Abstract
Delirium is an acute confusional state characterized by fluctuating symptoms including inattention, disorganized thinking and an altered level of consciousness.1 Delirium occurs quite commonly as a complication of surgery in elderly patients2 and is associated with an increased risk of morbidity and mortality as well as the loss of independence.3,4 Because preexisting cognitive impairment is the strongest risk factor for delirium,5 it is recommended that elderly patients undergo brief cognitive testing at the time of admission.4 However, routine preoperative evaluation does not include the assessment of baseline cognitive function such as the Mini-Mental State Examination (MMSE)6 due to limited time and clinical resources.7 The informant-based questionnaire is a good complement to direct cognitive testing8 and is easy to administer.9 Therefore, we performed a pilot study to investigate whether the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE),10 the most widely used informant-based questionnaire, could be useful for predicting postoperative delirium in elderly patients.
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