Diagnosis and Management of Acute Sinusitis

Clinical Features and Diagnosis

The American Academy of Allergy, Asthma, and Immunology recommends that the diagnosis of acute sinusitis fundamentally requires persistent upper respiratory symptoms lasting 10-14 days without improvement 1
The presence of at least three cardinal features, including purulent nasal discharge, nasal obstruction/congestion, and facial pain, pressure, or fullness, is necessary for the diagnosis of acute bacterial sinusitis 1
Additional supportive symptoms include postnasal drainage with purulent quality, dental pain or headache, cough, and fever, malaise, or fatigue 1, 2
Positive findings that support the diagnosis include tenderness overlying the sinuses on palpation, purulent secretions visible on nasal examination or endoscopy, mucosal erythema and edema, and dark circles beneath eyes or periorbital edema 2, 3

If purulent discharge is absent, consider allergic evaluation and trial of intranasal corticosteroids for presumed rhinitis 1, 6
If facial pain/pressure is absent, evaluate for nasal polyps, nasopharyngeal tumor or granulomatous disease, and enlarged or infected adenoids in children 2, 3
If duration is less than 10 days, provide symptomatic treatment only and avoid antibiotics, as this is likely viral rhinosinusitis 4, 7

The American College of Radiology recommends that radiographs are generally not necessary for diagnosing acute sinusitis and have significant false-positive and false-negative rates 2, 3, 4
CT scanning without contrast is the gold standard when imaging is needed, particularly when symptoms are vague or atypical, disease persists despite optimal medical treatment, complications are suspected, or surgical intervention is being considered 5, 7

The Infectious Diseases Society of America recommends that amoxicillin is first-line therapy for uncomplicated acute bacterial sinusitis, and if no improvement after 3-5 days, switch to high-dose amoxicillin-clavulanate 1, 2, 4, 6, 7
Treatment must continue until the patient is well for 7 days (generally 10-14 days total) to ensure complete bacterial eradication 1, 2, 4, 6