Electroconvulsive Therapy Alone for Schizophrenia: A Meta-analysis of Randomized, Single-blind, Controlled Trials [RETRACTED].

PURPOSE:Electroconvulsive therapy (ECT) is a common treatment in practice for schizophrenia in most developing countries. This is a meta-analysis of the efficacy and safety of ECT alone versus antipsychotic (AP) monotherapy for schizophrenia using randomized, single-blind, controlled trial (RCT) data. METHODS:Two assessors independently extracted data. Standardized and weighted mean difference (SMD/WMD), odds ratios (ORs) ± 95% confidence intervals (CIs), and number needed to harm (NNH) were calculated by Review Manager Version 5.3 and the Comprehensive Meta-Analysis Version 2 software. RESULTS:Five RCTs (n = 365; age, 34.1 ± 4.7 years; percentage of male, 52.8 ± 9.5; range on the Jaded scale, 2-3) were identified and analyzed. Electroconvulsive therapy alone was superior to AP monotherapy with chlorpromazine, haloperidol, paliperidone, clozapine, and risperidone, respectively, regarding symptomatic improvement at last-observation end point (SMD, -0.84; P = 0.02; I = 89%). Improvement with ECT separated from AP as early as weeks 1 to 2 (SMD, -1.26; P = 0.01; I = 89%). Meta-analysis of the end point memory quotient of the Wechsler Memory Scale-Revised, Chinese version, revealed that the ECT alone group had poorer memory performance than the AP group (WMD, -9.34; P < 0.00001; I = 0%), but the difference lost its significance within 2 weeks after ECT (WMD, 0.09 to -6.54; P = 0.11-0.97; I = 0%). Compared with AP monotherapy, ECT was associated with more memory impairment (OR, 14.11; P = 0.004; NNH, 6) but with less akathisia (OR, 0.06; P = 0.0009; NNH, 6), tremor (OR, 0.08; P = 0.02; NNH, 7), and tachycardia (OR, 0.06; P = 0.006; NNH, 5). There were no significant differences in other adverse events and all-cause discontinuation. CONCLUSIONS:Electroconvulsive therapy alone could be an effective and safe treatment option for schizophrenia, with transient memory impairment and headache being the major side effects.