Objective: The purposes of this study were to measure the effect of Stellate ganglion block(SGB) objectively and quantitatively by the use of sympathetic skin response(SSR), and to evaluate the cumulative effects and complications of repetitive SGB and to find out optimal numbers of injection per one cycle in the patients with reflex sympathetic dystrophy(RSD).
Method: Six patients with RSD were evaluated with a SSR test before and after the injection of 1% lidocaine 4 ml by SGB method.
Results: There was a significant prolongation of latencies in SSR of the lesion side of sixty mixed cases by the SGB methods and SSR tests. There were no significant changes in the latency and amplitude of SSR from the lesion side between pre- and post injection states. There was a significant decrease of amplitude in the sound side after the injection. The differences of the amplitudes between pre- and post injections were significantly higher in the lesion side than the sound side. The degree of pain of the patients with RSD was evaluated by visual analogue scale(VAS), which scored on pre and post injection state decreased from 10 to 6.5 by 5 times injections, but did not decrease by more injections.
Conclusion: We concluded that SGB is more effective in the RSD lesion side than the sound side and the SSR is a useful test for evaluating the effect of SGB.
