RESUMEN
OBJECTIVE: To evaluate the impact of new reimbursement decisions for palivizumab treatment on respiratory syncytial virus (RSV) hospitalisations and the concomitant number of palivizumab prescriptions for infants aged <2 years. DESIGN: We compared the RSV hospitalisation rates in infants before and after implementation of new limitations during three RSV seasons 2014-2017. SETTING: Population aged <2 years at the beginning of each RSV seasons extracted from regional health systems (Lazio region, 2016, 5 898 124 inhabitants and 47 595 births). PATIENTS: Out of 70 323 infants, 5895 (8.4%) premature babies (gestational age (GA) <37 weeks) were followed before-after Italian Medicines Agency (AIFA)-2016 limitations. INTERVENTION: In 2016, AIFA, following the American Academy of Pediatrics guidelines, decided to limit coverage of palivizumab prophylaxis (GA ≤29 weeks). MAIN OUTCOMES MEASURES: Trend of hospitalisations by months and rate of RSV before-after new restrictions were analysed. Palivizumab prescriptions and costs for National Health Service (NHS) were considered. RESULTS: In a population of 284 902 aged <2 years, the number of hospitalisations due to RSV infection was 1729. Following AIFA-2016 limitations, a reduction in the number of RSV infection-based hospitalisations from 6.3/1000 (95% CI 6.0 to 6.7) to 5.5/1000 (95% CI 5.0 to 5.9) was observed. Palivizumab showed a concomitant reduction of 48% in the number of prescriptions (saving 750 000 for the NHS). No differences of GA, age on admission or severity of RSV infection were observed. CONCLUSIONS: Implementation of the new palivizumab reimbursement criteria was not associated with an increase in the RSV hospitalisation rate for children aged <2 years despite a significant reduction in the number of palivizumab prescriptions.