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What is it?
Spinal cord stimulation (SCS) is a form of therapeutic neuromodulation, defined by the International Neuromodulation Society as “the alteration of nerve activity through targeted delivery of a stimulus, such as electrical stimulation or chemical agents, to specific neurological sites in the body.”
A spinal cord stimulator is a medical device which is used to treat severe nerve pain. It consists of a small battery pack which is surgically inserted beneath the skin and is connected to a lead placed near the spinal cord. The battery sends electric signals to the lead in the epidural space next to the spinal cord altering the long-standing pain signals often reducing the perception of pain and subsequently improving the patient’s quality of life.
Historically spinal cord stimulators used a system which caused tingling in the painful area often helping to mask some of the pain but this is no longer necessary. Many newer systems are free of this tingling sensation. As the science has evolved, so has technology and many systems have long-lasting batteries or ones that can be recharged. There are several reputable medical companies who produce spinal cord stimulators. The most appropriate will be selected for everyone treated by the PAIN Team at Leeds.
Trial vs. full system
A spinal cord stimulator can be trialled for a few weeks to assess its effectiveness or fully inserted at the first sitting. The trial system allows patients to have a test run before committing to a full system but can involve additional delays and further surgical procedures. The decision on the most appropriate for each patient is made on an individual basis by a multidisciplinary team and will be discussed before committing to any procedure.
How is it inserted?
A spinal cord stimulator is inserted as a surgical procedure in a clean operating theatre. It is usually performed as a day case procedure and patients are allowed home the same day. Patients lie face down on an operating table and using x-ray guidance, the lead is placed through the skin into the appropriate place in the epidural space.
For a trial, the lead comes out of the back to an external battery.
For a fully implanted system, the lead is tunnelled under the skin to a battery placed under the skin normally in the chest or buttock.
To safely place this, the patient is required to be awake, and to ensure comfort during the procedure, local anaesthetic, strong pain killers and sedation are used under the supervision of an anaesthetist.
Psychology assessment
As part of the process for spinal cord stimulator trial and/or implantation, patients might be referred to psychology for an assessment. Having SCS surgery is a big decision and is sometimes an emotional process. The Leeds PAIN Team is committed to ensure that the risk of psychological harm to patients is acceptably small and that patients are fully supported throughout this process.
The psychological assessment is an opportunity to explore the decision to have surgery and to discuss any associated social and psychological issues e.g. worries, impact on family and relationships, psychological well-being and support needs. It can help to identify if patients need any extra support before or after the surgery, to ensure that patients have a good outcome from the surgery.
Potential issues and/or complications
Complications can occur at the time of insertion or after many years. These risks are generally rare but include serious complications such as paralysis, serious spinal or neurological infection and severe allergic reaction to drugs. These will be discussed on an individual basis by the PAIN Team, and patients will be given an opportunity to reflect and ask questions before committing to any intervention.