Factors associated with salbutamol overuse in bronchiolitis.

Numerous studies have shown that quality improvement methods can reduce the use of medications in the management of bronchiolitis. Our objective is to identify factors related to the overuse of salbutamol in the treatment of bronchiolitis before and after an improvement initiative. Observational study of sociodemographic and clinical factors associated with the use of salbutamol in children diagnosed with bronchiolitis. This was a secondary analysis of a prospective cohort study conducted at 135 primary care (PC) centers and eight pediatric emergency departments (ED) in the Osakidetza/Basque Health Service (Spain) in two epidemic seasons between which a bronchiolitis integrated care pathway (BICP) had been implemented: pre-intervention season from October 2018 to March 2019 and post-intervention season from October 2019 to March 2020. Generalized linear mixed models were used to estimate association of studied variables on use of salbutamol over the two seasons. Four thousand one hundred thirty-four ED attendances and 8573 PC visits were included, of which 1936 (46.8%). And 4067 (47.4%) occurred in the post-intervention period respectively. Six independent risk factors were associated with overuse of salbutamol in both seasons: age ≥ 1 year, aOR 2.32 (2.01 to 2.68) in PC centers, and aOR 6.84 (4.98 to 9.39) in EDs; being seen in the last third of the bronchiolitis season, aOR 1.82 (1.51 to 2.18) in PC centers and aOR 1.78 (1.19 to 2.64) in EDs; making more than one visit to the PC center, aOR 4.18 (3.32 to 5.27) or the ED, aOR 2.06 (1.59 to 2.66); being seen by a general practitioner, aOR 1.97 (1.58 to 2.46) in PC centers; and having a more severe episode, aOR 3.01 (1.89 to 4.79) in EDs.     Conclusion:There are factors associated with salbutamol overuse in children diagnosed with bronchiolitis in PC and emergency settings that persist after the deployment of quality improvement initiatives. What is Known: • Quality improvement initiatives have been shown to decrease the use of non-evidence-based treatments and testing in bronchiolitis. • The magnitude and pattern of change in the use of medications linked to the quality improvement initiatives are not uniform across the same health service. What is New: • Children diagnosed with bronchiolitis ≥ 1 year of age, seen in the last third of the bronchiolitis season, attending more than once, treated by a general practitioner, and/or with more severe episodes are more likely to be treated with salbutamol. • These factors may remain present despite the implementation of improvement initiatives focused on reducing the use of medications in the management of bronchiolitis.