Abstract:Background:The evaluation of degree of ventricular enlargement should be based on established indices rather than on personal experience as this is highly subjective. Our aim was to establish normal values for Evans index in a Nigerian adult population as none has been found in the Nigerian medical literature.Materials and Methods:Axial computerized tomographic brain scans of 488 normal subjects were reviewed retrospectively. Of them, 319 (65.36%) of the patients were males and 169 (34.63%) were females; their… Show more
“…Evan's Index Present study 0.264 ± 0.03 Hamidu A U et al, 13 0.252 ± 0.04 Patnaik P et al, 14 0.27 ± 0.035 Kosourov AK et al, 15 0.22 to 0.28 Wilk R et al, 16 (Pediatric sample) 0.218 to 0.312 Sari E et al, 17…”
Section: Studymentioning
confidence: 88%
“…It is the ratio which compares the maximum width of the frontal horns of lateral ventricles to the maximum transverse diameter of inner table of the skull at the same level. 3 For the diagnosis of Normal Pressure Hydrocephalus (NPH), follow-up cases of ventriculoperitoneal shunt 4 , alcoholism, dementia, this index is an important parameter. Thus developing a baseline reference data of Evan's index will be useful in a wide range of clinical conditions for this population where such data is unavailable.…”
Introduction: Knowledge of the ventricular size is important for the initial and precise diagnosis of hydrocephalus. Evans index is a valuable parameter in diagnosis of the NPH, follow up cases of VP shunt, dementia and many other pathologies. Therefore, having a baseline reference data of the Evan's index will be helpful in a wide range of clinical pathologies. Our aim was to establish normal values for Evans index in a Kashmiri indian population as none has been found in the Kashmiri medical literature. Material and Methods: Axial computerized tomographic brain scans of 300 normal subjects were reviewed. 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. Results: Of them, 185(61.66%) of the patients were males and 115 (38.33%) were females; their ages ranged from 6 to 96 years with a mean age of 47 years. The images were acquired using a 16 slice CT machine. The mean value for Evans index for the studied population was 0.264 ± 0.03. The EI increased with age and it was slightly higher among males. The difference in Evans value in males and females was not statistically significant. Individuals above 60 years old had the highest Evans values in both sexes. Conclusion: This study established the ranges of normal value for Evans index in a kashmiri population. It agrees with the diagnostic cutoff value of > 0.3 for hydrocephalus and it compares well with that of the Caucasians.
“…Evan's Index Present study 0.264 ± 0.03 Hamidu A U et al, 13 0.252 ± 0.04 Patnaik P et al, 14 0.27 ± 0.035 Kosourov AK et al, 15 0.22 to 0.28 Wilk R et al, 16 (Pediatric sample) 0.218 to 0.312 Sari E et al, 17…”
Section: Studymentioning
confidence: 88%
“…It is the ratio which compares the maximum width of the frontal horns of lateral ventricles to the maximum transverse diameter of inner table of the skull at the same level. 3 For the diagnosis of Normal Pressure Hydrocephalus (NPH), follow-up cases of ventriculoperitoneal shunt 4 , alcoholism, dementia, this index is an important parameter. Thus developing a baseline reference data of Evan's index will be useful in a wide range of clinical conditions for this population where such data is unavailable.…”
Introduction: Knowledge of the ventricular size is important for the initial and precise diagnosis of hydrocephalus. Evans index is a valuable parameter in diagnosis of the NPH, follow up cases of VP shunt, dementia and many other pathologies. Therefore, having a baseline reference data of the Evan's index will be helpful in a wide range of clinical pathologies. Our aim was to establish normal values for Evans index in a Kashmiri indian population as none has been found in the Kashmiri medical literature. Material and Methods: Axial computerized tomographic brain scans of 300 normal subjects were reviewed. 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. Results: Of them, 185(61.66%) of the patients were males and 115 (38.33%) were females; their ages ranged from 6 to 96 years with a mean age of 47 years. The images were acquired using a 16 slice CT machine. The mean value for Evans index for the studied population was 0.264 ± 0.03. The EI increased with age and it was slightly higher among males. The difference in Evans value in males and females was not statistically significant. Individuals above 60 years old had the highest Evans values in both sexes. Conclusion: This study established the ranges of normal value for Evans index in a kashmiri population. It agrees with the diagnostic cutoff value of > 0.3 for hydrocephalus and it compares well with that of the Caucasians.
“…Being a record-base study, patient consent was not required however; this research was approved by the ethics committee Nepal medical college and Teaching Hospital and permission was obtained from the hospital authorities. Based on the study of Hamidu et al 14 Evan's Index at 95% confidential level taking standard deviation of 3 mm and margin of error of 0.27mm, the sample size was calculated as 500 using the formula n=Z 2 σ 2 /d 2 Being a retrospective study, patient consent was not required however; this research was approved by the ethics committee Nepal medical college and Teaching Hospital. Scan reports of 500 individuals that were reported excluding abnormality in CT brain were reviewed independently by investigators alongside their images with taking help when needed by radiology expert.…”
Ventriculographic indices are obtained by using Evan’s Index. Evan’s Index is a ratio which compares the maximum width of the frontal horns of the lateral ventricle to the maximum transverse diameter of the inner table of the skull and serves as an indirect marker of ventricular volume. Evan’s Index has been extensively used in the diagnosis of idiopathic normal pressure hydrocephalus, in the assessment of outcome of patients having shunt placement which is the primary mode of treatment. This study was aimed to find out the normal values of Evan’s Index on brain CT scan in individuals attending Nepal medical college teaching hospital, Kathmandu, Nepal. A total of 500 individuals CT (250 males and 250 females) were finally selected. The ages were ranged between 5 to 80 years old. The mean Evan’s Index in the studied population was 0.253 ± 0.037 in males, 0.250 ± 0.034 in the females and an overall mean of 0.251 ± 0.035. There was no significant statistical difference in the Evans ratio between male and females (P = 0.274). This study shows that Evan’s Index was higher in individuals who were 60 years and above in both males and females. The very small standard deviations appreciated in the result suggest that Evan’s index can be calculated fairly accurately.
“…1 ). The brain atrophy was considered when sulcal width(SW)>2.5 mm, lateral ventricular body width(VW)>30 mm [ 5 ] or Evans index(EI) of >0.3 [ 26 ] was demonstrated. Fig.…”
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