Mindaugas Urbonas1,2, Nijole Raskauskiene3, Vytenis Deltuva4,3, Adomas Bunevicius3. 1. Department of Neurosurgery, Hospital of Lithuanian University of Health Sciences, Kaunas, Lithuania. mindaugas.urbonas@lsmuni.lt. 2. Neuroscience Institute of the Lithuanian University of Health Sciences, Kaunas, Lithuania. mindaugas.urbonas@lsmuni.lt. 3. Neuroscience Institute of the Lithuanian University of Health Sciences, Kaunas, Lithuania. 4. Department of Neurosurgery, Hospital of Lithuanian University of Health Sciences, Kaunas, Lithuania.
Abstract
OBJECTIVES: We aimed to quantitatively assess Evans index (EI) using ultrasonographic optic nerve sheath diameter (ONSD) measurements in supine and upright position in normal pressure hydrocephalus (NPH) patients. METHODS: Ultrasonographically ONSD was measured in a supine and upright position before and 4-5 days after the ventriculoperitoneal shunt surgery. The changes of the ONSD between supine and upright positions were calculated as ∆ONSD = sONSD-uONSD and as the variation ONSD_V = 100% × [(sONSD - uONSD)/sONSD]. Multiple linear regression analyses were conducted to assess associations between EI and the variation of ONSD. We derived the mathematical function to predict EI. Bland-Altman analysis was applied to evaluate the accuracy and precision of the EI prediction. RESULTS: Thirteen adult patients (mean age 61.8 ± 11.1 (SD) years; 6 (46%) female) undergone VP shunt implantation for NPH. The mean EI was 0.432 (95% CI, 0.393-0.471) preoperatively and 0.419 (95% CI, 0.373-0.466) postoperatively (p = 0.066). There is a decrease of the ONSD during positional changes from supine to upright position and pre- and postoperative EI correlated with preoperative variation ONSD_V1 (r = - 0.610 and - 0.648, p < 0.05). The mathematical function for preoperative EI estimation was EIpreop = 0.504 - 0.022 × ONSD_V1 + 0.101 × gender (M = 0; W = 1), (Durbin-Watson value = 1.94), and for postoperative was EIpostop = 0.487 - 0.022 × ONSD_V1 + 0.117 × gender; (Durbin-Watson value 2.23). CONCLUSIONS: Ultrasonographic ONSD measurements in supine and upright position provide a potential method to quantify EI that can be conducted at the bedside.
OBJECTIVES: We aimed to quantitatively assess Evans index (EI) using ultrasonographic optic nerve sheath diameter (ONSD) measurements in supine and upright position in normal pressure hydrocephalus (NPH) patients. METHODS: Ultrasonographically ONSD was measured in a supine and upright position before and 4-5 days after the ventriculoperitoneal shunt surgery. The changes of the ONSD between supine and upright positions were calculated as ∆ONSD = sONSD-uONSD and as the variation ONSD_V = 100% × [(sONSD - uONSD)/sONSD]. Multiple linear regression analyses were conducted to assess associations between EI and the variation of ONSD. We derived the mathematical function to predict EI. Bland-Altman analysis was applied to evaluate the accuracy and precision of the EI prediction. RESULTS: Thirteen adult patients (mean age 61.8 ± 11.1 (SD) years; 6 (46%) female) undergone VP shunt implantation for NPH. The mean EI was 0.432 (95% CI, 0.393-0.471) preoperatively and 0.419 (95% CI, 0.373-0.466) postoperatively (p = 0.066). There is a decrease of the ONSD during positional changes from supine to upright position and pre- and postoperative EI correlated with preoperative variation ONSD_V1 (r = - 0.610 and - 0.648, p < 0.05). The mathematical function for preoperative EI estimation was EIpreop = 0.504 - 0.022 × ONSD_V1 + 0.101 × gender (M = 0; W = 1), (Durbin-Watson value = 1.94), and for postoperative was EIpostop = 0.487 - 0.022 × ONSD_V1 + 0.117 × gender; (Durbin-Watson value 2.23). CONCLUSIONS: Ultrasonographic ONSD measurements in supine and upright position provide a potential method to quantify EI that can be conducted at the bedside.
Authors: Jens Fichtner; Christian T Ulrich; Christian Fung; Debora Cipriani; Jan Gralla; Eike Immo Piechowiak; Felix Schlachetzki; Werner J Z'Graggen; Andreas Raabe; Jürgen Beck Journal: Cephalalgia Date: 2018-08-12 Impact factor: 6.292
Authors: Mohammed Ali Alvi; Desmond Brown; Yagiz Yolcu; Jad Zreik; Saad Javeed; Mohamad Bydon; Jeremy K Cutsforth-Gregory; Jonathan Graff-Radford; David T Jones; Neill R Graff-Radford; Petrice M Cogswell; Benjamin D Elder Journal: World Neurosurg Date: 2020-09-08 Impact factor: 2.104