Diagnosis and Management of Rhinosinusitis

Diagnostic Criteria for Acute Rhinosinusitis

• The American Academy of Otolaryngology-Head and Neck Surgery recommends that acute rhinosinusitis be diagnosed when at least 2 of 4 cardinal symptoms (facial pain/pressure, nasal obstruction, nasal discharge, and loss of smell) are present for less than 4 weeks, along with objective evidence of sinonasal inflammation 1
• The presence of purulent nasal discharge is a major symptom of acute rhinosinusitis, as stated by the American Academy of Otolaryngology-Head and Neck Surgery and Rhinology 1, 2
• Nasal obstruction is a major symptom of acute rhinosinusitis, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 1
• Facial pain or pressure, particularly unilateral or in the maxillary area, is a major symptom of acute rhinosinusitis, as stated by Rhinology and the Journal of Allergy and Clinical Immunology 2, 3, 1
• Loss of smell or hyposmia is a major symptom of acute rhinosinusitis, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 1

Diagnostic Criteria for Acute Bacterial Rhinosinusitis (ABRS)

• The American Academy of Otolaryngology-Head and Neck Surgery recommends that antibiotics be prescribed only when criteria for ABRS are met, not for viral rhinosinusitis 1, 4, 5
• The presence of persistent symptoms for 7-10 days without improvement is an indication for antibiotic treatment, as stated by the Journal of Allergy and Clinical Immunology and the American Academy of Otolaryngology-Head and Neck Surgery 3, 1, 4
• Severe symptoms, such as fever >39°C, purulent nasal discharge, and facial pain, for at least 3 consecutive days, are an indication for antibiotic treatment, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 1
• The "double sickening" phenomenon, where symptoms worsen after initial improvement within the first 10 days, is an indication for antibiotic treatment, as stated by Rhinology and the American Academy of Otolaryngology-Head and Neck Surgery 2, 1

Diagnostic Criteria for Chronic Rhinosinusitis (CRS)

• The American Academy of Otolaryngology-Head and Neck Surgery recommends that chronic rhinosinusitis be diagnosed when at least 2 of 4 cardinal symptoms (nasal obstruction, nasal discharge, facial pain, and loss of smell) are present for at least 12 weeks, along with objective evidence of sinonasal inflammation 1
• The presence of nasal polyps, mucopurulent discharge, or mucosal edema in the middle meatus on nasal endoscopy is an objective finding for chronic rhinosinusitis, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 1
• The presence of mucosal changes in the ostiomeatal complex or sinuses on CT scan is an objective finding for chronic rhinosinusitis, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 1

Differentiation between Viral and Bacterial Rhinosinusitis

• The American Academy of Otolaryngology-Head and Neck Surgery recommends that viral rhinosinusitis be suspected when symptoms last less than 10 days and improve gradually, with no high fever or purulent nasal discharge 1, 5, 6
• The presence of persistent symptoms for at least 10 days without improvement, or severe symptoms such as fever >39°C, purulent nasal discharge, and facial pain, suggests bacterial rhinosinusitis, as stated by the American Academy of Otolaryngology-Head and Neck Surgery and Rhinology 1, 2, 4

Pitfalls to Avoid

• The American Academy of Otolaryngology-Head and Neck Surgery recommends that bacterial rhinosinusitis not be diagnosed when symptoms last less than 7 days, as it is likely to be viral 1, 5
• Routine imaging for acute rhinosinusitis without complications should be avoided due to high false positive and false negative rates, as stated by the American Academy of Otolaryngology-Head and Neck Surgery and Praxis Medical Insights 1, 5
• Antibiotics should not be prescribed for viral rhinosinusitis, as 40-60% of cases resolve spontaneously, as recommended by Praxis Medical Insights 4, 5
• Warning signs such as periorbital edema, diplopia, or severe headache should not be ignored, as they may indicate complications requiring immediate evaluation, as stated by the Journal of Allergy and Clinical Immunology and the American Academy of Otolaryngology-Head and Neck Surgery 3, 1

