Two-Year Outcomes Using Fast-Acting, Sub-Perception Therapy for Spinal Cord Stimulation: A European, Real-World, Multicenter Experience

<b>Background/Objectives:</b> Over the last 20 years, spinal cord stimulation (SCS) has seen the development of various paresthesia-free paradigms. Recently, a novel modality has emerged (Fast-Acting Sub-perception Therapy, FAST) that engages the surrounding inhibition mechanism of action. We evaluated long-term, real-world outcomes of preferential FAST-SCS use in patients with chronic pain. <b>Methods:</b> In this multi-center, observational, consecutive case series, medical chart data from chronic pain patients preferentially using FAST-SCS (no exclusions) were retrospectively reviewed. <b>Results:</b> Data from 167 patients in 13 European centers were analyzed; 74% of patients suffered from persistent spine pain syndrome type 2 and 87% presented with low back and/or leg pain. At the last follow-up (mean 1.6 years), the numerical rating scale (NRS) overall pain score decreased by 5.1 ± 2.5 points versus baseline, from 8.0 ± 1.2 to 2.9 ± 2.2 (n = 167, <i>p</i> < 0.0001). 87% of patients reported ≥50% pain relief, and 55% were "high responders" with overall NRS pain scores ≤2/10. At the last follow-up, functional disability improved significantly (the Oswestry Disability Index reduced by 29.2 ± 21.5 points, n = 65, <i>p</i> < 0.0001) and patients had a significant gain in quality of life (EQ-5D-5L visual analog scale increased by 52.0 ± 26.9 points, n = 86, <i>p</i> < 0.0001). Results at the 2-year follow-up showed a sustained, substantial reduction in pain; 67% of patients were high responders and the NRS overall pain score decreased by 5.6 ± 2.4 versus baseline (n = 52, <i>p</i> < 0.0001). <b>Conclusions:</b> Our real-world outcomes suggest that in patients with chronic low back and/or leg pain, FAST-SCS therapy provided durable and profound pain relief and led to significant improvements in disability and quality of life.