No evidence for DBS
This was the full text from NICE's recommendations:

1.1   Evidence on the safety and efficacy of deep brain stimulation for chronic, severe, treatment-resistant obsessive-compulsive disorder (OCD) in adults is inadequate in quality and quantity. Therefore, this procedure should only be used in the context of research.

1.2   Patient selection should be done by a multidisciplinary team experienced in managing OCD. It should include experts in psychiatry, neuropsychiatry, clinical psychology, neurology, neurosurgery and deep brain stimulation.

1.3   The procedure should only be done in centres with expertise in deep brain stimulation and experience in managing OCD.

1.4   Further research should primarily be randomised controlled trials. It should clearly define the area of the brain that should be targeted in this procedure. It should also describe details of patient selection, comorbidities, and use of adjunctive therapies. Outcomes should include reduction in OCD symptoms, improvement in quality of life and any neuropsychiatric and cognitive effects.

OCD-UK Comment
OCD-UK welcome NICE’s interventional guidance placing emphasis on both the lack of and the poor quality of existing research data around the use of Deep Brain Stimulation for OCD. We also welcomed the fact NICE also highlighted the lack of evidence on the overall safety of the procedure, concerns OCD-UK have had about DBS since our own inception back in 2004.   Whilst we remain open to new treatment options for people suffering because of OCD, we must remain committed to ensuring those treatment options are safe, appropriate and ethical, both for treatment and research.

The National Institute for Health and Care Excellence (NICE) provides national guidance and advice to improve health and social care across the NHS. The interventional procedures guidance looks at procedures used for diagnosis or treatment. It considers if they are safe and work well enough for wider use in the NHS.