Delayed Cardiac Rupture Induced by Traumatic Myocardial Infarction: Consequence of a 45-Magnum Blast Injury; A Comprehensive Case Review

Systematic Review of Penetrating Cardiac Injury by a Firearm: Forensic Implications

Penetrating injuries of the heart, named penetrating cardiac injury (PCI), may cause hemorrhagic shock as well as cardiac tamponade, leading to death if not treated immediately. This systematic review aims to highlight the main aspects of penetrating cardiac injuries after firearm wounds. The cases of 39 subjects (age 37.05 + 15.4) were selected (6 fatal cases). Specifically, 4/39 cases involved subjects under 18 y.o.; analyzing the entrance wound, in 30/39 cases it was located in the anterior chest, 4/39 in the posterior chest, 3/39 in the shoulder/axilla area, 1/39 in the neck, and 1/39 in the pelvis (gluteus). The exit wound was found in only 3/39 cases. Several factors may influence the prognosis: firstly, prompt intervention represents a crucial point, then considering the complications related to PCI, the most important are myocardial infarction, and projectile migration with embolization. The mortality rate is related to: (1) area and severity of the heart injury; (2) duration of transport and intervention; (3) contemporary lesion to other organ/s; (4) the quantity of blood lost; (5) and presence/absence of cardiac tamponade. Based on these findings, a correct approach in the management of PCI may be considered important from a forensic point of view, both as regards to medical liability and from the trial perspective.

Thoracic compartment syndrome after penetrating heart and lung injury

Thoracic injuries are the most lethal penetrating injuries. After attempting suicide, two patients with a penetrating thoracic wound were admitted to our emergency department. During CT scan they became hemodynamically unstable, which is why we had to perform an emergency thoracotomy. In both cases, a perforation in the left ventricle as well as multiple lesions of the lung parenchyma and vessel injuries were found. After the treatment of the different injuries, a massive edema of the heart and lung prevented a primary closure of the thorax. Due to massive diffuse bleeding, a "packing" of the pleural cavity became necessary. To prevent a thoracic compartment syndrome, the thoracic wall was left open and the skin was closed with a plastic sheet. Due to the "open chest" procedure combined with "packing" of the thoracic cavity, the majority of patients with an edema of the heart and lung after a penetrating chest injury can be saved. Pitfalls of preclinical and clinical treatment, aspects of diagnostics and surgery are discussed.

[Morphological analysis of cardiac rupture due to blunt injury, cardiopulmonary resuscitation and myocardial infarction in forensic pathology]

OBJECTIVE

To analyze the morphological features and forensic pathological characteristics of cardiac ruptures of different causes for their differential diagnosis.

METHODS

We analyzed the data of 44 autopsy cases of cardiac rupture from 2014 to 2017 in our institute, including 11 cases caused by blunt violence with intact pericardium, 4 caused by cardiopulmonary resuscitation (CPR), 9 by myocardial infarction, and 20 by aorta dissection rupture.The gross features and histopathological characteristics of cardiac rupture and pericardial effusion were analyzed and compared.

RESULTS

Cardiac ruptures caused by blunt violence varied in both morphology and locations, and multiple ruptures could be found, often accompanied with rib or sternum fractures; the volume of pericardial effusion was variable in a wide range; microscopically, hemorrhage and contraction band necrosis could be observed in the cardiac tissue surrounding the rupture.Cardiac ruptures caused by CPR occurred typically near the apex of the right ventricular anterior wall, and the laceration was often parallel to the interventricular septum with frequent rib and sternum fractures; the volume of pericardial blood was small without blood clots; microscopic examination only revealed a few hemorrhages around the ruptured cardiac muscular fibers.Cardiac ruptures due to myocardial infarction caused massive pericardial blood with blood clots, and the blood volume was significantly greater than that found in cases of CPR-induced cardiac rupture (P < 0.05);lacerations were confined in the left ventricular anterior wall, and the microscopic findings included myocardial necrosis, inflammatory cell infiltration, and mural thrombus.Cardiac tamponade resulting from aorta dissection rupture was featured by massive pericardial blood with blood clots, and the blood volume was much greater than that in cases of cardiac ruptures caused by blunt violence, myocardial infarction and CPR (P < 0.05).

CONCLUSIONS

Hemorrhage, inflammatory cell infiltration, and lateral thrombi around the cardiac rupture, along with pericardial blood clots, are all evidences of antemortem injuries.