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With every cryonics case, our first and most important tool for slowing degradation is external cooling. We have performed some basic testing on cooling rates for different kinds of external cooling. This is an ongoing project, and this page will be updated regularly with new data.
A temperature probe array was placed through a burr hole in the midline of the vertex of the calvarium. Opening was sealed with wax or epoxy, and scalp was approximated and stapled. An additional thermocouple was placed through the right nares and advanced into the nasopharynx. CT scan was performed to verify placement of all probes and to record for future analysis complex parameters such as volume and density. Cephalon was enclosed in a plastic bag and warmed in a water bath until stable at 37°C. Initiated one of a number of cooling protocols, using software to record cooling curves.
These are a few very preliminary results, subject to revision.
This chart summarizes the Averages from each of the above charts.
This comparison is from http://www.alcor.org/Library/html/fried.html. While this data is interesting, it's not very closely related to our data. In the comparison below, CPR was being performed, so blood was moving. Heat was was being transferred from the body core up into the brain, and also from the blood out into the bath. This is a more complex and variable scenario than our static cooling.