Abstract: Objective To compare the effects of different dose volume of 0.25%
evobupivacaine hydrochloride on nerve branches of axillary brachial plexus block under
ultrasound-guidedinchildren.Methods Atotalof120 ASA Ⅰ or Ⅱ childrenscheduledfor
surgeryofthehandorforearm wererandomlydividedinto4groups ( Groups0.35mL /
kg
,
0.30
mL /
kg
,
0.25mL /
kg
,
0.20mL /
kg
) .Midazolam wasadministered30minbeforetheoperating ,
propofolwasgivenbytarget-controlledinfusion ( TCI ) startedatentering , whenthepatientslost
consciousnesandhadnoreactiontoverbalinstructions.Axillaryroadblockbrachialplexuswas
done.0.35mL /
kg
, 0.30mL /
kg
, 0.25mL /
kg
, 0.20mL / kgoflocalanestheticswereequally
injected adjacent to radial nerve , median nerve , ulnar nerve , musculocutaneous nerve
respectively.Nerveblockeffect , duration , generalanesthesiadrugsdosageofeachgroupwere
observated , which wasusedtoevaluateperioperativeanesthesiaresults.Results Therewas
significantlydifferenceinefficancyofnerveblockinginfourgroups ( P <0.05 ) .Thecaseswhich
neededketamineingroup0.20mL / kgweremorethanthatinothergroups.Comparedtogroup
0.35mL /
kg
, 0.30 mL / kgand0.25 mL /
kg
, group0.20 mL / kgshoweda worseanalgesia 
afficancyandshort-timetolerance ( P <0.05 ) .Conclusion Itprovidedanactiveamplifierbyusing
thevolumefrom 0.25 mL / kgto0.35 mL / kgofbupivacaineforultrasound-guidedaxillary
approachbrachialplexusblockinupperlimbssurgeryinchildren.

Key words: nerveconductionblock , brachialplexus , bupivacaine