A role of transcutaneous vagus nerve stimulation on left ventricular function and afterload in Takotsubo syndrome

INTERVENTION: In the active LLTS precedent group, a device clip is attached to the left tragus, and stimulation was performed for 1 hour as vagus nerve auricular stimulation. In the Sham stimulation precedent group, a clip was attached to the left earlobe, and stimulation was performed for 1 hour. After the Intervention 1, with resting for 1 hour, Sham stimulation is performed in the Active LLTS precedent group, and Active LLTS is performed in the Sham stimulation precedence group, and crossover is performed. CONDITION: Takotsubo syndrome PRIMARY OUTCOME: Changes in left ventricular global strain and afterload before and after tVNS INCLUSION CRITERIA: