Low social support is associated with an increased risk of postoperative delirium

Study ObjectiveTo examine the predictive value of social support in postoperative delirium.DesignProspective observational study.SettingPostoperative recovery room and orthopedic surgery department.Patients106 consecutive patients undergoing a planned orthopedic surgery with general anesthesia.MeasurementsAll patients completed questionnaires to assess depressive mood (the Beck Depression Inventory) and social support (Sarason's Social Support Questionnaire) during the preanesthesia visit. Postoperative delirium symptoms were assessed daily using the Memorial Delirium Assessment Scale. Demographic, clinical, and biological data, including anesthesia procedure, were recorded.Main ResultsControlling for various potential confounders through multivariate binary logistic regression, postoperative delirium was independently predicted by satisfaction with social support, but neither by depressive mood nor the number of supportive persons. Other significant predictors were the preoperative use of benzodiazepines, age, and type of surgery.ConclusionPatients who report low satisfaction with social support may present with a particular vulnerability to postoperative delirium, even after controlling for physical confounding variables and depressive mood.