Topic 1.4
Limitations and challenges
The technology has real limitations: we can't preserve people alive, we can't currently reverse the process, and quality degrades rapidly once decay starts. Some of these are engineering problems that money and time might solve. Others might be fundamental barriers with the current technology. You need to understand which is which and where the uncertainty actually lies, so you can form calibrated beliefs about what you're actually signing up for and what plausible futures look like.
The critical race against cellular decayEvery minute between your heart stopping and your brain reaching cryogenic temperatures is measurable, irreversible damage. Cryopreservation is a race against biochemistry, and biochemistry does not wait.Why can't we cryopreserve a person alive?Two reasons you cannot be preserved while still alive: it would be homicide, and the procedure itself would kill you. Cryoprotectants are toxic at warm temperatures.Why is revival currently not possible?The honest statement of where cryonics stands today. We can preserve, but we cannot yet revive, and here are the specific reasons why.Technical challenges for high quality preservationWhat separates an excellent preservation from a poor one: the five technical obstacles, from ischemia and no-reflow to ice, toxicity, and uneven perfusion, that decide case quality.Technical challenges for reversible cryopreservationPreserving someone is the easier half. Reversing it, rewarming, removing toxicity, and repairing damage, is the unsolved half, and here is exactly where the hard problems are.