This Podcast Will Kill You - Ep 187 Hypothermia Part 2: How it helps

Episode Date: September 9, 2025

Last week, we took you through all the ways that cold can harm us and the harrowing history of humans perishing at its icy hands. Ending the story there would be skipping over the parts where cold gets to play the hero, rather than the villain. In the second installment of this frosty miniseries, we explore the situations in which we might use cold to protect us and how it actually works. We also delve into the surprisingly long (and unsurprisingly grim) history of therapeutic hypothermia, a journey that wouldn’t be complete without a debate over sea cloaks, a reconsideration of the plot of Titanic, and a brief jaunt into cryonics. Support this podcast by shopping our latest sponsor deals and promotions at this link: https://bit.ly/3WwtIAuSee omnystudio.com/listener for privacy information.

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These early studies of hypothermia were stopped. I was born weighing 3,970 grams at full term after an uncomplicated pregnancy, labor, and delivery. As reported, at one minute after birth, I became apnic and did not respond to resuscitation. After five minutes, I was placed in an ice water bath. My breathing was reported to recover after 28 minutes of hypothermia. At 45 minutes of life, my capillary pH was 6.9, but recovered steadily, and I was discharged at day three. Subcutaneous fat necrosis developed between two and four weeks of age. The calcium

deposits were largely cleared by six months. My serum calcium remained normal, and my weight gain and development were considered appropriate at that age, but no further follow-up was reported. 53 years after these events, I have had a very normal life. Although my mother teased me about my skin in childhood, I never had any apparent skin problems as a child or later. I was a keen sportsman at school. My handwriting was never a strength, and so I taught myself to touch type, which turned out to be an advantage in the computer age. At the same time, it is interesting to note that I can easily thread a needle. Academically, I did very well throughout school and university. I was awarded my PhD in 1998 and have served at my current institution as department chair and faculty senate president. In retrospect,

I strongly believe that the benefits of treatment clearly outweighed the costs, and that the abrupt cessation of these early studies of therapeutic hypothermia represented a missed opportunity. If the opinion of my parents had been sought at the time or subsequently my opinion, we would have favored continued trialing of this promising treatment. Fascinating. It's really an interesting, I don't know that I've ever read a report or like of someone who had been a recipient of therapeutic hypothermia, like especially from so long ago. Like it's really interesting.

Yeah, it's really good find, Darren. Thank you. I don't remember how I found it. Well, I can tell you where it's from. That was by Robert Carlson in a pediatric research from 2021, an article titled 53 years of follow-up of an infant with neonatal encephalopathy treated with therapeutic hypothermia. It's fascinating. And I feel like that, yeah, the first-hand account much, much later, because it's not like he remembers. members this happening. Right. It's like he's clearly reading some of the like medical, you know,

records of his birth and treatment thereafter and then and then talking about his life since. Like, it's so interesting. Yeah. And I'm so curious to know how this episode shakes out with like what you find. But like the point, I feel like, I feel like the thing that stuck out to me when it comes to that is that maybe it was a little bit of missed opportunity. Maybe it was a little bit of of, you know, understandable hesitation to pursue trials. But ultimately, it's like, how do you, how do you make scientific discoveries that do not harm people or have the potential to harm people? And that's, you know, we've come a long way in the 20th century because of that. So yeah. Anyway, hi, I'm Aaron Welsh. And I'm Aaron Alman Updank. And this is, this podcast will

kill you. And we're coming back with our second part on hypothermia. As promised. As promised. This is hypothermia can be good. Cold can be good. Cold is not always bad. Yeah. Yeah.

However you want to say it. Yes. It's the history of therapeutic hypothermia. It's really so much to learn. I am thrilled. I know literally nothing about the history prior to 2002. Oh. Yep.

Okay, doke. Well, I'll teach you some things that I have discovered. Great. But we've got a few things. This is off to a great start, Aaron. We've got a few things to tackle before we can get into like the meat of the episode. It's quarantini time. It's quarantini time. We're still, we changed it. Yeah. Oh, uncommon cold. The uncommon cold. Yeah. That's what we're drinking. That's what we're drinking. Yep. We should probably. I'll do that again, though, right?

Nah. Okay. This is gold, Aaron. This is gold. The uncommon cold. It's a habanero margarita, spicy margarita. Because it's blended, it's cold, there's ice in it, but also there's like a little bit of warmth, you know. It's on our website.

Yeah, and also alcohol does not make, is not a treatment for hypothermia as we covered last episode. Don't. as a reminder. Yeah. It's on our website. This podcast, we'll kill you.com. It's on our social media channels. This is going really well.

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That's Q-U-I-N-C-E-com slash this podcast to get free shipping and 365-day returns. Quince.com slash this podcast. I left off last week with the story of the amazing recovery of Anna Baganholm, whose body temperature dropped to 13.7 degrees Celsius or 56.6.6 degrees Fahrenheit. What? I still can't get over it. I know. So, is that like the, is that in the Guinness Book of World Records?

Like, is that the record or? I don't trust the Guinness Book of World Records anymore. I don't think I ever did, but like, yeah. Not after a gallstone mishap. Mm-hmm. Yeah, hugely lost faith. But yeah, she might be in there. Wow.

But in that episode, Erin, last week, you also took us through all the ways that the cold can hurt or even kill us and how we can reverse or halt some of that damage. but it would be unfair to the cold for us to end the story there, just showing its villainous side, because while the cold has claimed many lives and fingers and toes and noses, it has also saved many as harnessed by modern medicine. And so this week, I want to tell the story of how humans have attempted to use cold successfully or unsuccessfully to save or prolong lives. we have long used cold as a topical treatment for various aches and pains, swollen joints, battle trauma, and fever. Ancient Egyptian, Greek, and Roman physicians all called for cold to be used in various ailments. You know, the oldest medical writing, hailing the benefits of cold comes from the Edwin Smith scroll, dating to 1600 BCE.

