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Biomarkers may aid in patient selection and optimisation of this invasive treatment. In this trial, we intend to evaluate neurocognitive function related to STN and related biosignatures as potential biomarkers for STN DBS in OCD.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and analysis<\/jats:title>\n                    <jats:p>Twenty-four subjects with treatment-refractory OCD will undergo open-label STN DBS. Structural\/functional imaging, electrophysiological recording and neurocognitive assessment would be performed at baseline. The subjects would undergo a structured clinical assessment for 12 months postsurgery. A group of 24 healthy volunteers and 24 subjects with treatment-refractory OCD who receive treatment as usual would be recruited for comparison of biomarkers and treatment response, respectively. Baseline biomarkers would be evaluated as predictors of clinical response. Neuroadaptive changes would be studied through a reassessment of neurocognitive functioning, imaging and electrophysiological activity post DBS.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Ethics and dissemination<\/jats:title>\n                    <jats:p>The protocol has been approved by the National Institute of Mental Health and Neurosciences Ethics Committee. The study findings will be disseminated through peer-reviewed scientific journals and scientific meetings.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2020-047492","type":"journal-article","created":{"date-parts":[[2021,6,22]],"date-time":"2021-06-22T12:05:48Z","timestamp":1624363548000},"page":"e047492","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":7,"title":["Identification of biomarkers that predict response to subthalamic nucleus deep brain stimulation in resistant obsessive\u2013compulsive disorder: protocol for an open-label follow-up study"],"prefix":"10.1136","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5641-454X","authenticated-orcid":false,"given":"Shyam Sundar","family":"Arumugham","sequence":"first","affiliation":[{"name":"Department of Psychiatry, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, 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