• Jakub Kazmierski, Maciej Kowman, Maciej Banach, Wojciech Fendler, Piotr Okonski, Andrzej Banys, Ryszard Jaszewski, Jacek Rysz, Dimitri P Mikhailidis, Tomasz Sobow, Iwona Kloszewska, and IPDACS Study.
• Department of Old Age Psychiatry and Psychotic Disorders, Medical University of Lodz, Poland. jakub.kazmierski@umed.lodz.pl
• J Psychosom Res. 2010 Aug 1;69(2):179-85.

ObjectiveDelirium after cardiac surgery is a serious complication that results in higher morbidity and mortality rates, and prolongs hospitalisation. However, the knowledge base regarding the issue of postoperative delirium is still limited. Therefore, in the current study, we evaluated the incidence and independent perioperative risk factors of delirium after cardiac surgery.MethodsThe IPDACS Study recruited 563 consecutive patients undergoing cardiac surgery with cardiopulmonary bypass. The subjects were preoperatively examined by psychiatrists using the Mini-Mental State Examination and the Mini International Neuropsychiatric Interview to assess psychiatric comorbidity. Additionally, other variables connected to the patients' medical condition and surgical and anaesthetic procedures were evaluated. A diagnosis of delirium following surgical intervention was based on Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) criteria.ResultsThe incidence of postoperative delirium according to DSM-IV criteria was 16.3% (95% confidence interval: 13.5-19.6). Multivariate stepwise logistic regression analysis revealed that advanced age, preoperative cognitive impairment, an ongoing episode of major depression, anaemia, atrial fibrillation, prolonged intubation and postoperative hypoxia were independently associated with delirium after cardiac surgery.ConclusionAccording to the current analysis, the aforementioned conditions independently predispose to delirium following cardiac surgery. Since some of these factors can be successfully treated and eliminated preoperatively and postoperatively, this study should be helpful in reducing the risk of delirium and in improving the medical care of patients undergoing cardiac surgery (Clinical Trials Identifier: NCT00784576).Copyright 2010 Elsevier Inc. All rights reserved.

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