Prediction of postoperative delirium occuring in patients with femoral neck fractures *
We statistically investigated 71 patients that received an operation for femoral ncck fractures concerning postoperative delirium in association with preoperative clinical evaluation. The male/ female ratio was 11/60, and the average age was 80.7 years old. 19 cases (26.8%) exhibited postoperative delirium. The occurrence of delirium and the DRS score were related to preoperative disturbance of consciousness, insomnia, cerebral infarction, past history of delirium, and the use of any of the following 3 drugs : antiparkinsonian agents, H2 blockers, antidepressants. Moderate or severe liver dysfunction was related to the occurrence of delirium. The period between the injury and the operation, dementia, respiratory failure, and anxiety states were related to the DRS score. As a result of multivariate analysis, category weight ranges were provided in the following order : preoperative disturbance of consciousncss, the use of any drug among the 3, cerebral infarction, past history of delirium, dementia, length of a preoperative period, respiratory failure, insomnia. And a predictive formula of DRS was contrived as follows. Y = 9.530 + sum of each category weight (Y = estimate value of DRS). It was found that preoperative disturbance of consciousness and the use of any of the 3 drugs, mosl Strongly influence postoperative delirium. (Accepted on June 16, 1999) Kawasaki Igakkaishi 25(2) : 97-104, 1999
