title: Comparative analysis of effectiveness of two local anesthetic techniques in men undergoing no-scalpel vasectomy.
abstract: OBJECTIVE
  To compare the effectiveness of two local anesthetic techniques in men undergoing no-scalpel vasectomy.
  
  
  METHODS
  Before undergoing no-scalpel vasectomy, 50 men underwent separate forms of anesthesia to each side of their scrotum. One vas deferens was anesthetized with a high-pressure spray of 0.3 mL 2% lidocaine using the MadaJet Medical Injector, and the other vas deferens was anesthetized using the traditional vasal block performed with three 1.7-mL ampules of mepivacaine using a 27-gauge needle. The pain of the initial delivery of anesthesia and the pain with the subsequent vasectomy were recorded.
  
  
  RESULTS
  Fifty men underwent no-scalpel vasectomy with a different anesthetic delivery system to each vas deferens separately. A statistically significant reduction was noted in the visual analog pain scores in favor of no-needle administration of anesthesia, 1.56 of 10 versus 2.12 of 10 (P <0.029). A reduction was noted in the visual analog pain score for the subsequent vasectomy after administration of anesthesia using the no-needle method, but this was not statistically significant (1.68 of 10 versus 1.86 of 10; P <0.66).
  
  
  CONCLUSIONS
  No-needle anesthesia with jet injection reduced the pain associated with traditional delivery of anesthesia to the skin and vas deferens before no-scalpel vasectomy. Additional studies are needed with more subjects to evaluate whether the decrease in procedural pain is statistically significant when comparing the two types of anesthetics.
authors.affiliation: Michigan State University College of Osteopathic Medicine Urologic Consortium, Grand Rapids, Michigan, USA.
authors.forename: Michael A
authors.initials: MA
authors.lastname: White
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Maatman
mesh_terms: D000328:Adult; D000779:Anesthetics, Local / Q000008:administration & dosage*; D006801:Humans; D007277:Injections, Jet; D008012:Lidocaine / Q000008:administration & dosage; D008297:Male; D008619:Mepivacaine / Q000008:administration & dosage; D008875:Middle Aged; D010147:Pain Measurement; D014649:Vas Deferens; D014659:Vasectomy / Q000379:methods
chemical_list: D000779:Anesthetics, Local; D008012:Lidocaine; D008619:Mepivacaine