RESUMO
Objective: A complementary treatment for managing chemotherapy-induced nausea and vomiting (CINV) with promising results is electrostimulation of Pericardium 6 (PC 6; Neiguan). This review was conducted to evaluate the effects of electrostimulation therapy at PC 6 to control CINV in patients with cancer. The review was registered on PROSPERO (CRD42018087753). Methods: This systematic review and meta-analysis of clinical trials was accomplished according to the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. Studies written in English, Portuguese, or Spanish that met the eligibility criteria organized according to the PICO [Patient, Problem or Population; Intervention; Comparison, Control, or comparator; Outcome(s)] anagram were included. Descriptors used to search the databases were identified and selected according to the Medical Subject Headings of the National Library of Medicine. The primary outcomes evaluated were the frequency and severity of nausea, vomiting, and general emesis after the experimental protocol. The secondary outcomes evaluated were the numbers of antiemetic pills taken and the patients' quality of life. Results: Fourteen articles were included. There was a reduction in the mean number of episodes of acute nausea (mean difference [MD] = -2.08; 95% confidence interval [95%CI] = -2.76, -1.39) and acute vomiting (MD = -0.91; 95% CI = -1.39, -0.42) or delayed (MD = -0.85; 95%CI = -1.47, -0.23) in patients given the treatment. The other analyses of nausea, vomiting and emesis showed no differences. Conclusions: Electrostimulation at PC6 has an effect on controlling general emesis, and acute nausea and vomiting in different phases of recovery from chemotherapy in patients with cancer.