Efficacy, Safety and Neural Mechanism of Stellate Ganglion Block in the Treatment of Anxiety. Disorder.

1. In this study, ultrasound-guided Stellate Ganglion Block(SGB) will be used in the treatment of anxiety disorders, combined with relevant scales, HRV indicators and resting state functional magnetic resonance data, to explore the safety and effectiveness of SGB in the treatment of anxiety disorders, and to explore whether its mechanism of action is related to the excitability of sympathetic nervous system and the activity changes of insular cortex. 2. Verify the following hypothesis: (1) SGB is a safe, well-tolerated and acceptable treatment technique; (2) After SGB treatment, the anxiety symptoms of the patients were relieved to a certain extent and the psychological function was restored; (3) The sympathetic excitability of patients after SGB treatment is reduced, and this effect can be monitored by heart rate variability; (4) The activity of insular cortex decreased after SGB treatment.