title: Postoperative analgesic efficacy of different volumes and masses of ropivacaine in posterior brachial plexus block.
abstract: OBJECTIVE
  The efficacy of posterior brachial plexus block for shoulder surgeries is demonstrated by different authors. However, there is no consensus on the ideal mass and volume of local anesthetic to be employed. The objetive of this study was to compare different volumes and masses of ropivacaine in posterior brachial plexus block in arthroscopic surgeries of the shoulder.
  
  
  METHODS
  Sixty patients > 18 years, physical status ASA I and II, scheduled for unilateral arthroscopic surgeries of the shoulder were randomly placed in three groups: A (10 mL to 0.5%), B (20 mL to 0.5%), C (5 mL to 1%). The block was performed with a 22G needle of 100 mm connected to neurostimulator, in a point 3 cm lateral to the midpoint of C6 and C7 interspace, being injected the solution corresponding to each group. The postoperative pain was evaluated at the recovery room and within the first 24 hours of the postoperative period. The groups were compared on length of time until the first complaint of pain, visual numeric scale (VNS) score and morphine consumption within the first 24 hours.
  
  
  RESULTS
  There was no statistically significant difference between the three groups related to age, weight and height. There was no difference in length of time until the first complaint of pain, VNS scores over three and morphine consumption in the postoperative period between the groups.
  
  
  CONCLUSIONS
  This study concluded that 5 mL of 1% ropivacaine promoted analgesic efficacy similar to 10 mL or 20 mL of 0.5% ropivacaine in the posterior brachial plexus block using neurostimulator.
authors.affiliation: Lifecenter Hospital, Brazil. brunomoraisanest@yahoo.com.br
authors.forename: Bruno Salome
authors.initials: BS
authors.lastname: de Morais
authors.forename: Marcos Guilherme Cunha
authors.initials: MG
authors.lastname: Cruvinel
authors.forename: Fabiano Soares
authors.initials: FS
authors.lastname: Carneiro
authors.forename: Flavio
authors.initials: F
authors.lastname: Lago
authors.forename: Yerkes Pereira
authors.initials: YP
authors.lastname: Silva
mesh_terms: D000577:Amides / Q000008:administration & dosage*; D000779:Anesthetics, Local / Q000008:administration & dosage*; D001182:Arthroscopy; D001917:Brachial Plexus; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009407:Nerve Block / Q000379:methods; D010149:Postoperative Pain / Q000517:prevention & control*; D000077212:Ropivacaine; D012785:Shoulder Joint / Q000601:surgery*
chemical_list: D000577:Amides; D000779:Anesthetics, Local; D000077212:Ropivacaine