Abstract | BACKGROUND: The time until maximal cutaneous vasoconstriction after injection of lidocaine with epinephrine is often given in textbooks and multiple choice examinations as 7 to 10 minutes. However, in our experience, there is significantly less cutaneous bleeding if one waits considerably longer than 7 to 10 minutes after injection of local anesthesia with epinephrine for most procedures on human skin. METHODS: This was a prospective, randomized, triple-blind study where 12 volunteers were injected simultaneously in each arm with either 1% lidocaine with epinephrine (study group) or 1% plain lidocaine (control group), after which the relative hemoglobin concentration of the underlying skin and soft tissues was measured over time using spectroscopy. RESULTS: In the epinephrine group, the mean time at which the lowest cutaneous hemoglobin level was obtained was 25.9 minutes (95 percent CI, 25.9 ± 5.1 minutes). This was significantly longer than the historical literature values of 7 to 10 minutes for maximum vasoconstriction after injection. Mean hemoglobin index values at every time measurement after postinjection minute 1 were significantly different between the study group and the control group, with use of a two-tailed paired t test (p < 0.01). CONCLUSIONS: If optimal visualization is desired, the ideal time for the surgeon to begin the incision should be 25 minutes after injection of local anesthetic with epinephrine. It takes considerably longer than 7 to 10 minutes for a new local equilibrium to be obtained in relation to hemoglobin quantity.
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Authors | Daniel E McKee, Donald H Lalonde, Achilleas Thoma, Diana L Glennie, Joseph E Hayward |
Journal | Plastic and reconstructive surgery
(Plast Reconstr Surg)
Vol. 131
Issue 4
Pg. 811-814
(Apr 2013)
ISSN: 1529-4242 [Electronic] United States |
PMID | 23249984
(Publication Type: Journal Article, Randomized Controlled Trial)
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Chemical References |
- Vasoconstrictor Agents
- Epinephrine
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Topics |
- Adult
- Blood Loss, Surgical
(prevention & control)
- Double-Blind Method
- Epinephrine
(administration & dosage)
- Female
- Humans
- Injections
- Male
- Prospective Studies
- Time Factors
- Vasoconstrictor Agents
(administration & dosage)
- Young Adult
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