The Stroop Color-Word Test (SCWT) was used to obtain a measure of mental speed and response inhibition. Verbal fluency (VF) was measured by both category (animals and occupations) and letter (three letters) fluency.
The neuropsychological test battery consisted of the Boston Naming Test (BNT) for visual naming and the Rey Auditory Verbal Learning Test (RAVLT) for memory assessment. Table 1 presents patient demographics and clinical outcome as measured by the Yale-Brown Obsessive Compulsive Scale (YBOCS).
The mean follow-up time was 18 months ± 8.6 (SD). As part of routine clinical evaluation and follow-up, all patients received a neuropsychological test battery at baseline and at follow-up. All patients were finally implanted with bilateral quadripolar electrodes (model 3387 Medtronic, Fridley, MN) along the central trajectory with variable contact points on target, which were subsequently connected to an implantable pulse generator (IPG) (Activa PC, Medtronic). The target was adjusted based on the patient's individual anatomy. The planned target was the VC/VS with the stereotactic coordinates: (−) 6 lateral of the middle of the bi-commissural line (mid AC-PC), 12 mm anterior of the mid AC-PC, and −3 mm under the bi-commissural line. In this retrospective cohort, seven patients were selected for DBS in the period of 2014–2019 that have been described previously.
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