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Abstract

Objective: The objective of the study is to determine the validity of bispectral in diagnosis of mild and moderate head injury keeping GCS as a gold standard.Study Design: A cross sectional validation study.Place and Duration of Study: This Study was conducted in main Intensive Care Unit of the Combined MilitaryHospital Rawalpindi and was carried out over eight months from Dec 2009 to Aug 2010.Material and Methods: A minimum of 137 patients were included in study. At the time of admission, Glasgowcoma score was calculated by 3 different anesthetists and mean was calculated. At the same time BIS reading was taken using Aspect BIS monitor.Results: Mean age of the patients was 29.5 ± 6.2. 108 (78.8%) patients were male while 29 (29.2%) patients were female. Mean glasgow coma score was 12.2 ± 0.9 and mean bispectral index score was 69.9 ± 8.4. A 2 x 2 table was made between GCS and BIS. Sensitivity was found to be 95.65%, specificity 98.53%, positive predictive value 98.50% and negative predictive value 95.7%. ROC curve was drawn and demonstrated area under curve value of 0.999.Conclusion: BIS monitor can prove to be a useful adjunct in the diagnosis and management of mild and moderate head injury patients in the intensive care units.