Continuous Intravenous Lidocaine Infusion for the Management of Pain Uncontrolled by Opioid Medications.

Limited data exist describing the outcomes of patients receiving continuous lidocaine infusions. The objective of this study was to evaluate the effect of use of continuous lidocaine infusions for pain management at a community teaching hospital. A retrospective chart review was performed that included adult patients receiving continuous systemic lidocaine infusions for the treatment of pain. Twenty-one patients were included in the analysis. Dosing ranged from 0.25 to 2.8 mg/kg/h, with a median infusion time of 64 hours. Eight patients (38%) experienced a response (≥20% reduction in pain score during the infusion compared with prior to the infusion). Among responding patients, there was a decrease in pain scores at rest after starting lidocaine (compared with prior to lidocaine) (6.5 vs. 3.7, P = .001) that was maintained 24 hours after lidocaine discontinuation. There were no differences in pain scores before, during, or after lidocaine in the entire study sample. A difference in oral morphine equivalent intake was present comparing usage during the infusion vs. day +1 (P = .006) and day +2 (P < .001). Similarly, a difference was present comparing morphine equivalent usage on day -2 with day +2 (P = .008) and day -1 with day +1 (P = .006). Continuous infusions of systemic lidocaine appear to be beneficial in some patients experiencing uncontrolled pain and may improve pain scores while decreasing opioid requirements. Overall beneficial effects of systemic lidocaine may last longer than the infusion itself.