Acute otitis media (AOM) and sore throat are common reasons for antibiotic prescription in children. Starting from 2007, evidence-based guidelines and other multifaceted improvement activities (ProBA project) were implemented in Emilia-Romagna, a northern Italian region. Antibiotic prescription rate in the region decreased with time (37% relative reduction from 2005 to 2019). Within the ProBA project, this retrospective observational study, including all hospitals of the region, aims to assess if lower rate of antibiotic prescription was associated with an increased rate of acute mastoiditis and acute rheumatic fever (ARF). Hospital admission rates for acute mastoiditis and ARF from 2005 to 2019 were calculated using ICD-9 codes. Hospital intervention rates for myringotomy, incision of mastoid, and mastoidectomy were also assessed. A comparison with antibiotic prescription rate in the pediatric population was performed. Data were gathered using administrative databases and trends were calculated using Poisson regression. During the study period, rate of mastoiditis and similar diagnosis declined from 54.1 to 33.6 per 100.000 (β coefficient = - 0.047, p value < 0.001) and rate of surgical treatment from 134.6 to 89.6 per 100.000 (β coefficient = - 0.036, p value < 0.001), whereas rate of ARF remained stable at around 4.4-4.8 per 100.000 (β coefficient = - 0.009, p value = 0.472).Conclusion: ProBA project implementation-recommending 5 days of amoxicillin for AOM when needed and 6 days of amoxicillin when streptococcal pharyngitis is detected-was associated with a reduced antibiotic use without an increase of complications. What is Known: • Acute otitis media (AOM) and streptococcal pharyngitis are common pediatric infections and frequent cause of antibiotics prescription. • Fear of rare complications like mastoiditis and acute rheumatic fever can hinder health professionals' compliance with evidence-based guideline. What is New: • Guidelines recommending a short course of antibiotics for AOM and streptococcal pharyngitis are associated with reduced antibiotic prescriptions and no increase of complications. • Analysis based on administrative databases is useful for monitoring projects and supporting health professionals in complying with guidelines.
Keywords: Acute mastoiditis; Acute rheumatic fever; Antibiotic stewardship; Clinical guidelines; Epidemiology; Pediatric upper respiratory infections.