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. 2024 Jan 10;10:2. doi: 10.1186/s42234-023-00134-1

Fig. 8.

Fig. 8

The effect of closed-loop spinal cord stimulation (CL-SCS) on mechanical (A, B) and cold (C, D) hypersensitivity was assessed using the von Frey and acetone tests. A Mean log10 thresholds (T, in grams) and (C) paw withdrawal latencies before SNI surgery (BS1), before lead implantation (BS2), and at 0, 15, 30, 45 and 60 min after the onset of CL-SCS delivery. The dotted lines represent spared nerve injury (SNI) surgery and lead implantation (IMPL). The pattern in the background represents the time that CL-SCS was delivered. A CL-SCS provided a significant reduction of mechanical hypersensitivity in the SNI SCS-ON animals when compared to the SNI (15 and 30 min: p < 0.001) and SNI SCS-OFF (15 and 30 min: p < 0.001) animals. C CL-SCS provided a significant reduction of cold hypersensitivity in the SNI SCS-ON animals when compared to the SNI SCS-OFF (15 min: p = 0.004, 30 min: p = 0.007) animals. B, D The area under the curve (AUC) for 0–30 min (left panel) and 30–60 min (right panel) time points, summarizing the measurements in (A) and (C). Data are presented as mean ± SEM, n = 6–7. p < 0.05 (corrected) was used as the significance level (one and two-way ANOVA, t-test). * denotes significance compared to SNI SCS-ON. Sham animals received no SNI surgery and no lead implantation (sham), or no stimulation (sham SCS-OFF) or were subjected to CL-SCS (sham SCS-ON). SNI animals received SNI surgery and no lead implantation (SNI), or no stimulation (SNI SCS-OFF) or were subjected to CL-SCS (SNI SCS-ON)