Selective Radiofrequency Stimulation of the Dorsal Root Ganglion (DRG) as a Method for Predicting Targets for Neuromodulation in Patients With Post Amputation Pain: A Case Series

DRG FOCUS: A Multicenter Study Evaluating Dorsal Root Ganglion Stimulation and Predictors for Trial Success

“… Illustration of DRG and connectivity to adjacent demonstrating upstream and downstream effects of DRGS as well as proposed mechanism for “crosstalk.” In addition to the dorsal horn, upstream communication may also be possible through the primary nociceptive afferents carried by the sympathetics upstream to the DRG at multiple levels via the White Communicating Rami. Downstream communication may be made possible through the dorsal horn and the Gray Communicating Rami . DRGS, dorsal root ganglion stimulation.…”

“…Unfortunately, the sample sizes were too small to draw adequate conclusions however patterns were observed: Pelvic pain (i.e. pudendal neuralgia)—bilateral L1 and S2 DRG as was mentioned above for the “Pelvis.” PAP—radiofrequency mapping technique described by Hunter et al . Discogenic pain—the affected disc level was predetermined before the trial using a combination of imaging and provocative discography. Subsequently, the DRG above and below the affected disc, bilaterally, were chosen for stimulation. PHN—the DRG above and below the affected level were targeted. …”

“…pudendal neuralgia)-bilateral L1 and S2 DRG as was mentioned above for the "Pelvis." • PAP-radiofrequency mapping technique described by Hunter et al (24). • Discogenic pain-the affected disc level was predetermined before the trial using a combination of imaging and provocative discography.…”

Dorsal Root Ganglion Stimulation for Chronic Pelvic Pain: A Case Series and Technical Report on a Novel Lead Configuration

“…DRGS was a significant innovation in the neuromodulation space, mainly for its ability to provide focal coverage over specific body parts, like the foot, and for its ability to work at the level of the T‐junction in the DRG to potentially reverse allodynia at the source . DRGS achieved a level of clinical efficacy far exceeding that of SCS for a wide range of painful, complex neuropathic conditions .…”

Dorsal Root Ganglion Stimulation (DRGS) for the Treatment of Chronic Neuropathic Pain: A Single-Center Study with Long-Term Prospective Results in 62 Cases

“…We used such additional selective nerve root infiltrations in about 10% of our patients, prior to the implantation of our test-stimulation electrodes. Selective radiofrequency stimulation of the DRG is another method used in order to predict targets for DRGS (17). This is an elegant technique used for the purpose of identifying the nerve roots and associated skin areas, without causing additional neurological impairment, such as temporary sensory deficits.…”