study of correlation of glasgow coma score and bispectral index in mild and moderate traumatic brain injuries

study of correlation of glasgow coma score and bispectral index in mild and moderate traumatic brain injuries     feizi a [1] , jarineshin h* [2] , estabragnia h [3] , mahoori a [4] , khalkhali h [5] , sattari s [6]     received: 3july, 2011 accepted: 23september, 2011     abstract   background & aims : it is important to monitor the state of consciousness in patients suffering from traumatic brain injuries (tbi) in order to determine the modes of care, treatment and prognosis. currently, glasgow coma scale (gcs), which has been criticized for inefficiency, is the most common tool for measurement of level of consciousness. therefore, the present study was conducted to investigate the correlation between gcs and bis in mild and moderate brain injuries.   materials & methods : this descriptive-correlational study included forty-seven patients with mild and moderate tbi being admitted to neurosurgical and general icu. gcs and bis were measured every 60 and 15 minutes, respectively, for 6 hours. a pearson's correlation coefficient was used to determine whether the gcs correlated with bis scores.   result : forty men and seven women participated in this study. the most common cause of tbi was road traffic injuries (83%) and the most common consequence was diffuse axonal injury (dai). a significant correlation was found between gcs and bis (r=0.36, p=0.014). regression line equation for two variables was also plotted.   conclusion : despite the significant correlation between gcs and bis scores, the quantities of coefficient of correlation and coefficient of determination were low. moreover, variability among bis scores according to each specified value of gcs makes the use of this score difficult for monitoring the level of consciousness in tbi.   keywords : intensive care unit, glasgow coma score, traumatic brain injury , decreased level of consciousness , bispecteral index     address: department of icu, shahid mohammadi hospital, bandarabbass, iran   tel: (+98)9173613464   email: [email protected]   [1] assistant professor of nursing, nursing and midwifery faculty, urmia university of medical sciences, urmia, iran  [2] assistant professor of anesthesiology, hormozgan university of medical sciences, hormozgan, iran (corresponding author)  [3] msc student in nursing, nursing and midwifery faculty, urmia university of medical sciences, urmia, iran  [4] associate professor of anesthesiology, medicine faculty, urmia university of medical sciences, urmia, iran  [5] assistant professor of medical statistics, health faculty, urmia university of medical sciences, urmia, iran  [6] general practitioner, emergency center of bandarabbass, hormozgan, iran