Sustained improvement of obsessive–compulsive disorder by deep brain stimulation in a woman with residual schizophrenia

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Co-occurrence of obsessive–compulsive disorder (OCD) and schizophrenia is not rare (Eisen et al., 1997). Given that the obsessional content is not related to psychotic subject matter, both disorders can be regarded as delimitable diagnostic entities (Bottas et al., 2005). Recently, a number of case reports and small case series have demonstrated that deep brain stimulation (DBS) targeting the fronto-striato-thalamic circuit can have beneficial effects on OCD (Abelson et al., 2005; Greenberg et al., 2006; Sturm et al., 2003). DBS treatment of patients with current or past psychotic disorders has not yet been reported. Here, we present a comprehensive clinical evaluation of a woman with intractable OCD and residual symptoms of schizophrenia that were treated with unilateral DBS of the right nucleus accumbens (NAc), including neuropsychological long-term follow-up, neurophysiological measurements and functional brain imaging. This 51-yr-old right-handed woman suffered from a severely disabling, chronic and intractable form of OCD with excessive hand washing, cleaning, rearrangement of objects and compulsory praying [Yale–Brown Obsessive Compulsive Scale (YBOCS) score 32/40, 1 month prior to treatment]. Psychosocial functioning as measured by the GAF (Global Assessment of Functioning) scale was severely impaired (31/100). The symptoms started during childhood and accumulated during her early twenties. Obsession consisted of preoccupation with thoughts about guilt and purgation. Later in the course of the disease, psychotic symptoms (delusions, hallucinations, disorganized behaviour) meeting DSM-IV criteria for schizophrenia occurred transiently. The remaining presence of a few odd beliefs, minor paranoid ideation and disorganized behaviour in an attenuated form that were unrelated to the obsessions and compulsions led to the diagnosis of residual schizophrenia according to DSM-IV using SCID (Structured Clinical …