Antemortem injuries
Antemortem injuries refer to injuries sustained before death and hold significant importance in death investigations. Distinguishing these injuries from postmortem injuries is crucial for accurately determining the cause of death and understanding the circumstances surrounding it. Pathologists assess the nature of bleeding and bruising, as well as the type of tissue damage, to identify whether injuries were inflicted while the individual was still alive. For instance, antemortem tissues contain leukotriene B4, a marker of inflammation that is absent in tissues damaged after death. Investigators also evaluate healing processes in wounds to determine the timeline of injuries, which can reveal patterns of abuse or trauma leading up to the individual's demise. Recent advancements, such as Fourier transform infrared spectroscopy, have improved the ability to differentiate between antemortem, perimortem, and postmortem fractures. Understanding antemortem injuries is pivotal in piecing together a victim's history and the events leading to their death, providing vital insights for medical examiners and law enforcement alike.
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Antemortem injuries
DEFINITION: Injuries received before death.
SIGNIFICANCE: In a death investigation, it is important to determine which injuries the person sustained before death as opposed to any injuries that occurred to the body postmortem (after death) because antemortem injuries may indicate the cause of death or factors that contributed to the death.
To determine cause of death accurately, a pathologist must distinguish between the injuries to a body that were received before death and those that were received after death. The pathologist must also determine whether the body shows of any injuries that occurred well before death. The most difficult determination to make involves which injuries were received immediately prior to death and which occurred immediately after death.
One significant difference between antemortem and postmortem injuries is in the ways in which the wounds have bled or bruised. It is possible for bleeding to occur after death, and, depending on the type of death, it is possible for bruising or pooling of the blood to occur postmortem, but a pathologist can generally tell by the way a wound has bled or bruised whether it is an antemortem injury.
A pathologist also looks at the type of tissue damage associated with injuries to determine when the injuries occurred. Tissues from antemortem injuries contain leukotriene B4, which living tissues produce in a chemical response to inflammation. Tissues that have been damaged by postmortem injuries do not contain this chemical. This information provides another way for the pathologist to determine exactly when injuries occurred.
In a case in which the body has been in water, the pathologist examines lung tissue to determine whether the person drowned or the body was put into the water after death. This tissue can show signs of whether the person struggled to breathe and began coughing before death or whether the lungs simply filled with water after death had already occurred.
The pathologist must also determine which antemortem injuries were the cause of the death as opposed to injuries that may have been received days, months, or even years before the death occurred. To do this, the pathologist looks for evidence of healing, such as wounds that have begun to close or bones that have begun to knit together, to eliminate those injuries as factors contributing to the death. Such older injuries can be significant clues in the determination of cause of death. For example, in cases of deaths resulting from or domestic violence, bodies may evidence many injuries in various states of the healing process, showing a pattern that can help investigators establish the history of abuse. This pattern may also occur in victims who were tortured before death.
In 2020, a study successfully used Fourier transform infrared (FTIR) spectroscopy and chemometrics to identify and differentiate between antemortem, perimortem, and postmortem fractures in a rabbti. This system was significantly more accurate than other experimental models, including other forms of advanced imaging. Scientists noted that differences in proteins, particularly amide I and amide II, could be used to differentiate between the types of injuries.
Bibliography
James, Stuart H., and Jon J. Nordby, eds. Forensic Science: An Introduction to Scientific and Investigative Techniques. 2d ed. Boca Raton, Fla.: CRC Press, 2005.
Jaiyeoba-Ojigho, Efe Jennifer, et al. "Investigating Antemortem, Perimortem, and Postmortem Injuries: Forensic Implication." Bangladesh Journal of Medical Science, Jan. 2021, doi: 10.3329/bjms.v20i1.50345. Accessed 13 Aug. 2024.
Kyllonen, Kelsey M., et al. "Postmortem and Antemortem Forensic Assessment of Pediatric Fracture Healing from Radiographs and Machine Learning Classification." Biology, 2022, doi: 10.3390/biology11050749. Accessed 13 Aug. 2024.
Shkrum, Michael J., and David A. Ramsay. Forensic Pathology of Trauma: Common Problems for the Pathologist. Totowa, N.J.: Humana Press, 2007.
Timmermans, Stefan. Postmortem: How Medical Examiners Explain Suspicious Deaths. Chicago: University of Chicago Press, 2006.
Yu, Kai, et al. "Identification of Antemortem, Perimortem, and Postmortem Fractures by FTIR Spectroscopy Based on a Rabbit Tibial Fracture Model." Spectrochimica Acta Part A: Molecular and Biomoleculary Spectroscopy, 5 Oct. 2020, doi.org/10.1016/j.saa.2020.118535. Accessed 13 Aug. 2024.