1. A method for treating a patient, comprising: reducing or modifying an organ dysfunction of an identified organ in the patient by applying or directing application of an electrical signal to a spinal cord of the patient via an implanted signal delivery device, at a vertebral level associated with the identified organ, the electrical signal having a frequency of from about 1.5 kHz to about 100 kHz, wherein reducing or modifying the organ dysfunction includes modifying an imbalance in the patient's autonomic system by normalizing a combined effect of the patient's sympathetic and parasympathetic systems.