摘要：The purpose of the study is to examine whether, among patients who visited hospitals and underwent brain MRI or MRA scan tests, there was a relationship between the existence of clinically significant abnormal findings and the relevance of primary care physicians’ referrals. A case-control study was carried out at six teaching hospitals in Japan. We identified cases with significant abnormal MRI/MRA findings from radiologists’ reports based on certain explicit criteria and controls with outpatients who underwent MRI/MRA scans but did not have stroke. We also collected clinical data independently from medical records. The findings of 156 cases and 721 controls were collected for the analysis. A multivariate analysis adjusted by age group, sex, and the number of comorbidity factors showed that those who had visited the hospitals after referral were more likely to have significant abnormal findings in their MRI/MRA scan results (odds ratio [OR] = 1.6, 95% CI: 1.1 to 2.4). The present study suggests that referral from gatekeepers such as primary care physicians is effective in determining the appropriate use of brain MRI/MRA tests for hospital outpatients.
