The Effect of Injection Speed on the Pain of Lidocaine Infiltration |
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Authors: | Richard S. Krause MD Ronald Moscati MD Michael Filice BS E. Brooke Lerner BA David Hughes BS |
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Affiliation: | State University of New York at Buffalo School of Medicine and Biomedical Sciences, Buffalo, NY, Department of Emergency Medicine |
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Abstract: | Objective : To determine whether reducing the speed of injection is effective in reducing injection pain for buffered and unbuffered lidocaine solutions. Methods : A prospective, single-blind, randomized, crossover, laboratory study was performed. Adult volunteers were recruited from ED staff at an urban teaching hospital to serve as subjects. Twenty-nine subjects each received 4 1-mL injections into the dorsum of the hands. Each subject received fast and slow injections of buffered and unbuffered lidocaine. Subjects rated the pain of each injection on a 100-mm visual analog scale (VAS). Mean pain scores for each intervention were compared using analysis of variance. Results : The mean pain VAS score for fast injection of buffered lidocaine was 14.1 mm. For slow buffered injection, the mean pain score was 11.4 mm (p = 0.98). For unbuffered lidocaine, the means were 28.7 mm for fast injection and 22.2 mm for slow injection (p = 0.40). Conclusions : Reducing injection speed did not produce a statistically significant change in injection pain for either buffered or unbuffered solutions. |
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Keywords: | lidocaine local anesthetic pain injection |
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