STUDY DESIGN: A retrospective cohort study. PURPOSE: To investigate the risk factors for postoperative delirium after spine surgery, excluding older age, which has already been established as a strong risk factor. OVERVIEW OF LITERATURE: More than 30 risk factors have been reported for delirium after spine surgery, making it challenging to identify which factors should be prioritized. We hypothesized that risk factors could not be prioritized to date because the factor of older age is very strong and influenced other factors. To eliminate the influence of older age, we performed an age-matched group comparison analysis for the investigation of other risk factors. METHODS: This study involved 532 patients who underwent spine surgery. Two patients of the same age without delirium (delirium negative group) were matched to each patient with delirium (delirium positive group). Differences in suspected risk factors for post-operative delirium between the two groups identified from previous reports were analyzed using univariate analysis. Multivariate analysis was performed for factors that showed a significant difference between the two groups in the univariate analysis. RESULTS: Fifty-nine (11.1%) of 532 patients developed postoperative delirium after spine surgery. Large amounts of intraoperative bleeding, low preoperative concentration of serum Na, high postoperative (day after surgery) serum level of C-reactive protein, low hematocrit level, low concentration of albumin, and high body temperature were detected as significant risk factors in the univariate analysis. Large amounts of intraoperative bleeding remained a risk factor for postoperative delirium in the multivariate analysis. CONCLUSIONS: We should pay attention to and take precautions against the occurrence of postoperative delirium after spine surgery in patients of older age or those who experience severe intraoperative bleeding.
Body Temperature ; C-Reactive Protein ; Cohort Studies ; Delirium ; Hematocrit ; Hemorrhage ; Humans ; Multivariate Analysis ; Retrospective Studies ; Risk Factors ; Spine

Owing to the fear of worsening their relationship with physicians, several pharmacists hesitate to contact physicians regarding prescription-related questions. We investigated the personal factors of pharmacists contributing to their hesitation to contact physicians regarding prescription-related questions. We analyzed the responses of 213 pharmacy pharmacists. A comparison of the degree of hesitation to contact physicians regarding prescription-related questions revealed that the most hesitant questions were pertaining to “the same prescription content from before”; insurance questions (3.37) were higher than medical questions (3.20) (P＝0.006). The multiple regression analysis results revealed that “pharmacy work is busy and there is no time” was influenced by regular employees (medical (β＝−0.181, P＝0.030) and insurance (β＝−0.257, P＝0.002)). “A co-pharmacist said no questions needed” was influenced by the sex of pharmacists (medical (β＝0.194, P＝0.011) and insurance (β＝0.177, P＝0.020)). Overall, type of questions (medical or insurance) and individual backgrounds (prescription issuing medical institution, pharmacy scale, location, age, sex, employment type, years of service, current management pharmacist, and hospital work experience) have a complex effect on the pharmacists’ psychology. To facilitate pharmacists to contact physicians regarding prescription-related questions, physicians and pharmacists should share information and communicate on a daily basis, such as actively participate in joint training programs. It is also important to create an environment where regular employees and female pharmacists can work comfortably. The smooth resolution of prescription-related questions by relieving the psychological pressure of pharmacists will improve patient safety.