BACKGROUND: This study was performed to find the optimal volume of local anesthetics needed for a successful ultrasound-guided stellate ganglion block (SGB) to treat head and neck pathology. METHODS: Fifteen female and fourteen male @entity1274 @entity1 received 4 times SGBs with 0.2% @entity1342 in volumes of 6, 4, 3 and 2 ml at 1 to 3 day intervals. Using the transverse short-axis view of the neck that showed Chassaignac's tubercle at the C6 level, a 25-gauge, and 4 cm needle was inserted via the lateral paracarotid approach with out-of-plane targeting between the prevertebral fascia and the ventral surface of longus colli muscle (subfascial injection). A successful block was confirmed with the onset of @entity1736 ( @entity4820 ). RESULTS: There were no significant statistical differences between the presence of @entity4820 and the volume of local anesthetics given. However, @entity4820 was present in all trials for the 4 ml and 6 ml groups. Six (20.7%) and three out (10.4%) of twenty-nine trials in the 2 ml and 3 ml groups, respectively, failed to elicit @entity4820 . The duration of action was significantly different in the 2 ml group compared to that of the 6 ml group, but there was no significant difference between the other groups, including the 4 ml vs. 6 ml groups. The side effects were not different between the groups. CONCLUSIONS: This data suggests that the optimal volume of 0.2% @entity1342 for ultrasound-guided SGB to treat the head and neck pathology in daily practice is 4 ml.

The optimal volume of 0.2% XXXX required for an ultrasound-guided stellate ganglion block.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity1342 :: ('MESH:C037663', 'Chemical') :: ['ropivacaine'] @entity1274 :: ('MESH:D006319', 'Disease') :: ['sensory-neural hearing loss'] @entity1736 :: ('MESH:D001763', 'Disease') :: ['ptosis'] @entity4820 :: ('MESH:D006732', 'Disease') :: ["Horner's syndrome"]
@entity1342 :: (MESH:C037663,Chemical) :: ['ropivacaine']