It details a recipe to cool blisters. So it's more about like a cooling sensation than the cold itself. But still. Okay. Still. Yeah. Cold can feel good. Cold can feel good.

And Hippocrates, of course, was a big believer in cold, especially for those of a warmer temperament. And he also wrote that this is, yeah, infants left out in winter, like left out infants, survived longer than babies left out in the summer months. I'm sorry. I don't, yeah. Like, first of all, what? Also, second of all, I miss this a little bit, but you just said of a warmer temperament? Oh, yeah. You know, like tempers or not tempers.

Oh, like humors? Humors. Humors. Oh, my gosh. I was like, we just did a whole episode. We just did a whole episode on it. Honestly, the sweater is making me overheat. Well, maybe you have a warm temperament and you need some cold.

Next week, hyperthermia. Just kidding. But no, so I have no idea. Was this an experiment? Was this just like lore, you know, I don't know. I mean, so like babies can definitely overheat. Yes.

In warmer temperatures, in many cases more quickly than they will. But like we said last week, because of their body surface area to volume ratio, they're also, you know, going to be more susceptible to hypothermia too. So it's it is both and. How about that? Both and. I mean, really anything is possible with Hippocrates. Like, yeah.

I don't know. But beginning in the 1600s or so, there was a shift in thinking. Like, if a little localized cold was helpful to relieve joint pain and whatnot, then a full body cold soak would be even better, right? Cold baths became all the rage, and advocates claimed that they cured every ailment under the sun, especially fevers, which honestly, maybe they did. I don't know.

But by the way, this made me think, I was, I did a little digging. in this episode because I was like, oh, yeah, fevers, that sometimes can be adaptive. That sometimes can help us to fight off infections. Can hypothermia ever be adaptive in that way? Is there any reason that it would be protective? So I did some digging, and yes, I did find that a few people suggested that maybe a hypothermic response, like sometimes people get hypothermic in sepsis, for instance, could be a last-ditch effort to conserve energy and protect against damage from inflammation.

but I also see your face right now, which is very questioning. And that's how I feel, too. Because how do you disentangle that from the body just not having the energy to maintain a fever? Or even just like normal body temperature. Right. And I will say, like, what is the driver of it? I don't know. But what is the outcome of it?

We do know that hypothermia in case, like, unintentional hypothermia. We're going to talk later and today about like intentionally reducing someone's body temperature. But if someone is so sick with an infection and they end up hypothermic, it's usually quite a bad sign that things are not going well and it's usually poor outcomes. Yeah. Yeah. So it's not like it seems to me that we have no evidence to suggest or very little. None that I found that it's an adaptive response and it's more just the body shutting down. Yeah.

It's not like our, it's not like a fever where our hypothalamus is like, hey, let's raise the body temperature. Our hypothalamus doesn't go, hey, let's lower the body temperature. I didn't find any data that that happens. And humans. No. And other animals like you talked about, they're doing it all the time. They're doing it for other reasons, too. It's like not a switch that they flip.

Yeah, exactly. Yeah. Yeah. Okay, anyway. I love this. Already. I'm glad. Don't we love to just like some easy swing and just bat down ideas?

Yeah. Hypotheses. No. Push. Oh, my God. Okay. So one of the biggest cheerleaders for cold baths was this. guy named James Curry. And I mentioned him in our fever episode last year as the mastermind behind

many enthusiastic cold water treatments where he like continually doused people with freezing water, even past the point where they were like, no, please, no, no more. Uh-huh, uh-huh. I feel like I remember this. Yep, yep, yep, I do. Well, I don't know. I don't remember if I got into this in the episode, but one of the reasons that he became so evangelical about cold water treatment is because in the early 1770s, he observed a ship. wreck in the freezing waters of the North Channel. When rescue finally came, the survivors tended to be those who stayed in the water while those who waited on top of the ship more often perished. And that made me think of Titanic and Jack and Rose, you know, because by this logic, shouldn't Jack

have survived? Spoilers. But like, he doesn't. He doesn't. Sorry. Spoilers. Sorry if that's a spoiler for anyone. No, it got spoiled. for me by a neighborhood friend in when it came out and it was trauma like that like has made me hate spoilers so much. Oh yeah. You know how I feel about spoilers. I mean who like spoilers. But yeah. It also, I just want to say that that does not make any sense because of what we talked about last week with how water is a much better conductor of heat than air. And so immersion in even, I mean the water in Titanic was like below freezing, very cold. But even immersion in like water that's like 60 or 70 degrees can cause hypothermia in a number of hours where it would take a very, very

prolonged exposure with no clothes at all to be hypothermic in those temperatures in air. Yeah. I mean, you know, if only we had Curry himself here to question and be like, bro. Yeah. What was your sample's eyes? I think he was just watching from a distance and how he could even know were the people who were on the shipwreck or on the remains of the boat where they also soaked in water, Did they fall off occasionally?

You know, like... Right. Was it that they were soaking wet and then there was wind chill or something like that, maybe? Could be. Was the air temperature colder and the water temperature was not that cold and then there was wind chill? Maybe. I mean, the bottom line is that he was like convinced. Cold water is where it is at.

Well, we know you can't change their minds. You can't, yeah. And, oh, by the way, speaking of Titanic. Okay. So of the nearly 500 deaths from the Titanic, from that Titanic, I mean, do I need to say anymore, were classified as drowning when, in fact, they were probably hypothermia. Yeah. Makes just an interesting.

