A Study on the Estimation of Postmortem Interval Based on Environmental Temperature and Concentrations of Substance in Vitreous Humor |
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| Authors: | Mingzhen Yang M.D. Huijun Li M.D. Tiantong Yang M.D. Zijiao Ding M.D. Shifan Wu M.D. Xingang Qiu M.D. Qian Liu M.D. |
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| Affiliation: | 1. Department of Forensic Medicine, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China;2. Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China;3. Key Laboratory of Evidence Science, China University of Political Science and Law, Ministry of Education, Beijing, China |
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| Abstract: | A method to determine postmortem interval (PMI) based on environmental temperature and the concentrations of vitreous humor (VH) molecules were explored. Rabbit carcasses were placed in a chamber at 5, 15, 25, or 35°C, and 80–100 μL of VH was collected with the double‐eye alternating micro‐sampling method every 12 h. A Roche DPPI biochemical analyzer was used to measure the concentrations of six substances in VH samples. The interpolation function model and mixed‐effect model were employed for data fitting to establish equations for PMI estimation. The concentrations of K+, P, Mg2+, creatinine (CRE), and urea nitrogen (UN) exhibited an upward trend with increasing PMI in all temperature groups, while the concentration of Ca2+ showed a downward trend. Validation results using K+ and Mg2+ ions revealed that the mixed‐effect model provided a better estimation than the interpolation function model using the data from our experiment. However, both models were able to estimate PMI using temperature and VH molecule concentrations. |
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| Keywords: | forensic science forensic pathology postmortem interval environmental temperature vitreous humor interpolation function mixed‐effect model |
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