Biochemical blood markers and sampling sites in forensic...
Transcript of Biochemical blood markers and sampling sites in forensic...
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Biochemical blood Biochemical blood markersmarkers and and
sampling sites in forensic sampling sites in forensic
autopsyautopsy
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Present by Pornvenus Ngamsamer
52312322
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Introduction
� Antemortem Information :
Present and Past illness make a decision on the
basis of autopsy findings
� Biochemical analysis of postmortem blood
help in evaluating, determining case of death
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� Forensic pathologist hesitated to use blood
chemical
• Large postmortem change
• Large deviation from healthy subject
� This Research chose to measure 11 markers
in blood from 3 sampling site
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� The cost 11 markers were very low
• cause markers are routinely measured in clinical lab
� Research aim was
• to investigate how biochemical marker from
postmortem change
• showed differences between the etiology of death
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• determining suitable sampling sites
• considering when selecting markers and interpreting
results
� Research aim was
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Materials and methods
� Blood samples
• was obtained from 164 autopsy cases in University
of Tokyo from April 2003-March 2006
• average age 54.9 ± 21.8
• Male 112 case, Female 52 case
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Interval of Sampling specimens case
0-12 h 25
13-69 h 69
25-48 h 54
49-72 h 16
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cause of death case
blunt injury 52
sharp injury 7
asphyxiation 18
drowning 4
fire death 5
intoxication 9
internal death 39
other 30
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� Blood samples (continue)
• was sampled within 72 h postmortem
• from right and left heart cavity and femoral vein
• the sera was stored at -20°C
• the whole blood was stored at 4 °C
• shipping to laboratory of SRL where were
analyzed within a day
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� Biochemical analyze
• used the sera volume for 11 markers was 2 ml
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Test MethodStandard Range of
Healthy diagnosis
HbA1C Latex 4.3-5.8%Chronic
hyperglycemia
Fructosamine Calorimetry 205-285 mMChronic
hyperglycemia
BUN Urease UV 6-20 mg/dl Renal failure
Creatinine Enzymemale 0.61-1.04, female
0.47-0.79 mg/dl Renal failure
Total protein Biuret 6.7-8.3 g/dl Malnutrition
Total bilirubinVanadinate
oxidation 0.2-1.0 mg/dl Liver function
γ-glutamyl
transpeptidase
JSCC
Standizati
on
male <70, female <30
IU/ml Liver function
Triglyceride Enzyme 50-149 mg/dl Hyper lipidemia
Total cholesterol Enzyme 150-219 mg/dl Hyper lipidemia
CRP Latex <0.3 mg/dl Inflammation
Pseudocholine esterase Rate assay
male 242-495, female
200-495 IU/l
Liver function and organic
phosphate poisoning
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Result
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• HbA1C showed the smallest deviation from healthy
subjects (24.8%)
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• Negligible postmortem change
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• HbA1C has no difference due to etiology of death
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� HbA1C and Fructosamine were indicated
chronic hyperglycemia
� But Fructosamine showed large deviation
from healthy subjects
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HbA1C is good marker for chronic hyperglycemia in forensic
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Why ?
� Because Hemoglobin is cumulative process
rate of glucose concentration under life span
of erythrocytes
� But other markers evaluated are components
of destruction of tissue
� or components eliminated by functioning
organs
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• Total Bilirubin showed postmortem increase time-
dependently
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• But has small deviation from healthy subjects (37.3%)
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Total Bilirubin can be used as a
marker for Liver disease
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• They showed high deviation from healthy subjects
(74.3%, 64.1%)
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γγγγ-GTP, Pseudocholine esterase
are not appropriate for forensic
diagnosis
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� BUN, Creatinine are kidney injury markers
� BUN >100 mg/dl showed renal disease or
acute renal failure
� Becareful considering is associate with
severe hypoxia or skeletal muscle damage
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BUN is a good marker for renal
injury
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• Creatinine showed the extremely high ratio (95.1%)
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Creatinine cannot be recommended
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• Triglyceride was higher than healthy subjects
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• But decreased of time-dependent
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� Triglyceride level affected by ingestion or
starvation
Triglyceride cannot be used
postmortem marker
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• Total protein increased of time-dependently
• Intravascular fluid is infused to extravasation cause
overhydration
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• were difference in fire death-blunt, sharp injury and
fire death-Internal death
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� Fire death reflected intravascular
extravasation due to heat
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� For Sampling site
� HbA1C, Triglyceride, BUN,
Fructosamine : any site can be used
� Their values of any site were same
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� Total Bilirubin, CRP, γ-GTP, Total protein
are recommended femoral vein blood
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• They tend to increase postmortem
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• They showed lower value in Femoral vein blood
than the others
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� Creatinine is recommended left cardiac
blood
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• it showed increase time-dependently
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• Creatinine was lower level in left cardiac blood than
the ohers
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� Pseudocholine esterase, Total-Cholesterol
are recommended left cardiac blood
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• They tend to decrease time-dependently
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• They showed higher level in left-cardiac than the
others
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� Creatinine, Pseudocholine esterase,
Total-Cholesterol are recommended =
Left cardiac blood
� 8 markers = Femoral vein blood
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� We need the reliability of Standard value
in clinical medicine
� There is no perfect standard value from
forensic autopsies
� The sample are from the deceased with
various cause of death
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� This Research tried to calculate forensic
standard value
� HbA1C (forensic standard value) is
2.77-7.69%
But This value is guidline
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� Because
• Data of HbA1C is derived from lack of
information
• Lack of present and past illness
• Lack of backgrounds of the victims
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� If Data of HbA1C is derived from more
accurate value
� Have more apparent abnormal data
� Collecting more sample by known cause
with more information
Can obtain a genuine forensic abnormal value
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� What’s require?
� Forensic abnormal value
• Unexpected death without obvious cause
• Alcoholics with low postmortem blood
alcohol level
• Young adult with no apparent cause of
death
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Conclusion
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� HbA1C was clearly a reliable marker
� Total Bilirubin, BUN, Cholesterol
have been useful
• had set an appropriate limit range
• Been careful interpretation
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� Triglyceride decreased according to
postmortem interval
� The other markers did not significant
changes within 3 days of postmortem
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� In the same term of postmortem interval
Blunt injury
Sharp injury
Internal injury
Fire death
difference
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� Femoral vein blood is suitable sampling site
� Because its relatively slight postmortem
changes
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� Postmortem biochemistry is poorly understood
� Because of concern about
• Postmortem changes
• Large deviation from healthy subjects
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� Great potential Forensic service work
� Future Research into the sudden
unexpected death without obvious cause
� Young adult with no apparent cause of
death
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Next step for Forensic diagnosis
of Biochemical blood markers
Forensic Abnormal Value
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Thank you