I think that kind of, but it shows to me it demonstrates sort of the public's understanding of hypothermia and what was happening in that situation. Yeah. Okay. So the other reason that Curry was psyched about cold baths was reading about the experience of this guy, Dr. William Wright, who used cold water to treat a fever that he had. which was likely typhoid fever. All right. Quote. September 9th, having given the necessary directions about three o'clock in the afternoon, I stripped off all my clothes and threw a sea cloak loosely about me till I got upon deck when the cloak was also laid aside. Three buckets full of cold salt water were then thrown at once on me. The shock was great, but I felt immediate relief.

The headache and other pains instantly abated, and a fine glow and diapheresis succeeded. Towards evening, however, the febrile symptoms threatened return, and I had recourse again to the same method as before, with the same good effect. I now took food with an appetite, and for the first time had a sound night's rest. I love that image. What is a sea cloak? Can I have one? I'm assuming towel, no? I'm picturing something quite much more majestic than a tally. towel. I'm calling my towel sea cloak from this point forward. Can you help me fold the sea cloaks, please? Do you know that never in a million years would I have assumed that it's a towel?

I have no idea. Somebody, we need to look this up. Of course it's a towel, but I never would have helped that. And mine office. It's just a branding opportunity. It really is. Someone make a sea cloak. Okay, but also like that's a hilarious. So that is the account that made this guy Curry be like cold baths, cold baths for everyone, cold baths for everything. Yeah. I mean, it's not that much different than like watching a TikTok video today and being like cold baths.

You can find a lot of those videos on TikTok right now. People are really into cold baths. Yeah. Yes. Yeah. And so, but this like really took many different places by storm. spas sprung up where you could alternate between hot and cold waters, which is quite delightful. And the benefits of cold water plunges were widely hailed, even before the TikTok bros, you know, came on the scene.

But cold treatments weren't always used with consent. In the 1600s, cold water dunking was occasionally employed as a cure for mental illness, where it proved not only ineffective, but also cruel, torturous, and even deadly in some cases. there were dunking stations built on the grounds of some asylums. Oh, my gosh. That's awful. The logic behind this was that, okay, well, if mental illness is caused by a fevered brain, you need to cool it by any means necessary. So as an example, in 1725, a woman who was accused of neglecting her husband was forced while restrained to stand under a torrent 15 tons of. of freezing water for 90 minutes until she promised she would become a loving and obedient wife.

Torture. That's like, I mean, what else do you call it? That's literally torture. That's just actual torture. Yeah, yeah. What? Uh-huh. And not to mention ineffective on medical grounds. But even if it were effective, it's not like that would justify its use. Also, it's a mental disorder to not be nice to your husband. Right. I know. I told my husband, this and he was like, what is neglectful meat? Like what does that mean? What does that mean?

Right, right. So many questions. I know. Because sandwich wasn't made crispy enough or like it was too crispy and it, you know, when it scratches the top of it? Yeah, the Captain Crunch syndrome. Yeah. Yeah. Just shreds the roof of your mouth. That's what it is. She made his sandwich like that. Mm-hmm. I mean, yeah.

Still don't think it deserves 15 tons of freezing water, but, you know, that's just my opinion. Just our opinion. Just our opinion. Okay. But yeah, and so as much as I would like to tell you that this type of thing fell out of favor and was never used again by anyone in medicine, unfortunately, I cannot. In fact, it was the torturous use of cold on non-consenting individuals that led to cold therapy being dismissed as an illegitimate and groundless therapy, even when one doctor showed evidence to the contrary. While in medical school in the early 20th century, Temple Faye was stumped by a question on a quiz. Why does metastatic cancer rarely appear in the limbs?

He had no idea. He was like, I don't know what to put here. So he asked his professor like, hey, what's the answer to this? And his professor was like, I don't know either, actually. Why did they put it on the quiz? I don't know. I don't know. Okay. Yep. But the puzzles stuck with him.

And so in the 1930s, Fay decided that he wanted to try to solve it. Okay. His primary hypothesis had to do with temperature. So he figured that parts of the body with higher temperatures were more likely to promote cancer growth, while cooler parts, the extremities, discouraged growth. It would stand to reason then that if you cooled a metastatic growth, you could arrest cancer. development. So operating under this logic, Fay devised a few local refrigeration experiments, first in chicken embryos, then tissue culture, and then in humans. His first patient was a woman

who was experiencing extreme pain from a cervical carcinoma. He inserted a device of his own making into the mass, like a hollow metal capsule through which water flowed in a closed system, and he set it to cooling. Forty-eight hours later, the patient, was pain-free. And within five days, the tumor had actually shrunk a fair bit around the edges. Wow. The results encouraged Faye to invent more cooling instruments and setups, rubber bags, tubing, ice baths, and he tested out his hypothesis on other cancer patients.

His results suggested he was onto something. 95% of his patients reported an alleviation in pain. And 20 to 25% reported that their tumors shrank or grew. more slowly. I mean, this was the 1930s. So keep in mind that, like, other treatment options for cancer were really limited. Yeah. And when he presented his results, the broader medical community was stunned.

They had dismissed his ideas initially as just quackery. Like, what do you mean, you're just going to refrigerate that body part and suddenly you're all healed? And now they're like, hey, actually, maybe there is something to therapeutic cooling. What other applications can we find for this? And Faye himself would have likely gone on to develop his cold therapy further if a couple of things had not happened. The first was a series of cold therapy programs that began in the 1940s at a few hospitals in the U.S., notably McLean Hospital in Belmont, Massachusetts. Doctors would administer barbiturates to the patients of theirs who were the most seriously debilitated by mental illness and then place them in cold water for.

periods ranging from 10 to 38 hours. Oh, geez. Yeah. And yes, there were warming blankets on hand and the patients were being monitored, but still. This is patients with mental illness. Yes. These are not consented. This is not a...

