sophie
Proud Member
- Joined
- Jul 25, 2011
- Messages
- 172
- Points
- 0
there are a few drugs that were not tested in different places
im sure they tested for lorazepam in all relevant places: blood samples, liver, urine. lorazepam was ruled a contributing factor.
some substances are listed as ND in the lab reports, and some are omitted. i'm not sure what this means in the case of lorazepam and hospital blood. did they not detect it, or not test for it, or are they holding back what they found?
this is what the autopsy summary says on p12:
toxicology findings:
- propofol, lorazepam, midazolam, lidocaine, diazepam and nordiazepam, identified in blood samples
- propofol, midazolam, lidocaine and ephedrine identified in urine
- propofol and lidocaine identified in liver tissue
- propofol identifed in vitreous humor
- lidocaine and propofol identifed in stomach contents
so we can probably conclude lorazepam was not found in the liver and urine (even though the lab reports dont list it as ND), but it could still have been found in hospital blood and for some reason they didnt include the result in the published report.
if they indeed didnt test hospital blood for lorazepam, this is what i found on the subject of postmortem redistribution and lorazepam:
according to these source, the best place to get a "good" blood sample postmortem is femoral blood:
http://path.upmc.edu/cases/case407/dx.html
POSTMORTEM REDISTRIBUTION OF DRUGS:
Femoral blood is widely accepted as the most reliable postmortem specimen for drug analysis in forensic toxicology. There is considerable evidence that the drug concentrations in peripheral blood samples are closer to the antemortem level than the concentration in cardiac blood. In special cases where the diagnosis of overdose is to be used as judicial evidence, a single sample of blood may prove insufficient. In such cases, analyses of several samples of blood and tissue will increase the possibility of reaching a correct conclusion, but reference values on drug concentrations in tissues are often missing. The data suggests that there is a post-mortem diffusion of drugs along a concentration gradient, from sites of high concentration in solid organs, into the blood with resultant artefactual elevation of drug levels in blood. Highest drug levels were found in central vessels such as pulmonary artery and vein, and lowest levels were found in peripheral vessels such as subclavian and femoral veins.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2561112/
After death, and in the most favourable circumstances, it is possible to take samples of whole blood flowing from femoral veins: this sample is thought to be least susceptible to post-mortem change.
i also read lorazepam is a drug which does NOT redistribute after death:
http://books.google.ch/books?id=Bfd...q=lorazepam postmortem redistribution&f=false
NECROKINETICS
Table 1, Toxins and drugs in which postmortem redistribution does not occur
...
Lorazepam
...
Last edited: