1. A patient survivability prediction system comprising: a hand-held device comprising a first input to receive a first set of parameters relating to heart rate variability data of a patient based on electrocardiogram (ECG) signals from a patient, and a second input to receive a second set of parameters relating to vital sign data of the patient; a memory module to store the first set of parameters and the second set of parameters; a third input to receive a third set of parameters including at least one of demographic information of the patient and medical history information of the patient; at least one processor coupled to the memory module and configured to analyze the first set of parameters, the second set of parameters, and the third set of parameters and output a prediction on the survivability of the patient over a predetermined period of time based on the first set of parameters, the second set of parameters, and the third set of parameters; and a display coupled to the at least one processor to display the prediction on the survivability of the patient over the predetermined period of time.