创伤弹道的诱发肌电变化

Changes of Evoked Muscle Action Potentials in Gunshot Wounds

用高速小质量钢珠射击10只雄性成年狗单后肢,在伤后1、3、6、8h分别测定距永久伤道0.5、1.5、3、4cm区的诱发肌动作电位(EMAP),同时切取组织作电镜检查,伤后8h进行清创和大体观察。实验结果表明:1、高速小质量钢珠弹伤的诱发肌电变化与超微结构变化相一致;2、距伤道0.5cm区持续显著地诱发肌电振幅、时程减小值可作为判定火器伤坏死组织界限的一项客观指标;3、随着时间增长,震荡区内、外层的损伤是可逆的。

Evoked muscle action potentials(EMAP) of skeletal muscle by a small shpe-rical steel bullet hit with high velocity are recorded in 10 mongrel dogs.After wounding the EMAP are measured at the distances of 0.5,1.5,3,4,cm from the edge of the permanent wound cavity in longitudinal direction at 1,3,6,8 h respectively.Simultaneously,tissue samples are taken for electron microscopic observation.Debridement and gross examination are carried out 8 h after wounding.The results indicate: 1.the changes of EMAP in gunshot wounds cause by high velocity bullet coincide with the ultrastructural alterations;2.at 0.5cm from the wound tract the low and sustained amplitude and duration values of EMAP may -be taken as an objective evidence to distinguish devitalized from living tissues;3.the injury at inner and outer layer of concussion zone is reversible.