Correct. This is not an institutional review board, which doesn't exist, approved study. Right. Right. Yeah. Okay. body temperature would drop into the 70s, Fahrenheit, 20s Celsius. Outcomes were allegedly positive. But it's not clear who's making the assessment, right? Like, is it the doctor who's, like, biased to think, oh, I want this therapy to work?

You know, is it the person self-reporting? Yeah. And it's also not clear how long any, you know, positive effects if they did exist, how long lasted. But they were encouraging enough for Scientific American to rave about them. Quote, for the first time, this new therapy, popularly known as human hibernation and technically as hypothermia, has apparently found a definite, valuable application in treating insanity, particularly schizophrenia or dementia precocks. Results in the cases study have been remarkable so that more extensive investigation of the possibilities and limitations of this treatment will surely be

forthcoming at the war's end, if not before, end quote. Okay. Yeah. A little bit of unchecked enthusiasm there. That went a bit too far, as it often does. And as more hospitals started cold therapy programs to treat mental illness, there was several of them that got started, illnesses, injuries, and deaths, even deaths occurred. So, for example, at the University of Cincinnati in 9th,000,

1943, 16 people were put into refrigerators for 48 hours. Two died and others suffered permanent brain damage. Yeah. Oh, geez. This had the understandable effect of halting interest in therapeutic hypothermia for any reason or for any condition, but it was, it wasn't the only thing to do so. It wasn't the only thing to kind of pump the break. So I mentioned that it was a couple of things that prevented therapeutic hypothermia from being, like, more investigated. The first being these U.S.-based programs, and the second was Nazis. Yeah. So, yeah.

This is one I knew about. Yeah. In 1939, Temple Faye submitted a manuscript to a publisher in Belgium, and somehow, the Nazis who had captured Belgium in 1940, came across it. Oh, no. They were already interested in hypothermia because their pilots often died in frigid waters, after being shot down, and they wanted to better understand how long someone could survive at what temperatures, which revival methods worked best, and when the point of no return was there, like what that point looked like, what it was. And they took inspiration from Faye's

paper to set up cold water immersion tanks at Dauau Concentration Camp, where they held people in the tanks at varying temperatures ranging from 36.5 degrees Fahrenheit, which is two 2 and a half degrees Celsius to 54 degrees Fahrenheit or 12 degrees Celsius. Sometimes they gave people pilot suits or flotation devices. Other times they stripped them and held them there naked for up to 14 hours. And over the course of the war, 360 to 400 experimental sessions were carried out involving 300 individuals. Oh, geez.

It's, yeah, there are many, many more horrifying details. of this torture that emerged after the war during the Nuremberg trials. And the news of these trials really poisoned any remaining interest in therapeutic hypothermia for almost two decades. No one wanted to be seen doing what had become characterized as Nazi science. Eventually, though, that characterization faded as people realized that cold therapy may still hold some promise. And as World War II became more distant, some researchers grew more comfortable with using the data generated by these torture sessions, believing that it could, quote, advance contemporary research on hypothermia and save lives, end quote. And it became, and really still is quite a controversial topic. Some people advocate for free, unrestricted use of this type of data and others saying that a ban is actually more appropriate.

No one. no one should be able to use this data. I mean, you're essentially benefiting from torture. Torture. Mm-hmm. Mm-hmm. In one way or another. Yep.

By 1984, though, over 45 publications had cited the hypothermia experiments at DACAW, implicitly or explicitly endorsing the use of such data. And I found a paper published in the New England Journal of Medicine in 1990 that discusses these hypothermia experiments specifically and the controversy surrounding them. And the author concludes with this, quote, on analysis, the Dachau Hypothermia Study has all the ingredients of a scientific fraud, and rejection of the data on purely scientific grounds is inevitable. If the shortcomings of the Dachau Hypothermia study had been fully appreciated, the ethical dialogue probably would never have begun. Continuing it runs the risk of a

implying that these grotesque Nazi medical exercises yielded results worthy of consideration and possibly of benefit to humanity. The present analysis clearly shows that nothing could be further from the truth, end quote. Basically, like, the author, I feel like is saying that if it's a question of using the data, first of all, the data is worthless scientifically. Right. But even if it was, you know, had, even if the experiments were done in a way, quote-unquote, experiments were done in a way that was controlled and all the variables, it doesn't mean that

it's okay to use. Yeah. But and also, and also on top of that, it's trash data. It's trashed. Yeah, it's just, yeah. So, yeah, there's, it is a really interesting paper. Yeah. So therapeutic hypothermia joins the ranks of so many other scientific advancements that have been built on the backs of those who did not have the power to say no or have their no heard. And hopefully it's somewhat of a consolation that overall, very few papers exploring the use of therapeutic hypothermia make reference to DACO, at least like directly from data. They may mention, this is where things, you know, this is what was done, but they don't say, and this is how we know. This is where we got our data. Right, right. And the therapy came crawling back slowly with,

a few papers here and there in the mid to late 1950s. First, the discovery by Hubert, Rosamoff, and Duncan Holliday that when a person is hypothermic, their brain consumes less oxygen. It was a major breakthrough. It opened the door for new avenues to protect the brain during times where oxygen might be restricted, like stroke, heart attack, aneurysm, certain surgeries. By just reducing the brain's oxygen demands with hypothermia, you're protecting the brain from long-term injury. And shortly after, a few physicians started playing around with using hypothermia after cardiac arrest. Others during cardiac surgery, although the routine use of therapeutic hypothermia wouldn't happen for a long time, especially as physicians grew aware and wary of certain

complications with the practice. In the 1950s and 1960s, again, the therapy was used in a few small studies for infants that had trouble breathing shortly after birth, like Apgar scores of one. This is our first hand to count. Animal studies had shown promise in this regard, so doctors tried it out on humans. And also it has a deeper history, like there are some reports from the 1600s using cold water immersion for infants. Interesting for infants. It seems successful. So when one of the studies, nine out of ten of the infants survived and none showed any developmental delay. And I couldn't find like any indication that the baby that did not survive died because of hypothermia. But I, yeah, I don't think that that was the case. But these studies were really small

