Development and validation of a postmortem radiological alteration index: the RA-Index.

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Serval ID
serval:BIB_63917B7DC409
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Development and validation of a postmortem radiological alteration index: the RA-Index.
Journal
International Journal of Legal Medicine
Author(s)
Egger C., Vaucher P., Doenz F., Palmiere C., Mangin P., Grabherr S.
ISSN
1437-1596 (Electronic)
ISSN-L
0937-9827
Publication state
Published
Issued date
2012
Volume
126
Number
4
Pages
559-566
Language
english
Notes
Publication types: Journal ArticlePublication Status: ppublish
Abstract
This study aimed to derive an index quantifying the state of alteration of cadavers by quantifying the presence of gas in the body using postmortem multidetector computed tomography (MDCT) imaging, and to validate the index by defining its sensitivity and specificity. The RA (radiological alteration)-index was derived from postmortem MDCT data from 118 nontraumatically deceased people. To validate the index, 100 additional scanned bodies (50 % traumatically deceased) were retrospectively examined by two independent observers. Presence of gas at 82 sites was assessed by a radiologist, whereas a forensic pathologist only investigated the seven sites used for the RA-index. The RA-index was highly correlated to the overall presence of gas in all 82 sites (R(2) = 0.98 in the derivation set and 0.85 in the validation set). Semiquantitative evaluation of gas presence in each site showed moderate reliability (Cohen's kappa range, 0.41-0.78); nevertheless, the overall RA-index was very reliable (ICC(2,1) = 0.95; 95 % CI 0.92-0.96). Examiner using the RA-index detected heart cavities full of gas with a sensitivity of 100 % (95 % CI 51.7-100) and a specificity of 98.8 % (92.6-99.9). We conclude that determining the presence of gas at seven sites is a valid means to measure the distribution of gas due to cadaveric alteration in the entire body. The RA-index is rapid, easy-to-use, and reliable for nonexperienced users, and it is a valid method to suspect the normal presence of gas from cadaveric alteration. MDCT can be used to screen for gas embolism and to give indications for gas composition analysis (gas chromatography).
Pubmed
Web of science
Open Access
Yes
Create date
22/07/2012 20:54
Last modification date
01/10/2019 6:18
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