title: A randomized comparison of ropivacaine 0.1% and 0.2% for continuous interscalene block after shoulder surgery.
abstract: BACKGROUND
  The optimal concentration of ropivacaine for continuous interscalene block after shoulder surgery is currently unknown.
  
  
  METHODS
  Fifty-six patients received a perineural infusion of either ropivacaine 0.1% or 0.2% for 48 hours after shoulder surgery. We assessed pain scores as primary end points and supplemental analgesia, ropivacaine consumption, motor block, side effects, and patient satisfaction as secondary end points.
  
  
  RESULTS
  Pain scores were not statistically different during the infusion periods; however, supplemental analgesia consumption was higher in the group receiving ropivacaine 0.1% during the first 24 hours (64% vs 28%, P = 0.022). Other secondary end points were statistically inconclusive.
  
  
  CONCLUSIONS
  These results suggest that ropivacaine 0.2% provides more effective analgesia than ropivacaine 0.1% during the first 24 hours for continuous interscalene block after shoulder surgery.
authors: Department of Anesthesiology and Pain Medicine, Cheju Halla General Hospital, Doreongno 65, Jeju-si, Jeju, South Korea. everycw@daum.net
authors: Chun Woo
authors: CW
authors: Yang
authors: Sung Mee
authors: SM
authors: Jung
authors: Po Soon
authors: PS
authors: Kang
authors: Hee Uk
authors: HU
authors: Kwon
authors: Choon Kyu
authors: CK
authors: Cho
authors: Younsuk
authors: Y
authors: Lee
authors: Chul Woung
authors: CW
authors: Kim
authors: Su Young
authors: SY
authors: Kim
mesh_terms: D000368:Aged; D000577:Amides / Q000008:administration & dosage* / Q000737:chemistry; D000779:Anesthetics, Local / Q000008:administration & dosage; D002626:Chemistry, Pharmaceutical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009407:Nerve Block / Q000379:methods*; D019637:Orthopedic Procedures / Q000009:adverse effects / Q000379:methods; D010147:Pain Measurement / Q000187:drug effects* / Q000379:methods; D010149:Postoperative Pain / Q000473:pathology / Q000517:prevention & control*; D000077212:Ropivacaine; D012782:Shoulder / Q000473:pathology / Q000601:surgery*
chemical_list: D000577:Amides; D000779:Anesthetics, Local; D000077212:Ropivacaine