Impact of Wait times on Spinal Cord Stimulation Therapy Outcomes

Abstract

Presently, the long-term success rate of spinal cord stimulation (SCS) ranges from 47% to 74%. SCS efficacy is inversely proportional to the passage of time between development of chronic pain syndrome and time of implantation. To improve outcomes, implantation should be performed early. This study identifies sources of delay and offers suggestions for improvement. A retrospective analysis of 437 SCS patients examines delays to accessing SCS at various points in the referral stream, from initial diagnosis, family physician, and various specialist treatments, to implantation. Analysis of variance evaluated the effect of age, sex, treating specialty, and their interactions on implantation delay. A multiple linear regression model was developed to assess factors contributing to implantation delay. From time of onset of chronic pain to implantation, patients endured a delay of 65.4±2.04months. Initial physician contact occurred at a mean of 3.4±0.12months after development of pain syndrome. Family physicians managed cases for 11.9±0.45months and various specialists for an additional 39.8±1.22months. Neurosurgeons were quickest to refer to an implant physician (average wait-time 32.28± 2.64months), while orthopedic surgeons and nonimplanting anesthesiologists took the longest, contributing to wait times of 51.60±5.04months and 58.08±5.76months, respectively. Once the decision for implantation was made, the implanting physician required 3.31±0.09months to organize the procedure. A gradual decline in wait times was observed from 1980 to present. To improve SCS success rates, physicians involved in the treatment for chronic pain should refer these cases early to an implant physician once failure of medical management becomes apparent.