Endoscopic Sinus Surgery in Recurrent Acute Rhinosinusitis

Inclusion Criteria: * At least 3 acute sinusitis episodes during previous 6 months or 4 acute sinusitis episodes during previous 12 months or at least 2 episodes per year for 3 consecutive years * Episodes must last less than 4 weeks and be diagnosed and treated as acute rhinosinusitis by a physician * Episode symptoms include nasal discharge, nasal congestion, hyposmia and facial pressure or pain and the episodes have to be severe enough for the patient to seek medical help and for daily life to be significantly disturbed * Patients must have failed a three-month conservative therapy (medication for possible allergies, nasal corticosteroids and douching and courses of antibiotics as necessary) Exclusion Criteria: * Age under 18 years, * Immunodeficiency or immunosuppression * Pregnancy, * Previous illness making same-day surgery unfeasible * Ongoing antibiotic treatment for other reasons, * Primary complaint of nasal septal deviation and * Chronic rhinosinusitis with or without nasal polyposis * Symptoms for over 12 weeks and/or Lund-Mackay score over 8 in paranasal sinus CBCT scanning