Figure 4A: A flat needle angle will be used to traverse under the clavicle (C). 4B: The bock needle will have to pass under the clavicle and will not be visualized. Note the needle tip as it emerges from under the clavicle and can be easily seen because of its flat angle. 4C: The block needle is advanced until placed just under the axillary artery (Ax). 4D: Anechoic anesthetic fluid is injected under the axillary artery (Ax) for a successful block.
Figure 4A: A flat needle angle will be used to traverse under the clavicle (C). 4B: The bock needle will have to pass under the clavicle and will not be visualized. Note the needle tip as it emerges from under the clavicle and can be easily seen because of its flat angle. 4C: The block needle is advanced until placed just under the axillary artery (Ax). 4D: Anechoic anesthetic fluid is injected under the axillary artery (Ax) for a successful block.
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