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Onset and duration of intradermal mixtures of bupivacaine and lidocaine with epinephrine.

ABSTRACT: BACKGROUND/OBJECTIVE:Bupivacaine and lidocaine are often used concurrently, in theory, to combine the more rapid onset of lidocaine and the longer duration of bupivacaine. The purpose of this study was to evaluate this concept. METHODS:Twenty-five subjects were enrolled in a double-blinded, randomized block design study to evaluate the onset and duration of four different mixtures of lidocaine and bupivacaine with epinephrine. The study was designed to achieve 80% power to detect an effect size of 0.37 at 5% overall significance. The four mixtures tested were: 0.25% bupivacaine with epinephrine (1:200,000); 1% lidocaine with epinephrine (1:100,000); 0.125% bupivacaine and 0.5% lidocaine with epinephrine (1:150,000); and 0.25% bupivacaine and 1% lidocaine with epinephrine (1:150,000). Four intradermal injections were made in the volar forearms of each participant. Time to effect and duration were measured by sensation of a sharp skin prick. RESULTS:Mean time to onset ranged from 12 s to 29 s without statistical significance across all tested solutions (P=0.891). Mean duration of effect ranged from 6 h 38 min to 7 h 25 min with a statistically significant difference across the tested solutions (P=0.036). CONCLUSIONS:No statistical benefit was measured when comparing lidocaine with epinephrine, bupivacaine with epinephrine, and mixtures of these local anesthetics with regard to onset of action. While a statistical difference was observed in duration of effect, the clinical benefit measured was narrow.

SUBMITTER: Collins JB

PROVIDER: S-EPMC3891109 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Onset and duration of intradermal mixtures of bupivacaine and lidocaine with epinephrine.

Collins James B JB Song Juhee J Mahabir Raman C RC

The Canadian journal of plastic surgery = Journal canadien de chirurgie plastique 20130101 1

<h4>Background/objective</h4>Bupivacaine and lidocaine are often used concurrently, in theory, to combine the more rapid onset of lidocaine and the longer duration of bupivacaine. The purpose of this study was to evaluate this concept.<h4>Methods</h4>Twenty-five subjects were enrolled in a double-blinded, randomized block design study to evaluate the onset and duration of four different mixtures of lidocaine and bupivacaine with epinephrine. The study was designed to achieve 80% power to detect ...[more]

PMID: 24431939

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Project description:BackgroundSome children feel pain during wound closures using tissue adhesives. We sought to determine whether a topically applied analgesic solution of lidocaine-epinephrine-tetracaine would decrease pain during tissue adhesive repair.MethodsWe conducted a randomized, placebo-controlled, blinded trial involving 221 children between the ages of 3 months and 17 years. Patients were enrolled between March 2011 and January 2012 when presenting to a tertiary-care pediatric emergency department with lacerations requiring closure with tissue adhesive. Patients received either lidocaine-epinephrine-tetracaine or placebo before undergoing wound closure. Our primary outcome was the pain rating of adhesive application according to the colour Visual Analogue Scale and the Faces Pain Scale--Revised. Our secondary outcomes were physician ratings of difficulty of wound closure and wound hemostasis, in addition to their prediction as to which treatment the patient had received.ResultsChildren who received the analgesic before wound closure reported less pain (median 0.5, interquartile range [IQR] 0.25-1.50) than those who received placebo (median 1.00, IQR 0.38-2.50) as rated using the colour Visual Analogue Scale (p=0.01) and Faces Pain Scale--Revised (median 0.00, IQR 0.00-2.00, for analgesic v. median 2.00, IQR 0.00-4.00, for placebo, p<0.01). Patients who received the analgesic were significantly more likely to report having or to appear to have a pain-free procedure (relative risk [RR] of pain 0.54, 95% confidence interval [CI] 0.37-0.80). Complete hemostasis of the wound was also more common among patients who received lidocaine-epinephrine-tetracaine than among those who received placebo (78.2% v. 59.3%, p=0.008).InterpretationTreating minor lacerations with lidocaine-epinephrine-tetracaine before wound closure with tissue adhesive reduced ratings of pain and increased the proportion of pain-free repairs among children aged 3 months to 17 years. This low-risk intervention may benefit children with lacerations requiring tissue adhesives instead of sutures.Trial registrationClinicalTrials.gov, no. PR 6138378804.

Dataset Information

Onset and duration of intradermal mixtures of bupivacaine and lidocaine with epinephrine.

Publications

Onset and duration of intradermal mixtures of bupivacaine and lidocaine with epinephrine.

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