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Negative symptoms in schizophrenia remain a clinical challenge with small effect sizes and evidence for pharmacological or psychotherapeutic treatment approaches. Studies suggest that electroconvulsive therapy (ECT) holds some promise as a treatment option of often persistent negative symptoms with clinically meaningful effects. This review summarizes the existing evidence on the efficacy of ECT on negative symptoms in patients with schizophrenia. Thirty-five publications were included in this literature review comprising 21 studies, two meta-analyses, eight reviews and four case reports. Conclusions should be interpreted cautiously, given the small number and methodological shortcomings of the included publications with a variation of study designs and missing standardized protocols. Implications for future research and practice are critically discussed. Recommendations are given to provide more evidence that will meet the clinical challenge of reducing the negative symptoms in schizophrenia. Study designs that focus explicitly on negative symptoms and assess patients over longer follow up periods could be helpful. Future research should include control groups, and possibly establish international multicentered studies to get a sufficient study population. Findings suggest that patients with schizophrenia resistant to pharmacological treatment might benefit from ECT. A risk and benefit assessment speaks in favour of the ECT treatment. Future practice of ECT should include a combination treatment with antipsychotics. Whereas the use of anaesthetics and electrode placement does not seem to play a role, the recommendation regarding frequency of ECT treatments is currently three times a week, For the assessment of negative symptoms the assessment tool should be chosen carefully.

Electroconvulsive therapy for negative symptoms in schizophrenia: a literature review from 2000 to 2021