cognitive therapy for distressing visual hallucinations: a pilot study

Conditions: Visual Hallucinations; Psychotic Disorders

Summary: the study is a pilot study of cognitive therapy for people with psychosis who have distressing visual hallucinations. the aim is to evaluate whether this is an acceptable, feasible and effective treatment. this is a pilot study and there is no randomisation to either cbt or treatment as usual (tau). if a participant is allocated to the cognitive therapy plus tau condition then the participant will meet with a therapist on initially a weekly basis and receive up to 8 sessions of cbt over a 2 month period. the participant will also have regular assessments conducted by a researcher who is independent to the treatment group. it is predicted that those people receiving cbt will improve on measures of symptoms, and particularly for measures of visual hallucinations.

cognitive behavioural therapy (cbt) has been proven to be effective in helping people with distressing psychotic symptoms such as auditory hallucinations or upsetting delusional beliefs. while the majority of hallucinations reported in psychotic disorders are auditory, visual hallucinations (vh) have been reported in 16%-72% of people with psychotic disorders like schizophrenia and schizoaffective disorder. vh appear to be associated with particularly high levels of distress, and impairment. the global severity of illness was significantly higher in people with schizophrenia and vh, as compared to those people without vh. whilst antipsychotic medication is the first line of treatment for psychotic symptoms like vh, there is evidence that many service users choose to refuse or discontinue their pharmacological treatment. for example, the largest trial to compare atypical antipsychotics found that 74% of patients with a diagnosis of schizophrenia discontinued their medication over 18 months. hence, there is a need to develop a range of effective treatments. despite its value in treating auditory hallucinations, at present there is no specific cbt treatment for vh. we developed a cognitive behavioural model for visual hallucinations. this model has been tested in a recent study of 15 people with psychosis and distressing visual hallucinations which found that it was not the presence of the visual experience per se that led to the distress but the appraisal of it (as being a threat to psychological or physical wellbeing). such appraisals are targeted in cbt for auditory hallucinations. the aim of this research is to assess the value of a manualised cognitive behavioural intervention for distressing visual hallucinations by establishing if it reduces distress and disability. the aim is to determine the acceptability of the treatment package, feasibility of recruitment, the ability to deliver the treatment manual as intended, retention in the treatment, a preliminary estimate of effect size and maintenance of any gains at a brief follow up.

Eligibility criteria:
inclusion criteria: * meet entry criteria for early intervention in psychosis (eip) services * distressing visual hallucinations * age 18-38 years (the usual upper range of the eip services) exclusion criteria: * organic brain disease including dementia, epileptic psychosis, head injury (may be alternative cause of symptoms, or impair cognitive function and ability to do cbt) * primary diagnosis of drug or alcohol misuse (as above) * impaired intellect severe enough to interfere with ratings (as above) * in-patient/acute psychiatric care needed at baseline assessment (patients must be well enough to engage in out-patient cbt) * previous cbt for psychosis (those previously exposed to the cbt model may be more likely to respond to cbt)

Keywords: pilot study cbt trial