Diagnosis and Management of Rhinosinusitis

Introduction to Rhinosinusitis

• The American Academy of Pediatrics recommends that colored or purulent nasal discharge alone does not distinguish between viral and bacterial rhinosinusitis and should not be used as the sole criterion for prescribing antibiotics 7, 8, 9
• Nasal discharge coloration reflects neutrophil presence, not bacterial infection, with the yellow-green color coming from inflammatory cells and their enzymes that accumulate during both viral and bacterial infections 9

Distinguishing Viral from Bacterial Infection

• The diagnosis of acute bacterial rhinosinusitis requires specific temporal and severity patterns, including persistent symptoms, severe symptoms, or worsening/"double-sickening" patterns, not just purulent discharge 7, 8
• The American Academy of Pediatrics recommends that persistent symptoms, such as nasal discharge or daytime cough lasting ≥10 days without improvement, are indicative of bacterial sinusitis 7
• Severe symptoms, including high fever (≥39°C/102.2°F) for ≥3 consecutive days, thick, colored nasal discharge, and facial pain/pressure, are also indicative of bacterial sinusitis 7
• Worsening/"double-sickening" symptoms, including initial improvement from a viral cold followed by new fever (≥38°C/100.4°F) or substantial worsening of nasal discharge or cough, are also indicative of bacterial sinusitis 7

Critical Clinical Pitfall

• Fewer than 1 in 15 children (and a similar proportion of adults) develop true bacterial sinusitis during or after a common cold 7
• The presence of purulent nasal discharge increases specificity for bacterial infection only when combined with other cardinal symptoms (nasal obstruction or facial pain/pressure) and appropriate timing criteria 8
• Purulent discharge in the middle meatus on examination is more predictive than patient-reported colored mucus, but even this finding requires clinical context 10, 11

Management Implications

• For symptoms lasting <10 days with colored mucus but no severe features, the American Academy of Otolaryngology-Head and Neck Surgery recommends symptomatic treatment, including nasal saline irrigation, analgesics, intranasal corticosteroids, and short-term oral/topical decongestants 9
• Antibiotics are ineffective for viral rhinosinusitis and expose patients to unnecessary adverse effects and contribute to antimicrobial resistance 9
• For persistent symptoms (≥10 days), either initiate antibiotics or observe for an additional 3 days, based on symptom severity and quality of life impact, with the decision involving shared decision-making with the patient 7

Common Misconceptions to Avoid

• Neither nasal mucus color nor fever presence reliably differentiates bacterial from viral disease 8
• Antihistamines should not be used as primary treatment for acute bacterial sinusitis, although they may help concurrent allergic symptoms in atopic patients 7
• The typical viral cold lasts 5-10 days, with symptoms peaking at days 3-5 before gradual improvement 7, 9

Management of Post-Viral Rhinosinusitis

Introduction to Antibiotic Use

• The European Position Paper on Rhinosinusitis (EPOS) 2020 guidelines, based on moderate-quality evidence from multiple randomized controlled trials, demonstrate no benefit of antibiotics for post-viral acute rhinosinusitis in adults 12

Diagnosis and Treatment Criteria

• The American College of Physicians recommends that patients with post-viral rhinosinusitis should not be prescribed antibiotics unless they meet specific diagnostic criteria for Acute Bacterial Rhinosinusitis (ABRS), including persistent symptoms ≥10 days without improvement, severe symptoms, or "double sickening" 13

Evidence Against Antibiotic Use

• The EPOS 2020 guidelines show no difference in cure rates at 10-14 days (RR 1.02, 95% CI 0.96-1.08) with antibiotic use in post-viral acute rhinosinusitis in adults 12
• Antibiotics cause significantly more adverse events compared to placebo (RR 1.28, 95% CI 1.06-1.54) in patients with post-viral rhinosinusitis 12
• Inappropriate antibiotic prescribing for respiratory infections is a major driver of antibiotic resistance, with individuals prescribed antibiotics for respiratory infections developing bacterial resistance that persists for up to 12 months 14

Appropriate Management

• The patient should continue symptomatic therapy, including intranasal corticosteroids (fluticasone), intranasal antihistamine (azelastine), and mucolytics and antihistamines as needed for symptom control 12, 14
• Reassess the patient if they develop worsening symptoms after initial improvement, new fever ≥39°C with purulent discharge and facial pain for ≥3 consecutive days, or symptoms that persist beyond 28 days without improvement 13