Anaesthesia
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Multicenter Study Observational Study
Prevalence of pre-operative anaemia in surgical patients: a retrospective, observational, multicentre study in Germany.
Anaemia is a risk factor for several adverse postoperative outcomes. Detailed data about the prevalence of anaemia are not available over a long time-period in Germany. In this retrospective, observational, multicentre study, patients undergoing surgery in March in 2007, 2012, 2015, 2017 and 2019 were studied. ⋯ Red blood cell transfusion was associated with an increased risk of mortality (OR 14.98 (95%CI 11.83-19.03); p < 0.001). Using multivariable linear regression analysis with fixed effects, we found that pre-operative anaemia (OR 2.08 (95%CI 1.42-3.05); p < 0.001) and red blood cell transfusion (OR 4.29 (95%CI 3.09-5.94); p < 0.001) were predictors of mortality but not length of stay (0.99 (95%CI 0.98-1.00) days; p = 0.12) and analysed years (2007 vs. 2019: OR 1.49 (95%CI 0.86-2.69); p = 0.07). Pre-operative anaemia affects more than 30% of surgical patients in Germany and multidisciplinary action is urgently required to reduce adverse outcomes.