title: Cognitive functioning, emotional processing, mood, and personality variables before and after stereotactic surgery: a study of 8 cases with chronic neuropathic pain.
abstract: BACKGROUND
  Stereotactic central lateral thalamotomy (CLT) has been applied as a treatment for chronic intractable neuropathic pain. However, it is not clear whether this intervention influences the emotional and cognitive impairments observed in patients who have chronic neuropathic pain.
  
  
  OBJECTIVE
  To investigate neuropsychological functions and emotional processing in patients with chronic neuropathic pain compared with healthy volunteers and to explore the neuropsychiatric effect of the CLT.
  
  
  METHODS
  We investigated pain ratings, cognitive functions, emotional processes, and personality variables before and after surgery in 8 patients with intractable neuropathic pain. Patients were tested before and 3 months after CLT by the use of neuropsychological tests; clinical scales for depression, anxiety, anhedonia, and anger regulation; a personality test; and 2 experimental tasks testing the theory of mind as well as the ability to recognize facial emotional expressions. Nine age- and sex-matched control subjects were tested once using the same procedure.
  
  
  RESULTS
  The comparison of the patient group before surgery with the control group evidenced significant differences on the cognitive assessments, the depression and anxiety scores, as well as on the somatic complaint subscale of the personality test. Three months after CLT, patients experienced a significant improvement in their depression scores. There were no additional postsurgical cognitive impairments.
  
  
  CONCLUSIONS
  For our patients with chronic neuropathic pain, CLT provided pain relief and reduction of their depression scores without causing postsurgical cognitive impairments.
authors.affiliation: Department of Psychiatry and Psychotherapy, University Hospital Zurich, Zurich Switzerland.
authors.forename: Roberto
authors.initials: R
authors.lastname: Pirrotta
authors.forename: Daniel
authors.initials: D
authors.lastname: Jeanmonod
authors.forename: Salome
authors.initials: S
authors.lastname: McAleese
authors.forename: Christoph
authors.initials: C
authors.lastname: Aufenberg
authors.forename: Klaus
authors.initials: K
authors.lastname: Opwis
authors.forename: Josef
authors.initials: J
authors.lastname: Jenewein
authors.forename: Chantal
authors.initials: C
authors.lastname: Martin-Soelch
mesh_terms: D000342:Affective Symptoms / Q000175:diagnosis / Q000209:etiology*; D059350:Chronic Pain / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D003072:Cognition Disorders / Q000175:diagnosis / Q000209:etiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009437:Neuralgia / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D010147:Pain Measurement; D010552:Personality Assessment; D013238:Stereotaxic Techniques / Q000009:adverse effects*; D013788:Thalamus / Q000601:surgery*; D016896:Treatment Outcome