Mean Evan's Index among Patients with Normal Computed Tomography Scan visiting Radiology Department in a Tertiary Care Centre of Nepal: A Descriptive Cross-sectional Study

INTRODUCTION: Evan's index is useful to objectively see if ventricles size is abnormal especially in borderline cases of hydrocephalus. Studying ventricular size in CT scan is essential in every pathology of the brain. Use of objective parameters to define hydrocephalus helps us not only to diagnose a case but also follow up the case following treatment. The aim of this study was to find out the mean evan index among patients visiting the department of radiology of a tertiary care hospital. METHODS: A descriptive cross-sectional study was conducted at a tertiary care hospital from 1st january 2020 to 31st December 2020. Ethical clearance was obtained from the Institutional Review Committee of Upendra Devkota Memorial Neurological and Allied Sciences (reference number: 116/2021). Computed tomography scans were done for various reasons in the hospital over a one year period and reported normal by the radiologists were included in the study. Convenient sampling was done. Statistical analysis was done using Statistical Package for the Social Sciences. Point estimate at 95% Confidence Interval was calculated along with mean and standard deviation for continuous data. RESULTS: In this study, among the 216 cases, the mean Evan's index was found to be 0.20±0.04. CONCLUSIONS: The mean evan's index in our study population was lower than the normal cut-off value.