Igari Yui, Hosokai Yoshiyuki, Funayama Masato
Department of Forensic Medicine, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
Department of Diagnostic Analysis, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
Leg Med (Tokyo). 2016 Mar;19:35-42. doi: 10.1016/j.legalmed.2016.02.002. Epub 2016 Feb 1.
In determining the time of death in infants based on rectal temperature, the same methods used in adults are generally used. However, whether the methods for adults are suitable for infants is unclear. In this study, we examined the following 3 methods in 20 infant death cases: computer simulation of rectal temperature based on the infinite cylinder model (Ohno's method), computer-based double exponential approximation based on Marshall and Hoare's double exponential model with Henssge's parameter determination (Henssge's method), and computer-based collinear approximation based on extrapolation of the rectal temperature curve (collinear approximation). The interval between the last time the infant was seen alive and the time that he/she was found dead was defined as the death time interval and compared with the estimated time of death. In Ohno's method, 7 cases were within the death time interval, and the average deviation in the other 12 cases was approximately 80 min. The results of both Henssge's method and collinear approximation were apparently inferior to the results of Ohno's method. The corrective factor was set within the range of 0.7-1.3 in Henssge's method, and a modified program was newly developed to make it possible to change the corrective factors. Modification A, in which the upper limit of the corrective factor range was set as the maximum value in each body weight, produced the best results: 8 cases were within the death time interval, and the average deviation in the other 12 cases was approximately 80min. There was a possibility that the influence of thermal isolation on the actual infants was stronger than that previously shown by Henssge. We conclude that Ohno's method and Modification A are useful for death time estimation in infants. However, it is important to accept the estimated time of death with certain latitude considering other circumstances.
在根据直肠温度确定婴儿死亡时间时，通常采用与成人相同的方法。然而，这些成人方法是否适用于婴儿尚不清楚。在本研究中，我们在20例婴儿死亡病例中检验了以下3种方法：基于无限圆柱模型对直肠温度进行计算机模拟（大野法）、基于马歇尔和霍尔的双指数模型并采用亨斯格参数确定法进行计算机双指数近似（亨斯格法）以及基于直肠温度曲线外推进行计算机共线近似（共线近似法）。将婴儿最后一次被看到活着的时间与被发现死亡的时间之间的间隔定义为死亡时间间隔，并与估计的死亡时间进行比较。在大野法中，7例在死亡时间间隔内，其他12例的平均偏差约为80分钟。亨斯格法和共线近似法的结果明显不如大野法。在亨斯格法中，校正因子设定在0.7 - 1.3范围内，并新开发了一个修改程序，使改变校正因子成为可能。修改A将校正因子范围的上限设定为各体重下的最大值，产生了最佳结果：8例在死亡时间间隔内，其他12例的平均偏差约为80分钟。热隔离对实际婴儿的影响可能比亨斯格之前所显示的更强。我们得出结论，大野法和修改A对婴儿死亡时间估计有用。然而，考虑到其他情况，以一定的宽容度接受估计的死亡时间很重要。
