Abstract WP268: Associations Between Case Volume and Outcomes in the Subarachnoid Hemorrhage Patients With Clipping or Coiling: J-ASPECT Study

Background: Many studies have reported that high-volume center was associated with the favorable outcomes in subarachnoid hemorrhage (SAH) patients with treatment. However, in Japan, the effect of the case volume of the hospital in SAH patients remains elusive. The aim of this study is to investigate the associations between case volume and outcomes of clipping or coiling using data obtained from the Japanese Diagnosis Procedure Combination [DPC]-based Payment System. Methods: Of the 847 certified training institutions of the Japan Neurosurgical Society, 327 institutions agreed to participate in this DPC discharge database study. Data on patients hospitalized for SAH between April 1, 2012 and March 31, 2013 were obtained from the DPC database. Patients hospitalized because of SAH were identified using International Classification of Diseases-10 diagnosis codes (I60.0-9). The case volumes of clipping and coiling in each hospital were divided into quintiles (Q1-Q4). Odd ratios (ORs) of in-hospital mortality...