Development of Adaptive Deep Brain Stimulation for OCD (Phase 1a)

"DBS system consists of the Activa PC+S Neurostimulation System:~Model 37604 Activa PC+S Neurostimulator Model 37087 DBS Extension Model 37441 Patient Programmer Model 8181 Sensing Programmer Model 8180 Sensing Programmer Software Nexus D2/D3 System Nexus D2/D3 Application Programming Interface (API) Dow Corning Medical Adhesive, Medtronic Part #080118 Model 3387/3389 DBS Leads Model 37022 External Neurostimulator Model 8840 N'Vision Clinician Programmer Model 8870 Application Card Model 37642 Patient Programmer Model 37092 Patient Programmer Antenna"

"The subject and Independent Evaluators are blinded to timing of discontinuation. In all cases, the sequence will be as follows in one-week segments: 100% Active, 50% Active, Sham and Sham. Subjects will be seen weekly. Amplitude will be reduced by 50% at start of week 2 and turned off at start of week 3. Subjects will be told that DBS will be discontinued at some point during the 4 weeks. The purpose of the 50% initial reduction is to minimize rebound effects. The programmer (not the PI in this case) will be open to the design and perform sham activation as described previously. Relapse is defined as a 25% increase of the Y-BOCS over two consecutive visits compared to discontinuation baseline."