Changes in microcirculation and metabolic activity in soft tissue after local injection of hyaluronic acid in different modes in experimental explosive injury

Abstract

Objective: To identify changes in microcirculation and metabolic activity in soft tissues in an experimental explosive wound after local administration of hyaluronic acid and to determine the mode of its use, in which these changes are sanogenetically significant.Methods: The experiments were approved by the local Ethics Committee and performed on 96 male Wistar rats weighing 300-350 g. at the age from 4 to 4.5 months. The design of the study included the following stages: wound modeling (according to the method which has RF patent for invention No. 2741238); closing the wound with a pressure bandage and fixing it with a patch; primary surgical treatment of the wound 3 hours after the injury; fan (5-6 points) intramuscular injection of hyaluronic acid (“Hyalift” medication) diluted with 0.9% sodium chloride solution to 1.75% (total volume – 0.5-0.8 ml); dynamic observation accompanied by daily wound dressings (chlorhexidine, and Levomekol ointment) until its epithelialization and by intramuscular administration of antibacterial drug (Gentamicin sulfate) during the first 7 days after the injury. The study of microcirculation and metabolism of tissues of the injury zone using laser Doppler flowmetry, optical tissue oximetry and laser fluorescence diagnostics (using the device "Lakk-M") was conducted on the 7th, 14th and 28th day after the injury.Results: Early (3 hours after the injury) local application of HA in case of an explosive soft tissue wound improves the perfusion characteristics of microcirculation, has a positive effect on the trophism and oxidative metabolism of skeletal muscles, and reduces the time of wound healing. The early administration (3 hours after the injury) of HA in the mode: locally in the para volar tissues, after 3 hours (at the end of the primary surgical treatment of the wound) and additionally after 24 hours after the injury is considered to be the most effective.Conclusions: Intramuscular injection of hyaluronic acid into the para volar tissues in the first hours after the wound in case of an explosive soft tissue wound is a sanogenetically justified method of correcting the wound process.