Delayed small bowel injury as a result of penetrating extraperitoneal high-velocity ballistic trauma to the abdomen

Intra-abdominal injury from extra-peritoneal ballistic trauma

Over the last century sporadic reports have described intra-abdominal injury without penetration of the abdominal cavity but the underlying mechanism of energy transfer appears variable. This article reviews the 19 documented cases of this phenomenon and discusses the mechanism of energy transfer in both primary blast injury and ballistic injury that may be responsible.

A thoracic mechanism of mild traumatic brain injury due to blast pressure waves

The mechanisms by which blast pressure waves cause mild-to-moderate traumatic brain injury (mTBI) are an open question. Possibilities include acceleration of the head, direct passage of the blast wave via the cranium, and propagation of the blast wave to the brain via a thoracic mechanism. The hypothesis that the blast pressure wave reaches the brain via a thoracic mechanism is considered in light of ballistic and blast pressure wave research. Ballistic pressure waves, caused by penetrating ballistic projectiles or ballistic impacts to body armor, can only reach the brain via an internal mechanism and have been shown to cause cerebral effects. Similar effects have been documented when a blast pressure wave has been applied to the whole body or focused on the thorax in animal models. While vagotomy reduces apnea and bradycardia due to ballistic or blast pressure waves, it does not eliminate neural damage in the brain, suggesting that the pressure wave directly affects the brain cells via a thoracic mechanism. An experiment is proposed which isolates the thoracic mechanism from cranial mechanisms of mTBI due to blast wave exposure. Results have implications for evaluating risk of mTBI due to blast exposure and for developing effective protection.

Blast-Induced Colon Perforation Secondary to Civilian Gunshot Wound

Gunshot injuries sustained from rifle bullets in general are associated with more severe tissue destruction than similar injuries due to handgun bullets. This includes damage not directly attributable to the missile itself, in other words, that due to cavitation. We describe herein a colonic injury following a 0.223 caliber rifle bullet injury presumably due solely to blast effect.

Injuries to the colon from blast effect of penetrating extra-peritoneal thoraco-abdominal trauma

Although rare, blast injury to the intestine can result from penetrating thoraco-abdominal extra-peritoneal gunshot (and shotgun) wounds despite the absence of injury to the diaphragm or to the peritoneum. Injuries of the spleen, small intestine and the mesentery by this mechanism have been previously reported in the world literature. This paper reports the first two cases of non-penetrating ballistic trauma to the colon.