Post-Mortem Procedures
The following lists both the ideal and not ideal conditions that exist on this study for collection of specimens:
Ideal
- Post Mortem Interval (PMI) is <24 hours
- Ideal tissue collection minimally includes brain, spinal cord, peripheral nerve, muscle, thymus (if available) lymph node, and spleen. Tissue is suitable for freezing and formalin fixation
- Post mortem fluid collection includes cardiac aspiration of clot and serum ( if possible) and CSF
- Some sites may also collect samples of other tissues such as tumor, heart, lungs, gut, skin, endocrine, etc., on a case by case basis.
Not Ideal
- Prolonged PMI because pt. is found dead at home, uncertain time of death, legal or transport problems in retrieving remains
- Tissue is not available or is seriously damaged by prolonged PMI, hypoxia/ischemia, prolonged period on respirator, herniation, radiation etc. Only formalin fixation can be used.
- Clotting/lysis begins in perimortem period. Cardiac fluid (if extracted), may contain debris and hemolytic products. Cannot extract intact WBCs. CSF is extracted from brain or spine by use of a needle and syringe. Frequently such CSF contains tissue, blood or cellular debris. Usually has to be centrifuged to remove RBC so CSF WBC rarely collected/stored.
- Tissues such as gut are particularly fragile; family may refuse to donate certain organs
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