanted by CT and endoscopy 4.

If purulent drainage is visualized, obtain endoscopically-guided culture and adjust antibiotics based on sensitivities, and if anatomic obstruction is identified, refer for functional endoscopic sinus surgery (FESS) 1.
If fungal infection is suspected, obtain CT imaging and consider antifungal therapy or surgical debridement, and if chronic rhinosinusitis is confirmed, initiate high-dose intranasal corticosteroids and daily saline irrigation 2, 4.