alexa Neurologic prognostication and bispectral index monitoring after resuscitation from cardiac arrest.
Medicine

Medicine

Emergency Medicine: Open Access

Author(s): Leary M, Fried DA, Gaieski DF, Merchant RM, Fuchs BD,

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Abstract OBJECTIVE: While the use of therapeutic hypothermia (TH) has improved outcomes after resuscitation from cardiac arrest, prognostication of survival and neurologic function remains difficult during the post-arrest time period. Bispectral index (BIS) monitoring, a non-invasive measurement of simplified electroencephalographic data, is increasingly being considered for post-arrest neurologic assessment and outcomes prediction, although data supporting the technique are limited. We hypothesized that BIS values within 24 h after resuscitation would correlate with neurologic outcomes at discharge. METHODS: We prospectively collected BIS data in consecutive patients initially resuscitated from cardiac arrest and treated with TH in one academic medical center. We assessed BIS values in context of cerebral performance category (CPC) assessment on the day of discharge. RESULTS: Data were collected in 62 post-arrest patients, of whom 26/62 (42\%) survived to hospital discharge. Mean BIS values at 24 h post-resuscitation were significantly different in the survivors with CPC 1-2 ("good" outcome) vs those with CPC 3-5 ("poor" outcome) or death during hospitalization (49+/-13 vs 30+/-20; p<0.001). Receiver operator characteristic analysis suggested that 24 h BIS was most predictive of CPC 1-2 outcome compared to the other timepoints; a BIS cutpoint of 45 exhibited a sensitivity of 63\% and a specificity of 86\%, with a positive likelihood ratio of 4.67. Sixteen patients exhibited a BIS of zero during at least one timepoint; all of these patients died during hospitalization. CONCLUSIONS: BIS monitoring values at 24 h post-resuscitation are correlated with neurologic outcomes in patients undergoing TH treatment. In 16/62 patients, a BIS of zero at any timepoint was observed, which was uniformly correlated with poor outcome after resuscitation from cardiac arrest; however, a non-zero BIS is insufficient as a sole predictor of good neurologic survival. Copyright 2010 Elsevier Ireland Ltd. All rights reserved. This article was published in Resuscitation and referenced in Emergency Medicine: Open Access

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