and they weren't well controlled. And so combine that with the potential for complications and you've got another decades-long delay in this becoming a standard of care. Interesting. Yeah. And ultimately in 2005, I believe, it did become a routine and has since saved lives. and prevented injuries. But what about prolonging lives? So, someday, Erin, we should do an entire episode on cryonics. We should. As a teaser for now, let's just say that while researchers were trying to figure out how to use the cold to protect the body from injury,

other folks were wondering whether we could use hypothermia to put the body in a suspended state. The space race had begun after all. So, like, who was going to be the first to traverse light years' worth of distances? Exactly. So a bunch of cryonics companies sprung up in the 1960s with the first volunteer dying on January 12, 1967, which was a little bit earlier than the company that he had, the Life Extension Society, who was called, had thought that they were going to die. They were ready for?

Yeah, they were not ready at all. Like his doctor was like, he's on ice, you got to get him now. And they didn't have anything set up. They were still in building the pods or whatever. And so they stored this person in one of the Life Extension Society guys' garages in his station wagon. And then it was like, don't tell my wife. And then his wife went into the garage and was like, what? Get this out of here?

So we found a couple of friends who would store the body for a few days. But yeah, cry on. Sorry. All I can do is bling. Yeah. Sorry. This is a, this is a, just so I understand. Sure.

This was a person who died. Yes. Of some other cause, some cause. Cancer, yes, I believe. Cancer. And then they made him cold and stored him in a hatchback. There was some profusion of various substances. I forget what.

Got it. Yeah. It might have been DMSO. Sounds familiar. Yeah. Okay. In the 60s. In 1967, yeah.

Cool. Okay. But they didn't have the pods ready for like long-term storage. So the station wagon was. the thing. The first pod. Yeah. Okay.

Yep. But this came out, like the news of this came out, and Cryonix never quite recovered from this first mishap. And really just like over the years, it seems like a way to extort money from grieving people who don't know how to accept that their loved one died or that they themselves are mortal. Going to die. Yeah. So there you have it, Aaron. The history of cold. The good, the bad, and the weird. So can you tell me how therapeutic hypothermia works? Does it work? I love that that's what you're leaving me with. Yeah. I also have to tell you, I am not going to talk about cryonics at all. I didn't think so. That's

Okay. Literally as you were, like, as you were even starting, I was like, gosh, I wonder if I should have looked into like, I didn't. So if that's what you're expecting from this episode listeners, you're about to be disappointed. I'm going to talk about real life and not science fiction. Yeah. Maybe it will be science reality someday. Right now it's science fiction. I mean, wouldn't it be nice if we could wake up in the morning anyways? Is that a song? Beach boys. Oh. Wouldn't it be nice? Okay. Anyone who works long hours knows the routine. Wash, sanitize, repeat. By the end of the day, your hands feel like they've been through something. That's why O'Keeffe's working hands hand cream is such a relief. It's a concentrated hand cream that is specifically designed to relieve extremely dry, cracked hands

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Connecting homeowners with skilled pros for over 30 years. Angie, the one you trust, to find the ones you trust. Find pros for all your home projects at Angie.com. What I am going to actually focus on today, not cryonics, is how we use therapeutic hypothermia. I'm putting it in air quotes because we don't call it that anymore. Oh, what do we call it? There's been multiple evolutions of this term for a while. And it kind of depends on what scenario you're looking at.

So sometimes it still is induced hypothermia or therapeutic hypothermia. But more commonly, targeted temperature management is used. This might explain why I could find so few papers on the history of therapeutic hypothermia. Yes. Yes. It's why it took me so long to find. papers that I finally found about how we do it. It's because targeted temperature management and now, newly, just temperature control. Why the change in rhetoric, Erin? Let me tell you.

Oh. I'm going to tell you. But it's going to take me a while to get there because I'm verbose. And I'm going to focus mostly on the broad strokes of like what are the contexts in which we use therapeutic hypothermia, how do we do it and things like that. The point of it. Really big picture is what you mentioned, Aaron. It is to reduce the risk of ischemic injury, meaning reduce the risk that a lack of oxygen to our tissues causes actual and irreversible damage. Because of the theoretical fact, which is like it's not just theoretical, it is true, but because of the fact that as a our body temperature cools, our metabolic rate decreases, our need for oxygen in our tissues decreases. That is the theory by which therapeutic hypothermia works. But how does it end up working

in practice? Like, what is it really doing to protect our tissues? We think that in the brain, this decrease in our metabolic rate, decreases blood flow to the brain, which can also decrease intracranial pressure, which is something that often goes up during damage. In our heart, because of changes to the heart muscle and the heart tissues itself, as well as the changes that we see in our blood vessels with cold, right, we're vaso-constricting a lot of, out of our blood vessels. Yep. We see a decrease in our heart rate, but you can maintain blood pressure to a certain degree.

Okay. And these are two of our organs, our heart and our brain, that we are wanting to protect the most with therapeutic hypothermia. Because our heart and our brain are two organs that, A, are going to be impacted first due to ischemic damage, right? Lack of oxygen is going to end up damaging those tissues irrevocably. And if we can protect those, then we can potentially recover from any other insult to other organs or other tissues. So we're still in the hypothetical.

This is how things should work. The thought of how this should go and why we think that cooling a body, a core temperature, is going to be beneficial. official. Okay. Got it. So to understand the specific situations where we might use therapeutic hypothermia or targeted temperature management or whatever, we also have to think about the ways in which this lack of oxygen ends up causing damage. Okay. Because what that tells us is there's different time periods at which you could potentially use hypothermia to try and reverse or prevent this damage. Right. So tell, yeah, elaborate.

