Arm adduction does not increase block extension in anesthesia of the brachial plexus by the axillary approach
1998
INTRODUCTION: Arm abduction of 90 degrees during injection of local anesthetic followed by adduction of the arm has been recommended traditionally to favor proximal distribution of local anesthetic and extension of the blockade in the brachial plexus by the axillary route. A recent study demonstrated that there are no clinical or radiological differences between axillary blockades performed with abduction or adduction. OBJECTIVE: To compare the extension of sensory blockade in axillary anesthesia performed with adduction or abduction. MATERIAL AND METHODS: Forty patients were randomly distributed in two groups, 20 in the adduction group and 20 in the abduction group. The axillary catheter was inserted 3 cm in the proximal direction and a mixture of 40 ml of 1.5% mepivacaine without adrenaline and 4 ml of 8.4% bicarbonate soda was injected into each patient. RESULTS: No statistically significant differences in extension of sensory blockade, including circumflex, musculocutaneous and radial nerve blockade, were observed. CONCLUSIONS: Axillary rotation of the arm is not a determining factor in sensory blockade in brachial plexus anesthesia by the axillary route.
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