Evaluation of Evan’s Index in South Indian Population using Computed Tomography
Journal Title: International Journal of Anatomy Radiology and Surgery - Year 2017, Vol 6, Issue 3
Abstract
Introduction: Imbalance in the production and absorption of cerebrospinal fluid results in the enlargement of ventricular system called hydrocephalus. For the early and precise diagnosis of type of hydrocephalus, knowledge of ventricular size is mandatory. Ventricular size can be studied by linear or volumetric measurements, out of which linear ratios of the width of ventricles to the width of skull or brain is the easiest reproducible method. Evan’s Index (EI) is one such ventriculo graphic index. Evan’s index is an important parameter in the diagnosis of normal pressure hydrocephalus, in follow up cases of ventriculoperitoneal shunt, alcoholism, dementia and many more conditions. Therefore, developing a baseline reference data of Evan’s index will be useful in a wide range of clinical conditions. Aim: To establish normal baseline value for Evan’s index in South Indian population with respect to gender and age. Materials and Methods: Total 100 subjects aged between 5 to 90 years, comprising of 54 males and 46 females, with normal CT brain were analyzed retrospectively. Subjects with intracranial and intraventricular pathology were excluded. Axial CT brain was obtained in Siemens Somatom scope multislice CT scanner. EI was measured as the linear ratio of the widest anterior horn width of the cerebral lateral ventricles to the widest inner diameter of the skull. Student’s ‘t’ test and one-way-ANOVA was used to estimate the difference in ventricular size based on sex and across the age groups respectively. Results: The mean EI in our study population was 0.27 ± 0.04 in males, 0.26 ± 0.03 in females and an overall mean is 0.27 ± 0.03. No significant statistical difference was observed in the EI between males and females. With advancing age, mild increase in Evan’s index was noted. Conclusion: Mean EI of 0.27 ± 0.03 in our study supports the adaptation of international guideline cut-off value of EI > 0.30 in the diagnosis of hydrocephalus in our South Indian population as well. EI is less technical, easily reproducible, less time consuming and can be used in routine practice
Authors and Affiliations
Arun Kumar S, S. Meena Kumari, M. Vijai Anand, R. Saraswathy, M. Rajeshwari
Keywords
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- EP ID EP369723
- DOI 10.7860/IJARS/2017/29922:2286
- Views 130
- Downloads 0
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