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How and why does the platelet count in postmortem blood change during the early postmortem interval?
H Thomsen1, H J Kaatsch, B Krisch
1Department of Forensic Medicine, Christian-Albrecht University of Kiel, Germany.
Forensic Science International
|July 15, 1999
Summary
Early postmortem platelet counts initially rise due to hypostasis, then decrease from thrombolysis and reversible platelet aggregation, not clotting. This impacts forensic blood analysis.
Area of Science:
- Forensic Science
- Hematology
- Postmortem Medicine
Background:
- Accurate postmortem platelet counts are crucial for forensic investigations.
- Understanding early postmortem blood changes is essential for interpreting evidence.
Purpose of the Study:
- To investigate the dynamics of platelet counts in early postmortem blood.
- To elucidate the mechanisms behind observed changes in platelet numbers.
- To differentiate between true clotting and other causes of platelet reduction.
Main Methods:
- Platelet counting in postmortem blood.
- In vitro hypostatic tests.
- Erythrocyte volume estimation.
- Immunohistochemistry (anti-CD61, anti-fibrinogen).
- Immunoelectron microscopy (anti-CD62, anti-CD63, anti-thrombospondin).
Main Results:
- An initial increase in platelet count was attributed to hypostatic phenomena.
- A subsequent decrease was linked to postmortem thrombolysis and reversible platelet aggregation.
- Platelet adhesion to erythrocytes was observed, influenced by the postmortem blood environment.
Conclusions:
- The decrease in postmortem platelet count is due to reduced countability, not clotting.
- Hypostasis initially elevates, while thrombolysis and aggregation decrease, postmortem platelet counts.
- Reversible platelet adhesion to erythrocytes is a key factor in postmortem platelet dynamics.