Differential posttraumatic stress disorder symptom cluster response to stellate ganglion block: secondary analysis of a randomized controlled trial.
Level 2 - randomized trial
Secondary analysis of an individual randomized controlled trial
PubMed 38811568 · doi:10.1038/s41398-024-02926-8
What was done
This was a secondary analysis of a randomized controlled trial evaluating stellate ganglion block (SGB, local anesthetic injection into the cervical sympathetic chain) versus sham injection (normal saline) in 113 active duty service members with posttraumatic stress disorder (PTSD). PTSD symptom clusters were assessed at baseline and 8 weeks post-procedure via clinical interview and self-report measures, analyzed using logistic regression and post-hoc item-level evaluations.
What was found
The arousal and reactivity symptom cluster demonstrated the greatest reduction in symptom severity after SGB relative to sham, primarily driven by reductions in hypervigilance, concentration difficulties, and sleep disturbance. The reexperiencing cluster also showed pronounced improvements on clinician-rated assessments (driven by decreases in physiological/emotional reactivity to cues and intrusions) but not on self-reported measures. The abstract reported no specific numerical values, odds ratios, or confidence intervals.
Why it matters
These findings suggest that sympathetic blockade with SGB primarily targets autonomic hyperarousal and physiological reactivity rather than uniformly affecting all PTSD symptom domains, helping clarify its potential mechanism and clinical utility in military populations.
Limits
As a secondary, post-hoc analysis, findings are hypothesis-generating. The study was restricted to active duty service members, limiting generalizability to civilian PTSD. Follow-up was limited to 8 weeks, the abstract lacks exact effect sizes, and results for the reexperiencing cluster were inconsistent between clinician ratings and self-reports.
Cited by
- supports Stellate ganglion blocks work by dampening sympathetic nervous system activity sufficiently to allow parasympathetic vagal activity to express itself, providing therapeutic utility for PTSD and trauma.