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The aim of the present single-blind randomized-controlled therapy study is to assess the efficacy of a new form of Cognitive Behavioral Therapy for delusions with a focus on emotion regulation, improvement of self-esteem and sleep quality (CBTd-E).
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Numerous meta-analyses have found Cognitive Behaviour Therapy for psychosis (CBTp) to be effective. The effect sizes that are achieved for positive symptoms in addition to antipsychotic treatment vary between small to medium. However, the effect sizes for changes in delusions are somewhat lower. Thus, it could prove beneficial to tailor CBTp interventions more precisely to the processes that are relevant to delusions. Empirically derived models of the formation and maintenance of delusions postulate an important role of cognitive biases, emotional factors and self-esteem. Additional studies have demonstrated the relevance of impaired sleep to delusions. Nevertheless, CBTp interventions that aim to change delusions tend to focus mainly on reasoning bias.
The results of several uncontrolled pilot studies that focused primarily at improving emotional factors, quality of sleep and self-esteem in patients with delusions indicate that changes in these factors have the potential to reduce delusions. However, in these studies the singular interventions were short and were not implemented into a broader therapy rational. It can thus be assumed that a combination of CBT-interventions within a broader therapy rational might have an even greater impact on delusions.
The aim of the present single-blind randomized-controlled therapy study is to assess the efficacy of a new form of Cognitive Behavioral Therapy for delusions with a focus on emotion regulation, improvement of self-esteem and sleep quality (CBTd-E) that will be applied in 25 individual sessions. Moreover, the study aims to test whether the efficacy of CBTd-E is mediated by the postulated processes. The main hypotheses are:
In addition to questionnaires and interviews, behavioral paradigms, psychophysiological assessments and electronic diaries will be used to test the hypotheses. If we can demonstrate that CBTd-E reduces delusions, this would provide us with a more acceptable and feasible therapy for treating delusions.
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94 participants in 2 patient groups, including a placebo group
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