title: The use of 5% lidocaine for prolonged analgesia in chronic pain patients: a new technique.
abstract: OBJECTIVE
  It has been found that 5% lidocaine with 7.5% dextrose causes irreversible conduction block in animal studies. Our case report subjects allowed us to observe the efficacy of 5% lidocaine for a prolonged analgesia in vivo.
  
  
  METHODS
  After performing a diagnostic nerve block with 1% lidocaine, 5% lidocaine with 7.5% dextrose was injected into three patients with trigeminal neuralgia, post-herpetic occipital neuralgia, and intercostal neuralgia, respectively. The patients were followed for one and a half years. Visual Analog Scale (VAS) scores and the side effects were recorded for each patient.
  
  
  RESULTS
  One patient received a trigeminal block and one patient received an occipital nerve block. Both patients reported immediate and complete pain relief lasting 14 and 8 months, respectively. One patient, given an intercostal nerve block, received immediate pain relief lasting 5 weeks. None of these patients exhibited any appreciable side effects or complications.
  
  
  CONCLUSIONS
  Our observations suggest that 5% lidocaine may be used safely and effectively for the purpose of prolonged analgesia in selected patients with intractable chronic pain syndromes.
authors.affiliation: Department of Anesthesia, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, New Jersey 08901, USA.
authors.forename: Y K
authors.initials: YK
authors.lastname: Choi
authors.forename: J
authors.initials: J
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D000779:Anesthetics, Local / Q000627:therapeutic use*; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008012:Lidocaine / Q000627:therapeutic use*; D008297:Male; D010146:Pain / Q000188:drug therapy*
chemical_list: D000779:Anesthetics, Local; D008012:Lidocaine