Systems and methods for treating a patient having acute decompensated heart failure (ADHF) using electrical stimulation are disclosed. A representative method for treating a patient includes positioning an implantable signal delivery device proximate to a target location at or near the patient's spinal cord within a vertebral range of about T1 to about T12, directing an electrical therapy signal to the target location via the implantable signal delivery device, wherein the electrical signal has a frequency in a frequency range of from 1.2 kHz to 100 kHz to modulate one or more of the patient's sympathetic nerves and treat the patient's ADHF.
