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We assessed the effectiveness of CDS in controlling inappropriate red blood cell (RBC) and platelet transfusion in a large acute hospital and how speciality specific behaviours changed in response.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We used segmented linear regression of interrupted time series models to analyse the instantaneous and long term effect of introducing blood product electronic warnings to prescribers. We studied the impact on transfusions for patients in critical care (CC), haematology\/oncology (HO) and elsewhere.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In non-CC or HO, there was significant and sustained decrease in the numbers of RBC transfusions after introduction of alerts. In CC the alerts reduced transfusions but this was not sustained, and in HO there was no impact on RBC transfusion. For platelet transfusions outside of CC and HO, the introduction of alerts stopped a rising trend of administration of platelets above recommended targets. In CC, alerts reduced platelet transfusions, but in HO alerts had little impact on clinician prescribing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The findings suggest that CDS can result in immediate change in user behaviour which is more obvious outside specialist settings of CC and HO. It is important that this is then sustained. In CC and HO, blood transfusion practices differ. CDS thus needs to take specific circumstances into account. In this case there are acceptable reasons to transfuse outside of these crude targets and CDS should take these into account.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12911-022-02045-8","type":"journal-article","created":{"date-parts":[[2022,12,29]],"date-time":"2022-12-29T11:02:43Z","timestamp":1672311763000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Effectiveness of clinical decision support in controlling inappropriate red blood cell and platelet transfusions, speciality specific responses and behavioural change"],"prefix":"10.1186","volume":"22","author":[{"given":"Jolene","family":"Atia","sequence":"first","affiliation":[]},{"given":"Felicity","family":"Evison","sequence":"additional","affiliation":[]},{"given":"Suzy","family":"Gallier","sequence":"additional","affiliation":[]},{"given":"Sophie","family":"Pettler","sequence":"additional","affiliation":[]},{"given":"Mark","family":"Garrick","sequence":"additional","affiliation":[]},{"given":"Simon","family":"Ball","sequence":"additional","affiliation":[]},{"given":"Will","family":"Lester","sequence":"additional","affiliation":[]},{"given":"Suzanne","family":"Morton","sequence":"additional","affiliation":[]},{"given":"Jamie","family":"Coleman","sequence":"additional","affiliation":[]},{"given":"Tanya","family":"Pankhurst","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,12,29]]},"reference":[{"key":"2045_CR1","unstructured":"Allard, S., et al., Handbook of transfusion medicine 5ed. 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