Can nerve zapping predict who gets pain relief from shingles?

This study looked at 77 adults with long-term nerve pain after shingles (postherpetic neuralgia) to see if a spinal nerve stimulation device works better for certain types of pain. Researchers grouped patients by their pain features and measured pain levels, quality of life, and nerve pain scores. The goal was to find which patients are most likely to benefit, so the treatment can be used more wisely.