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BACKGROUND: There is not enough evidence regarding the need for perioperative prophylactic steroid at the time of transsphenoidal pituitary surgery [1], and it is currently administered empirically. In patients with normal preoperative adrenal function, the meta-analysis of nonrandomized studies [2] and only two randomized controlled studies [3,4] suggested no necessity to routine steroid administration, but the number of the studies subjects was small. Analysis using big data has not been performed. Therefore, this study examined the relationship between perioperative steroid administration and complications using a nationwide Diagnosis Procedure Combination database in Japan. Method: We performed a retrospective study on patients who had undergone pituitary surgery (excluding meningiomas, Cushing’s disease, and preoperative steroid administration) between July 2010 and March 2016. To this end, a nationwide inpatient database in Japan was used, and the patients were divided into a prophylactic steroid-administered group and a nonadministered group. Patients’ complications, including hypopituitarism, diabetes insipidus, meningitis, hyponatremia, and hypokalemia, and discharge status were examined by inverse probability of treatment weighting using propensity score. Result: A total of 7,725 inpatients received prophylactic steroids, whereas 864 did not. The inverse probability of treatment weighting using propensity score revealed that the incidence of hypopituitarism and diabetes insipidus was significantly higher in the prophylactic steroid group than in the nonsteroid group (3.5% vs. 0.5%, P 0.001 and 9.6% vs. 6.0%, P = 0.001, respectively). There were no significant differences in the incidences of meningitis, electrolyte abnormalities, and length of hospital stay. This study using big data suggests that prophylactic steroid administration may not be necessary in patients with an intact adrenocortical function undergoing transsphenoidal pituitary surgery. 1. Fleseriu M, et al. J Clin Endocrinol Metab. 101:3888–3921 (2016) 2. Tohti M, et al. PLoS One 10: e0119621 (2015) 3. Sterl K, et al. Neurosurgery 85: E226-e232 (2019)4. Lee HC, et al. Neurosurg (2020, in press)

MON-274 Analysis of Perioperative Prophylactic Steroid for Pituitary Surgery Using a National Inpatient Database in Japan