1. A method for determining an increased risk of death of a patient comprising the steps of:a. receiving electrocardiogram (ECG) data of the patient generated during a first time period;
b. receiving electroencephalogram (EEG) data of the patient generated during the first time period;
c. composing a feature of the ECG data and a feature of the EEG data over a common time frame, wherein the feature composed from the EEG or ECG data is at least one from the group consisting of mean, standard deviation, Kurtosis, skewness, autoregressive modeling coefficients, Vector autoregressive modeling coefficients, Barlow parameters, Teager energy, Hjorth parameters, Pearson product-moment correlation coefficient, Rank correlation, spectral band power at specific frequencies/frequency bands, normalized spectral band power, spectral edge frequency, median frequency, coherence, directed transfer function, partial coherence, directed coherence, generalized partial directed coherence, Shannon entropy, approximate entropy, sample entropy, spectral entropy, mutual information, transfer entropy, Lyapunov exponents, correlation dimension, recurrence quantification analysis, dynamical entrainment, non-linear interdependence, detrended fluctuation analysis, Hurst exponent, Lempel-Ziv complexity, phase synchronization, phase-amplitude coupling, bispectrum, and bicoherence;
d. determining a statistical measure of association between features of the ECG data and the EEG data;
e. determining whether the statistical measure of association exceeds a predetermined threshold, thereby indicating whether the increased risk of death is present;
f. in response to an indication of the increased risk of death, either (i) delivering a series of electrical signals to therapeutically counter-act brain electrical impulses related to seizures; or (ii) administering a therapeutic drug to the patient; and
g. wherein the patient suffers from at least one condition from the group consisting of epileptic seizures, status epilepticus, sudden infant death syndrome, sudden unexpected death in epilepsy, and sudden arrythmic death syndrome.