Okay. Let me elaborate. And we can use, if we want, we can use an example. Let's say your heart stops. Okay. Okay. This is one possible situation. If your heart stops beating, you're not pumping blood.

So your tissues are not going to get oxygen. That's all of your tissues. brain, your heart, all of your tissues are going to not get oxygen. There's three phases to the damage that that is going to cause. The first is when that heart stops, you're going to have the lack of oxygen, right? Because our cells require oxygen for metabolism, without oxygen, your cells start to become damaged. Okay? Step one. But then if we are in medicine and we're like trying to bring somebody back and you can restart their heart after a cardiac arrest, you're going to all of a sudden re-perfuse that area.

Yep. Okay? Which means you're going to have a flow of oxygen to the area. You're doing CPR. You're using a defibrillator. Whatever it is, you're now reprofusing. That process actually causes its own sort of damage. because as our cells start working again,

they end up creating reactive oxygen species. The way that I think of it is like, you know if you turn your water off in your house for a while? Yeah. And then when you turn it back on, it's like grody, like sputtery and like brown water at first before it runs clear. Mm-hmm.

Thank you. That's my analogy. That's like the immediate reperfusion injury that you can get. Okay. Okay. Okay. And then after that, there's a final stage that you can also get like a delayed reperfusion injury. Think of it like a few hours after you start to get blood flow back.

There's inflammation. There's our body reacting to this insult that it just received. So you can get additional damage to that time as well. I don't have a synch analogy. How does that? What about pipes in the house water? It doesn't. Yeah, it doesn't.

I don't have a equivalent there. Sorry. Okay. Okay. Okay. Okay. So that's the example with cardiac arrest, but it's true in any scenario where you are, have a lack of blood flow, right? If you think of a stroke, all of those same scenarios are going to happen. You have blocking blood flow to a part of the brain that causes tissue damage in the brain. Then if you're able to repurpose that area by, say, breaking up that clot or something like that, you're going to get reperfusion injury. And then you'll have delayed repufusion injury as well. So it is, that's the like ways that damage are caused. So you could potentially, in theory, use hypothermia at any of those stages to decrease the risk of injury depending on when you can initiate it, how long you

initiate it for. Because in addition to decreasing our overall metabolism, this hypothermia also just like attenuates all of our cellular responses. It's going to reduce the influxing. inflammatory response. You'll have vasoconstriction, so you're not going to have as much edema or fluid like collection outside of our vascular system. And there is a lot of animal data to support the use of therapeutic hypothermia in a really wide variety of situations. Okay. Real quick, though. So if someone has their heart stops, then there already will be damage because of the reperfusion and then the second repufusion situation, whatever. So then when is hypothermia, when do you target the use of hypothermia?

And also how realistic is that from like a hospital situation? So that is why this gets so complicated. Okay. Right? Because that's the exact right question. But if you think about the survival story that you. told last episode, Aaron. Oh, because her heart had just stopped.

Her heart stopped, right? But she was already cold at that point. Yes. She was cold and her heart stopped because of that cold. Right. So there was already a decrease. So you potentially, in that case, because she recovered so well, you already had protection against anoxic injury.

You had protection against lack of oxygen because the tissues were already cold before that initial insult, right? In most realistic scenarios, that's not going to happen, right? Yeah. So the cases that we are going to potentially be able to use therapeutic hypothermia, we're probably not going to be able to do it before that initial injury, before the onset of the lack of oxygen. Okay? So it's the second two scenarios that we're thinking about targeting. Can we use it to reduce the risk of that initial reperfusion injury? Well, to do that, you would have to cool the body before you re-perfuse it. Right.

Right. Okay. So before you restart the heart, that's not a thing that people do. Because if someone's heart stops, your first thought is to restart it. Restart it, yeah. Right? So the way that therapeutic hypothermia or the way that targeted temperature management often ends up being used is in that third phase to try and reduce the risk of that delayed

repofusion injury. Okay. After the heart or whatever it is gets restarted or things like that, can we delay, can we reduce the risk of that further damage by cooling the body, slowing down the metabolism, slowing down the need for oxygen? Does that make sense? It does. And so like, because I feel like there are two main, well, I mean, obviously you're going to

tell me more, but like in an emergency situation, there's, it's like the use of therapeutic hypothermia or whatever we're good temperature control yeah whatever yeah um the thermostat in uh an emergency situation and like uh we need to decide right now what do we do versus a we're going into surgery type of situation like is that you know like a more planned right use so so when do we when do we actually use it right yeah what are the situations that we actually use it today and do we have data that it's actually helpful because that was all like the theory of like this is how it should work should be able to use it in these scenarios. Can we actually use it in these scenarios?

Surgeries. So in a surgical situation, you could, because you're in total control there, you could cool the body before any kind of eschemic insult, right? Yeah. You can do that. And if we are talking about a heart surgery, you might need to actually stop the heart in order to do a surgery on the heart, right? in those situations, a person is put on cardiopulmonary bypass.

