The study will include patients with drug-refractory arrhythmic storm indicated for left ganglion stellate block (LGSB) before or after catheter ablation.~Included participants will be dived based on the need for mechanical ventilation and catheter ablation performed <5 days before the study~Subsequently, the participants will be randomized to LGSB or to a sham (placebo) procedure.~The primary endpoint will be a reduction of the burden of clinical arrhythmia >50% 24 hours after LGSB without escalation of antiarrhythmic therapy.~The study will include 80 patients over 4 years.
This study will evaluate the acute effect of ultrasound-navigated left ganglion stellate block to suppress ventricular arrhythmia in patients with arrhythmic storm.