Studies on the Estimation of the Time after Death using a New Technique

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  • 死斑退色度検査の新改良法による死後経過時間推定への応用

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The discoloration of postmortem lividity produced by fingerpressure is utilized for the estimation of time after death (TAD). The authors re-evaluated the relationship between TAD and the discoloration of postmortem lividity by comparing the use of a tuberculin syringe (1.0cc) instead of fingerpressure in 230 medico-legal autopsies. 1. The degrees of the discoloration by an injection syringe (standard discoloration index) were expressed in numerical values of 1.0 to 6.0 in cadavers examined up to approximately 50 hours after death. The standard discoloration index (SDI) is the average value for measurements of 5 regions per cadaver. 2. The correlation coefficient between SDI and TAD in 158 supine cadavers was 0.898 (p<0.01). 3. Generally, the SDI revealed high values in cases exhibiting ecchymosis over areas of postmortem lividity. 4. The correlation coefficient between SDI and TAD in 125 supine cadavers, excluding those with ecchymosis, was 0.980 (p<0.01). 5. The SDI of cadavers with acute heart failure and asphyxia produced high values while the SDI of cadavers with loss of blood, head injury, traumatic shock and cardiac tamponade was lower. 6. The TAD estimation by the injection technique appears to be more practical than the conventional fingerpressure method.

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