System and method for determining a stimulation threshold for closed loop spinal cord stimulation

A non-transitory computer-readable medium comprising instructions that, when executed by a processor of an implantable pulse generator (IPG), cause the processor to perform operations comprising:

• delivering a series of SCS pulses to nerve tissue of interest, the series of SCS pulses configured to form a plurality of SCS waveforms in accordance with SCS therapy parameters, wherein the SCS pulses are delivered to the nerve tissue of interest via at least one lead electrode of a lead coupleable to the IPG, the at least one lead electrode configured to be implanted at a target position proximate to or within the nerve tissue of interest;
• determining an evoked compound action potential (ECAP) amplitude based on an ECAP waveform resulting from the SCS pulses;
• increasing one or more of the SCS therapy parameters;
• iteratively repeating the delivering, determining and increasing until the ECAP amplitude exhibits a downward trend divergence;
• and
• defining a stimulation threshold based on the ECAP amplitude at the downward trend divergence.