So their blood is still being pumped. It's being oxygenated outside of the body. But could we, by reducing their body temperature, also decrease the risk that if we're not oxygenating it quite well enough or just, you know, that the heart itself, which is stopped, it's not going to be as injured. That is something that is sometimes used. But there is much more mixed data on whether or not it's true. truly protective, both for like neuroprotection as well as just like generally protective

against ischemia. And so right now the guidelines for, you know, if someone is doing a heart surgery and is going to be on cardiopulmonary bypass, do you do intentional hypothermia or do you not? It depends on the situation. And like in what way? It might depend on that particular person. How high of risk are they for ischemia to begin with? It might depend on the capabilities of where you're doing the surgery. Do you have the ability to cool somebody or not? But the data is not like a clear cut. Like you need to do it in order to improve outcomes. And it's okay if you don't do it, essentially. In most other surgeries, the data is more clear that hypothermia should actually be avoided. Okay. Because your body is going to be under more stress trying

to warm itself up, and surgery is already a very stressful situation. So it's really only, like, heart surgeries. There also was, like, there's been trials on using it for brain surgeries, especially, like, aneurysm clips and things like that. There's not really data that hypothermia is beneficial necessarily in those scenarios. It's so interesting because I feel like, I mean, and maybe this just speaks to the papers that I found that were, you know, out of date. But how so many how it is talked about in terms of like this is a really promising thing it's case by case but like it does it does really work and I think also just the fact it's the human body like we we have these controls these these are our homeostasis or whatever we're trying to maintain

temperature for our benefit even if that does end up hurting us and so I see yeah causing more stress by trying to override those controls That makes sense. Yeah. Yeah. So that's really, from what I could find at least, that's the only scenario where if you could do therapeutic hypothermia, you would be trying to prevent that initial injury. Everything else that we use it for is kind of post injury. Can we prevent, you know, worse sequelae?

When it comes to neurologic stuff, because there's a lot of interest in, like, protecting our brain using hypothermia, the data is much more mixed and not. as strong as I kind of expected. So after stroke, after traumatic brain injury, after, you know, hemorrhagic aneurism or aneurism rupture, any of these things, the data is unclear. And guidelines right now do not support universal therapeutic hypothermia. Okay. They do support avoiding fever. And that is part of why, and I'll get into it even more, but that is part of why the

kind of naming of this has changed more to let's not think as much about you know intentionally cooling the body but to like a degree lower than a typical body temperature of 37 but let us do make sure that we don't go above 37.5 because then we do see that there's more damage that makes sense yeah what about babies okay I was going to talk about cardiac arrest next okay you can do Oh, I love it. Those are the two big areas. So that's all the things that like we maybe sometimes kind of use it for. There's two areas that at least for a while, oh, spoilers, this therapeutic hypothermia

actually cooling the body to around 32, 33, 34 degrees. So mild hypothermia was considered standard of care for almost 20 years for out of hospital cardiac arrest. Okay. So if somebody heart stops outside of the hospital and you're doing CPR or you have access to a defibrillator and they have a shockable rhythm so you can defibrillate them, there was a big paper that came out in 2002 that showed big benefit to once you get circulation back, once you have Rosk, which is return of spontaneous circulation, once you bring that person back to life. if you cool them for at least 24 hours, I think it was 12 to 24 hours at first, you have improved outcomes, better survival. Okay, survival as the outcome. Got it? Survival is the outcome because that's, yeah. And so that became standard of care.

And then there was other papers that came out later that showed even if the person initially did not have a shockable rhythm, meaning if their heart stopped, but it was because of other things. it could be because of substance use. It could be because of a pulmonary issue. It could be like just so many different things, but their initial rhythm wasn't one that you could defibrillate like they do on ER. Uh-huh. Yep. They've moved past the clink, clink of the paddles.

Yeah. That's good. Yeah. But so there were other papers that came out in like the early 2000s that showed even in those situations there was some benefit to therapeutic hypothermia. So that was the standard of care. However, since very recently, like a paper came out in 2021 that looked at a pretty big swath of people, regardless of their initial rhythm, out of hospital cardiac arrest, and did not find that therapeutic hypothermia was beneficial compared to just ensuring that they don't have a fever. So targeting 37.5 and not allowing it to go higher than that, but not necessarily lowering it wasn't any more beneficial.

There were a couple of other papers that came out since then that were similar that kind of just showed maybe this, because there were papers that looked at, okay, well, if lowering the body temperature is beneficial, what's the ideal temperature? Is it 32? Is it 33? Could it be 36? How low do we need to go? Right. And those papers found that like 36 and 33, eh, no big difference. And so that led to more and more of these papers looking at how cold do we need to get people to have a benefit to try and keep them alive with minimal neurologic damage once we bring them back after their heart stops. Okay. So this is once you bring them back after their heart stops, administer therapeutic hypothermia, but you don't anymore. It's just to make sure they don't have a fever.

So right now, as of 2023, the guidelines is to pick a temperature somewhere between 32 and 37.5 and keep them there. So temperature control, but not necessarily therapeutic hypothermia. I have a question. How do we do that? Oh, such a good question. There's a lot of different ways. It all does have to be very tightly monitored. especially during the induction and maintenance phase.

So as you're cooling that body down and then once you get to that temperature that you're targeting, one of the things you have to do is avoid shivering, right? Because that's an automatic response that's going to rewarm the body and increase metabolic demand. You also have to keep very close eye on like their blood counts, making sure that all of the things that can go wrong during hypothermia, getting increased blood clotting, electrolyte abnormalities, diureciseus, acid basis, disorders from things shifting in and out of cells. You have to monitor all of those things.

But how do you actually do it? You can do it almost the opposite of how we can warm your body. So you can externally cool with like water baths or these fancy gel pads that like circulate temperature controlled water. You can do internal cooling like the opposite of what we would do to warm it up. You can infuse cold IV fluids or cold like peritoneal or lavage. That must be weird. I know.

you can also do have you ever donated plasma? Mm-mm. Only blood. If you ever donate plasma, they take our. They recirculate, yeah. Yeah, and so when it goes back into you, it is a little, it's not cooled, but it is just colder than your body temperature usually, and it does. It makes you feel cold. But you can also do that.

You can do extra corporeal blood cooling, so you can take someone's blood out, cool it down, and then and then infuse it back in. So there's a number of different ways. And like I mentioned, it's usually a very mild hypothera, that is targeted. So like 32 to 34 degrees Celsius. Right. Okay. Fascinating.

