ORA 316-Dr. Pragya Shrestha.cdr

Shrestha P et al 2 3 4 5, 6 Pragya Shrestha1*, Dil Islam Mansur , Subindra Karki , Sunima Maskey , Bishal Sah Roshan Chaudhary 1816 ISSN: 2542-2758 (Print) 2542-2804 (Online) Birat Journal of Health Sciences Vol.7/No.2/Issue 18/May-August, 2022 Received : 27 May, 2022 Accepted : 26 August, 2022 Published : 15 November, 2022 Original Research Ar cle ISSN: 2542-2758 (Print) 2542-2804 (Online) 1817 Birat Journal of Health Sciences Vol.7/No.2/Issue 18/May-August, 2022 INTRODUCTION The Evan's Index (EI) was given by Willams Evan in 1942 that is used as a method to measure ventricles of the human brain. EI is calculated as the ra o of inter anterior horns distance of the lateral ventricles (IAHDLV) to the maximal 1 internal diameter of the skull (MIDS) at the same level. The ventricles are the series of intercommunica ng cavi es within the brain filled with cerebrospinal fluid (CSF) namely; 2 two laterals, third and fourth ventricle. The symptoma c accumula on of CSF is called hydrocephalus which may be due to obstruc on, hypersecre on, or disturbed absorp on of CSF. It is also seen in old age which has the idiopathic 3 cause known as Normal-pressure hydrocephalus. Ventricular enlargement warns about the neurological changes of the brain. Quick and reliable assessment of ventricular size in rou ne radiological evalua on is 4 inevitable. Studies have shown a strong correla on between 5,6 the linear indices and volume of the brain. As the volumetric analysis of the ventricle is technique sensi ve and laborious the linear evalua on of ventricle size by the EI 5 is used as a surrogate marker of ventricular volume. The study claimed the EI value 0.30 to represent the cut-off 1 value, above which indicates ventricular enlargement. Although many authors raise the ques on about the reliability of EI in the assessment of ventricular size, it is s ll used in clinical rou ne as it is feasible. Furthermore, it precludes the need for special so ware that may be 7 inaccessible especially in developing countries. Research in different parts of the world has shown varia ons 5,7 in the reference value of EI. The ventricular volume is 8 influenced by age, sex and ethnicity. There are only a few studies to generate mean EI value among the Nepalese popula on. So, this study aims to provide the baseline value of EI in the adult Nepalese popula on and also probes into the effect of age and gender on EI.