Key result
Hypothermic resuscitation yields greater EEG information quantity vs normothermia in rodents after cardiac arrest.
Why the study?
Does hypothermic resuscitation improve neurological recovery measured by EEG information quantity in rodents after cardiac arrest?
Does hypothermic resuscitation improve neurological recovery measured by EEG information quantity in rodents after cardiac arrest?
Mean Difference: 0.2 (95% CI 0.09–0.31)
Hypothermia accelerates electrical recovery from brain injury after cardiac arrest in a rodent model, as measured by a novel EEG information quantity metric.
May support EEG monitoring of post-arrest recovery during hypothermia; leaves open prospective validation for outcome prediction.
In this paper, we provide a quantitative electroencephalogram (EEG) analysis to study the effect of hypothermia on the neurological recovery of brain after cardiac arrest. We hypothesize that the brain injury results in a reduction in information of the brain rhythm. To measure the information content of the EEG a new measure called information quantity (IQ), which is the Shannon entropy of decorrelated EEG signals, is developed. For decorrelating EEG signals, we use the discrete wavelet transform (DWT) which is known to have good decorrelating properties and to show a good match to the standard clinical bands in EEG. In measuring the amount of information, IQ shows better tracking capability for dynamic amplitude change and frequency component change than conventional entropy-based measures. Experiments are carried out in rodents (n = 30) to monitor the neurological recovery after cardiac arrest. In addition, EEG signal recovery under normothermic (37 degrees C) and hypothermic (33 degrees C) resuscitation following 5, 7, and 9 min of cardiac arrest is recorded and analyzed. Experimental results show that the IQ is greater for hypothermic than normothermic rats, with an IQ difference of more than 0.20 (0.20 +/- 0.11 is 95% condidence interval). The results quantitatively support the hypothesis that hypothermia accelerates the electrical recovery from brain injury after cardiac arrest.
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Shin et al. (2006) studied Cardiac arrest (n=30). Hypothermic resuscitation vs. Normothermic (37 degrees C) resuscitation was evaluated on Information quantity (IQ) of EEG signals (MD 0.20, 95% CI 0.09-0.31). Hypothermic resuscitation (33°C) yielded a greater information quantity of EEG signals compared to normothermic resuscitation in rodents after cardiac arrest (mean difference 0.20; 95% CI 0.09-0.31).
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