ABSTRACT
With attention to high prevalence of fire death and its multiple problems for determination of death cause in charred body and differentiate antemortem from postmortem burn, make use of vitality sign, at fire, example blood carboxyhemoglubin [HBCO] level and presence of soot in air ways evaluated as indicator of antimortem burn. This study is analytic, cross-sectional that conduct in central LMO of IRI at 2005 -2006 and for this study we evaluate 47 charred fire victims, with attension of family and related members history, external examination and autopsy finding, penal recordes, definite antimortem and postmortem burn separated and then evaluate HBCO and presence of soot in victim's airways. A majority of victims 93.6% [44 cases] were male, 6.4% [3 cases] female. 59.6% [28 cases] of them were between 20-39 years old, postmortem burn 29.8% [14 cases] and antemortem burn was 40.4% [19 cases]. In victims with postmortem burn 92.9% [13 cases] have negative HBCO, and 7.1% [1 case] positive HBCO. But in cases with antemortem burn and evidence of life during fire progression 42.1% [8 cases] have positive HBCO, and 57.9% [11 cases] have negative HBCO. In cases with positive HBCO 80% [8 cases] have antimortem burn but in cases with negative HBCO 35% [11 cases] have postmortem burn. With attention to results, in cases with positive HBCO, 80% of victims [8 cases] have antimortem burn that show persons was alive during fire. But 10% of victims [1 case] has postmortem burn that it possible antimortem burn disappear with stability of burn after death. This title at reverse is not conclusive. This study shows that in victims with negative HBCO, search of other cause of death such as, homicide, natural diseases or suicide [for uses of accelerator substances] is more likely nessesary