Comparison of the onset of anesthesia induced by two different concentrations and volume of lidocaine in regional intravenous anesthesia of the upper extremity

Intravenous regional anesthesia is a technique developed by the use of tourniquet and intravenous injection of anesthetic drug in the distal areas of the surgical region of the limbs. The aim of this study was to compare the onset of anesthesia induced by two methods of lidocaine use in regional intravenous anesthesia of the upper extremity.

This single-blind clinical trial study was performed on 40 patients who referred to Bohlool hospital in Gonabad for forearm surgery. Samples were randomly divided into two receiving 40 ml lidocaine 0.5% and 20 ml lidocaine 1%. The research tool was a Researcher-made checklist and a Visual Analoge Scale (VAS). Fisher's exact test, independent and pair t-test were used for data analysis at a significance level of less than 0.05.

The results showed that the interval between the injection of anesthesia until the start of complete anesthesia was significantly shorter in the 20 ml lidocaine 1% recipient group compared to the 40 ml lidocaine 0.5% recipient group (p0.05).

Regional intravenous anesthesia is induced by 20 ml lidocaine 1% faster than 40 ml lidocaine 0.5%.Keywords: Lidocaine, Intravenous, Regional anesthesia, Upper extremity