Treatment of Sinusitis After Augmentin Failure

Assessment of Treatment Failure

• The American Academy of Otolaryngology-Head and Neck Surgery defines treatment failure as worsening of symptoms or lack of improvement within 7 days after diagnosis of acute bacterial rhinosinusitis (ABRS) 2
• Failure to improve is characterized by persistent presenting signs or symptoms without reduction by 7 days after diagnosis, according to the American Academy of Otolaryngology-Head and Neck Surgery 2

Next-Line Antibiotic Options

• The American College of Physicians recommends respiratory fluoroquinolones (levofloxacin or moxifloxacin) as the first choice for 5-7 days, with excellent coverage for both S. pneumoniae and H. influenzae, including resistant strains 1
• High-dose amoxicillin-clavulanate (2g every 12 hours) is an alternative option, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery and the Journal of Allergy and Clinical Immunology 2, 4

Adjunctive Therapies

• The Journal of Allergy and Clinical Immunology recommends intranasal corticosteroids as an adjunct to antibiotic therapy, to reduce mucosal inflammation 4, 1
• Saline irrigation improves sinus drainage and mucociliary clearance, as recommended by Praxis Medical Insights 1

Monitoring Response to New Treatment

• Clinical improvement should be expected within 3-5 days of starting appropriate therapy, according to Praxis Medical Insights 1
• If symptoms worsen after 48-72 hours or fail to improve after 3-5 days on the new antibiotic, further evaluation is needed, as recommended by the Journal of Allergy and Clinical Immunology and Praxis Medical Insights 4, 1

When to Consider Specialist Referral

• If the patient fails to respond to the respiratory fluoroquinolone, specialist referral should be considered, as recommended by Praxis Medical Insights 1
• Recurrent sinusitis (typically 3 or more episodes per year) is another indication for specialist referral, according to Praxis Medical Insights 1

Potential Causes of Treatment Failure

• Resistant bacterial pathogens not adequately covered by prior antibiotics are a potential cause of treatment failure, as noted by Praxis Medical Insights 1
• Presence of nasal polyps impeding drainage is another potential cause of treatment failure, according to the Journal of Allergy and Clinical Immunology and Praxis Medical Insights 4, 1

Important Caveats and Pitfalls

• Macrolides (azithromycin, clarithromycin) should be avoided as second-line agents due to their relatively weak activity against penicillin-resistant H. influenzae and S. pneumoniae, as recommended by Praxis Medical Insights 1
• Cefixime and ceftibuten have poor activity against S. pneumoniae and should not be used as monotherapy, according to Praxis Medical Insights 1

Imaging Considerations

• Imaging studies are not indicated for uncomplicated ABRS but may be appropriate to "rule out" ABRS if the patient does not respond to therapy, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 2
• A sinus CT scan may be considered if symptoms fail to improve after appropriate antibiotic therapy, according to Praxis Medical Insights 5