ABSTRACT
Objective To evaluate the efficacy of stellate ganglion block (SGB) with different do-ses of lidocaine. Methods Sixty patients of both sexes who required SGB, aged 18- 64 yr, with body height 150-178 cm, weighing 49-94 kg, of American Society of Anesthesiologists physical status Ⅰ orⅡ, were divided into 3 different doses of lidocaine groups (L1-3 groups, n= 20 each) using a random num-ber table. SGB was performed by injecting 1％ lidocaine 8, 6 and 4 ml in L1-3 groups, respectively. Blood flow velocity of carotid artery was recorded before SGB and at 10 min after SGB. Successful block was de-fined as the occurrence of Horner's syndrome after block and was recorded. Diffusion of the drug crossing the middle line of carotid artery after injection and adverse reactions (brachial plexus block, recurrent la-ryngeal nerve block, pneumothorax, hematoma, local anesthetic intoxication) were also recorded. Results SGB was successful in all the three groups. Compared with group L1 , the incidence of recurrent larynge-al nerve block and incidence of crossing the middle line of carotid artery were significantly decreased in L2 and L3 groups (P<0. 05). There was no significant difference in the incidence of recurrent laryngeal nerve block or incidence of crossing the middle line of carotid artery between group L2 and group L3 (P>0. 05). The blood flow velocity of carotid artery was significantly higher at 10 min after SGB than that before SGB (P<0. 05). There was no significant difference in the blood flow velocity of carotid artery between the three groups (P>0. 05). Conclusion SGB with 1％ lidocaine 4 ml produces better efficacy.