The effect of low-frequency repetitive transcranial magnetic stimulation (rTMS) on the treatment of aphasia caused by cerebrovascular accident (CVA)

Background: Aphasia is a common outcome of Cerebrovascular Accident (CVA) in which clinical interventions have limited effectiveness. Some evidence suggests that noninvasive stimulation of the brain can have beneficial effects in the treatment of CVA induced aphasia. In patients with motor aphasia, repetitive Transcranial Magnetic Stimulation (rTMS) is used to facilitate long-term improvement in speech ability. Since identifying effective methods for treating CVA induced aphasia can be very important in subsequent decision-making and treatment interventions, the objective of this study was to evaluate the effect of low-frequency TMS in Broca’s area in the right hemisphere on the treatment of CVA induced motor aphasia. Methods: This clinical trial enrolled 24 patients with a clinical diagnosis of motor aphasia caused by CVA using convenient sampling. In this study, the effect of stimulation of Broca’s area in the right hemisphere was examined by low-frequency rTMS (one Hz) on aphasia caused by CVA. To conduct verbal fluency test in patients, their correct responses to the selected images before and after rTMS during a certain time were recorded and compared by non-parametric Wilcoxon test using SPSS16 and the significance level was considered <0.05. Registration ID of this research in IRCT is IRCT2014052417814N1. Results: The study findings suggested a significant difference between Wilcoxon test results of patients before and after rTMS (z= -4.401), and it was found that using low-frequency rTMS in the right hemisphere was effective on improving dysarthria in the study population with 95 percent confidence interval (p<0.001). Conclusion: According to the findings, low-frequency rTMS has the potential to be considered as a treatment for patients with nonfluent aphasia caused by CVA.