Karlsmark T, Aalund O, Danielsen L, Thomsen H K, Nielsen O, Nielsen K G, Genefke I K
Department of Dermato-venereology and Pathology, Bispebjerg Hospital, Copenhagen, Denmark.
Forensic Sci Int. 1988 Dec;39(3):245-55. doi: 10.1016/0379-0738(88)90127-2.
Deposition of calcium salts on collagen fibres has been shown to occur in cathode areas from 2 days to 2 months after exposure to direct current (d.c.) via contact knobs measuring 12 mm in diameter using energy level from 0.5 to 96 J and on day 7 after exposure to alternating current (a.c.) via pointed electrodes using energy level from 30 to 50 J. In order to determine the statistical relation of this histological observation to the type of energy applied 1095 biopsies from 49 pigs including biopsies from skin areas exposed to heat, 50 Hz a.c., 100 kHz a.c. and d.c. as well as from unexposed skin were examined. The specificity was 1.0 using calcium deposition as the test criterium. The sensitivity for cathode areas was found to vary from 0.52 to 1.0 depending on the biopsy technique and the number of days after exposure. Calcium salts on collagen fibres seem uniformly to be present in the cathode area from day 4 to 7, the positive test answer being depending on the biopsy technique. For 50 Hz a.c. the sensitivity using a pointed electrode was found to vary from 0.08 to 0.27 dependent on the number of days after exposure. For all other types of energy the sensitivity was 0.
通过直径为12毫米的接触旋钮施加0.5至96焦耳的能量，在暴露于直流电（d.c.）后的2天至2个月内，以及通过尖头电极施加30至50焦耳的能量在暴露于交流电（a.c.）后的第7天，已证明胶原纤维上会出现钙盐沉积。为了确定这种组织学观察结果与所施加能量类型之间的统计关系，对49头猪的1095份活检样本进行了检查，包括来自暴露于热、50赫兹交流电、100千赫兹交流电和直流电的皮肤区域以及未暴露皮肤的活检样本。以钙沉积作为测试标准时，特异性为1.0。发现阴极区域的敏感性根据活检技术和暴露后天数的不同，在0.52至1.0之间变化。从第4天到第7天，胶原纤维上的钙盐似乎在阴极区域均匀存在，阳性测试结果取决于活检技术。对于50赫兹交流电，使用尖头电极时的敏感性根据暴露后天数的不同，在0.08至0.27之间变化。对于所有其他类型的能量，敏感性为0。
