Okay, I just found this on the Medtronics website under a Q&A about
patient selection for neurostimulation:
"Q: Is a psychological evaluation a requirement for patient selection?
A: Psychological factors have a significant influence on many chronic pain disorders. Psychological evaluation serves several purposes. It can identify psychological "risk" factors; facilitate treatment of these risk factors; facilitate patient selection to the extent to which there
is a physiological origin of pain; and provide insight into a patient's response to a screening test or treatment. The need for psychological evaluation will vary according to the nature of the patient and the nature of the pain being treated.
Psychological evaluation may be invaluable in an individual with non-cancer pain, especially if the patient's history suggests the presence of psychological factors that might complicate a good outcome.
Psychological factors that are considered exclusions for implantation include active psychosis, major uncontrolled depression or anxiety, active suicidal or homicidal behaviour
, serious drug or alcohol addiction problems, and serious cognitive deficits. Other factors that may be cause for exclusion or caution include unusual pain ratings, certain personality disorders (e.g., borderline or antisocial), somatisation, litigation related to the pain disorder, lack of social support, and unrealistic outcomes expectations. In some cases, these factors can be viewed as risk factors, rather than exclusionary criteria, and might be modified through psychological intervention to promote a good outcome.
The role of the psychological evaluation is not to "rule in" or "rule out" a patient, but to identify patients in whom overall quality of life is likely to be significantly improved by a treatment plan that includes neurostimulation. The frequency with which a psychologist identifies previously unrecognised risk factors varies with the experience and expertise of the referring physician and the psychologist, but is sufficiently common to warrant psychological evaluation of most,
if not all, candidates for neuromodulation therapies."www.medtronic.com/IN/physicians/pain/neuro/faq.html