Okay. I know. And then there is babies. You asked, Erin. And this is the area that I think therapeutic hypothermia is truly still the correct term because it is the area that is still used. Okay. Whole body cooling or sometimes just head cooling. so just cooling of the head is used and is considered standard of care for full-term newborns

that are born and suspected of having hypoxic ischemic encephalopathy or H-I-E. And this is suspected brain damage that's due to lack of oxygen to the brain in a newborn. Okay. And that can happen. I'm not going to go into a lot of deep detail on this because I think it deserves its whole own episode. But this can happen in like a variety of different contexts, either just before delivery or kind of during delivery or shortly after delivery, right? Okay. Yeah. There's a lot of situations, whether it's placental abruption, when like the placenta comes off of the uterus before the baby is

delivered, that is going to disrupt oxygen flow to the fetus. Other cord issues, like the cord getting compressed or prolapsing, uterine rupture, the heart rate of the fetus just dropping and then not recovering, or even during or after delivery, anything that causes the baby to stop breathing or not have access to oxygen is going to lead to potentially hypoxic ischemic encephalopathy. And we use that APGAR score that you mentioned, which is a composite score of like how well they're breathing, their skin color, turgur, reflexes, all of these things to give a sense of how a baby is doing. And it's usually at that 10 minute mark if a baby's heart rate is still really low or if it's not there at all.

And if they're not breathing or they're requiring continued ventilation support, there is good data that cooling these babies can help prevent severe disability or death. Okay. And I specifically mentioned full term infants. Yes. Because a relatively recent study from, I think it was actually published this year in 2025, was actually one of the first ones that looked at preterm infants and did not find any statistically significant improvement in outcomes for preterm infants by using therapeutic hypothermia. Why do you think that is? I mean, babies, newborn babies are so different.

in their physiology. And so, like, a premature newborn has different physiology than a non-premature, like a full-term newborn. And so we don't know. I mean, the short answer is we just don't know. But that's why it was so important that this study was actually done because there certainly were, all of the studies previously had only used full-term infants. And yet therapeutic hypothermia, I think, was often maybe used in some situations in preterm infants just based on the data. of full-term infants, right? But because we know they're so different,

it was important that this data actually came out and it doesn't show improvement in outcome. Okay. And what is like the effect size, I guess, or like what, you know? It's a good question. A meta-analysis from 2021 found for full-term infants a pooled reduction in risk of mortality

of about 26% in infants who are cooled compared to ones who weren't. And this was similar, whether it was whole body cooling or just head cooling that was used. Okay. Yeah. So it's not nothing. It's not nothing. And it's pretty amazing that, yeah, that there is, I don't know, there are uses for this because it does seem like fairly, I know,

it's not straightforward that there are many different approaches that you can use to do this and administer this and monitor this and that it's about the degree and all this stuff. But it's like, it's just, I don't know, it's, it's fascinating to me that it's like we use temperature in this way. Also, what you had mentioned, Aaron, about the use in cancer is so interesting because I didn't find anything about it's, I mean, I know, you know, people do sometimes like ice on the head to try and reduce hair loss during chemotherapy or things like that. The mechanism, that's going to be very different than what you had mentioned, but someone using it to try and reduce cancer growth. I think probably because we have better options today is why there's not really a lot of data that I could find at least on modern uses of that. We do use a different kind of cryotherapy like liquid nitrogen to kill small skin cancers or other growths all the time. I love that you mention that.

That's funny. Yeah, I forgot about that after the fact. I also did find a paper on cold plunges and that kind of crowd therapy for muscle recovery after workout. By the way, there's not really good data to support it, but I can give you a paper if you want to read about it. Well, and you know, I'm not against cold plunges. If you enjoy jumping into an icy lake or a tub or whatever, do it, do it safely. Have a buddy. Whatever. You know. No. But there's not like for like the muscle recovery stuff. Like you, there's not a lot of data that it's really beneficial. But you can read about it. If you want to know more, we have so many sources for you. We do. Okay. Again, I'm going to show. shout out that book by Phil Jekyll called Out Cold, Chilling Descent into the Macabre,

Controversial, Life Saving History of Hypothermia, and then a paper about Dr. Temple Faye called Breaking the Thermal Barrier, Dr. Temple Faye, by Al Zaga at all from 2006, and then by Gunn from 2017, therapeutic hypothermia translates from ancient history into practice. And more papers. I had a couple of older papers, one from 2014, that old, but called Clinical Applications of Targeted Temperature Management by Perman at all. And another one from 2008 that was just called Therapeutic Hypothermia by Varon and Acosta. And then the two papers, two biggest papers that I had on hypothermia in infants, one of them is whole body hypothermia for neonatal encephalopon. the in preterm infants 33 to 35 weeks in JAMA Pediatrics. And the other one was from Plus

1. And it was that 2021 paper that was the systematic review and med analysis. But then what's fun is I have guidelines. So many of the guidelines. Like the 2002 paper that led to the guidelines initially of being yes, do therapeutic hypothermia for out of hospital cardiac arrest. And then all the subsequent papers that were like, yes, it's beneficial. No wait. Maybe it isn't. Maybe it's not as good as we thought. Now here are the new guidelines. So many guideline papers. You can find them all on our website. This podcast will kill you.com. You can. Thank you to Bloodmobile for providing the music for this episode and all of our episodes. And thank you to Leanna and Tom and Brent and Pete and Jessica and Mike and everyone else at exactly right network for all that you do.

Thank you. Thank you. And thank you to you listeners and watchers and anyone who enjoys this podcast in any way. It means the world to us. And as does the support of our patrons. Thank you. Thank you. Thank you. Thank you. Well, until next time, wash your hands. You filthy animals. A little out there. Into the big heart of Nevada. Or you can go off road and off the map. On two lakes or on horseback.

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