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The progression of heart failure with reduced ejection fraction is promoted by sympathovagal imbalance. Baroreflex activation therapy (BAT) by the electrical stimulation of baroreceptors at the carotid sinus significantly improved exercise capacity and NT-proBNP levels in a randomized trial; however, no significant difference in left ventricular ejection fraction (LV-EF) between groups was found. Here, we report the case of a 30-year-old man with a long history of dilated cardiomyopathy and severely reduced LV-EF despite optimal medical therapy, who was treated with BAT since October 2014 and showed a remarkable improvement in both symptoms and LV-EF under this treatment.