title: The analgesic effect of a metered-dose 8% lidocaine pump spray in posttraumatic peripheral neuropathy: a pilot study.
abstract: BACKGROUND
  A topical lidocaine patch is effective in the treatment of posttraumatic peripheral neuropathy (PTPN), but it is not suited for breakthrough pain because of difficulty with an additional application. Here, we examined the effect of 8% lidocaine pump spray (Xylocaine pump spray, XPS) on peripheral neuropathic pain caused by surgery or injury.
  
  
  METHODS
  Thirty-one patients with PTPN were randomized to receive either XPS or saline placebo pump spray applied to painful skin areas. The optimal dose of up to 30 sprays (0.1 mL/single spray, 30 times) was individually determined as the dose which completely covered the painful site. After a 7-day period, the patients were crossed over to receive the optimal dose of the alternative spray. Pain was assessed with a visual analog scale.
  
  
  RESULTS
  XPS, but not placebo pump spray, significantly decreased the visual analog scale for continuing pain and tactile allodynia. The effect persisted for a median of 5 h (range, 2-60 h) after application. Mild side effects were reported in three patients with XPS consisting of local irritation (n = 3) and local flare (n = 1). All adverse events disappeared without medication within a few hours.
  
  
  CONCLUSIONS
  The present study suggests that XPS provides a significant improvement in PTPN due to its prompt analgesia, lack of systemic side effects and convenience.
authors.affiliation: Department of Anesthesiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara 228-8555, Japan. kanaiakifumi@aol.com
authors.forename: Akifumi
authors.initials: A
authors.lastname: Kanai
authors.forename: Yuka
authors.initials: Y
authors.lastname: Segawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Okamoto
authors.forename: Masanori
authors.initials: M
authors.lastname: Koto
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Okamoto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000779:Anesthetics, Local / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008012:Lidocaine / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use*; D008297:Male; D036501:Metered Dose Inhalers; D008875:Middle Aged; D010146:Pain / Q000188:drug therapy* / Q000209:etiology*; D010147:Pain Measurement; D010523:Peripheral Nervous System Diseases / Q000188:drug therapy* / Q000209:etiology*; D010865:Pilot Projects; D014947:Wounds and Injuries / Q000150:complications*; D055815:Young Adult
chemical_list: D000779:Anesthetics, Local; D008012:Lidocaine