Fast Push #5 - TCCC Tourniquet Update

Forty to seventy-five percent of tourniquets placed in the field are never actually needed. In Ukraine, tourniquets left on too long during delayed evacuations have cost people limbs that the original wound never would have.

This fast push covers the new May 2026 TCCC Guidelines update and two CoTCCC training briefs on tourniquets, built around lessons from prolonged evacuations in the Russo-Ukrainian war. Topics: telling truly life-threatening bleeding from bleeding that just looks bad, the case of an 11.5-hour tourniquet that cost an arm, reassessment moving from a medic-only skill to something every responder needs, the six options at reassessment (remove, convert, reposition, tighten, add a second, leave alone), how to convert a tourniquet, and what changes once one's been on past six hours.

Takeaway: applying a tourniquet is the easy part. Knowing what to do with it for the next several hours is what actually saves the limb.

References:

Committee on Tactical Combat Casualty Care. TCCC Guidelines, 01 May 2026. https://deployedmedicine.com/tccc Full guidelines PDF: https://learning-media.allogy.com/api/v1/pdf/18ccfdfc-a076-47e9-8a34-376efdd81b43/contents

Butler F, Holcomb J, Dorlac W. TCCC Quick-Look: What Kind of Bleeding Requires a Tourniquet? 19 May 2026. https://www.aast.org/static/dadfd895-d295-4a5d-9f45f8d92940991c/TCCC-260521-TCCC-Quick-Look-Who-Needs-a-Tourniquet.pdf

Koch EJ, Andersen M, Barbee GA, et al. Standardizing Tourniquet Reassessment and Conversion Across TCCC Tiers: TCCC Guidelines Proposed Change 25-2. J Spec Oper Med. 2026;26(1):M4V1-O3Y7. This is the peer-reviewed paper behind the Tourniquet Reassessment Quick-Look. https://jsomonline.org/product/standardizing-tourniquet-reassessment-and-conversion-across-tccc-tiers-tccc-guidelines-proposed-change-25-2/ PubMed: https://pubmed.ncbi.nlm.nih.gov/41818038/

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Transcript

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00:00:06 Patrick Fink: Your search and rescue teams. Pager goes off. A Hunter solo off trail three miles and up a drainage. Went through a gap and blow down timber and a broken branch caught him deep across the thigh. The report is of a deep laceration and serious bleeding. He applied a tourniquet before he got to light, headed to manage it, and then triggered his satellite messenger. Your SA team gears up and starts hiking in. By the time you reach him, about ninety minutes have passed since the injury. He's alert, a little pale, and the tourniquet is cinched high on his thigh, bleeding controlled. But you're still three miles from the trailhead. It's getting dark and the carry out is going to take hours before he's anywhere near a hospital. So here's the real question for today. What do you do with that tourniquet between here and the trailhead? Because it turns out the answer to that question has changed. And if we get this one right, we can avoid losing some limbs. Hello and welcome back to Wilderness Medicine Updates, the show for providers at the edges.

00:01:01 Patrick Fink: I'm your host, Doctor Patrick Fink. Today I'm doing a fast push. I'm recording live from the banks of the rogue River, about to head out into the wilderness myself for several days, but I wanted to get a short episode out to you. This fast push is the format where I take something fresh and practically important and get it in front of you quickly without a full, deep dive episode around it. This one is worth moving quickly on because it just changed, and it applies to anyone who might ever have to control life threatening bleeding somewhere that's more than a couple hours from help. Here's what's driving this episode. The Committee on Tactical Combat Casualty Care, or triple C, which is the group that sets the standard for battlefield trauma care and whose guidance trickles down into basically all modern pre-hospital bleeding control. Put out an updated version of their guidelines on the first of May this year. Alongside that, they've released two short training briefs that they call Quick Looks, specifically on tourniquets, one on who actually needs one, and one on what to do with it after it's on. Both are built heavily around the hard lessons that were learned in the war in Ukraine, where evacuation times have been very different from what modern military medicine has expected for the last twenty years. And I want to be up front about why a combat casualty care update belongs on a wilderness medicine show. It's the exact same underlying problem that we deal with constantly. What do you do with a life saving intervention when definitive care is hours away instead of minutes? Ukraine has produced a really uncomfortable answer, and it applies to you just as much in a hunting accident, in a drainage, a ski patrol, extraction, a search and rescue carryout, as it does on a battlefield. So let's get into it.

00:02:47 Patrick Fink: A quick bit of framing for the last couple decades, the guiding message on tourniquets was pretty simple. If there's life threatening bleeding, put one on. Don't hesitate and don't worry too much about it. Because in Iraq and Afghanistan, casualties usually reached a surgeon within an hour or two. On a forward operating base or forward medical position. And a tourniquet on for that short window is very safe. Ukraine broke that assumption. Evacuation there has frequently been delayed for many hours, sometimes because of the tactical situation, like drone threats overhead and sometimes just distance to infrastructure. And so the committee for T, triple C is now explicit that this isn't a Ukraine only problem. They list naval surface combat, urban conflict, amphibious operations, mass casualty events, and rural civilian settings as other places where you can't assume a rapid evacuation. And that last one is on us as well. That's exactly your situation if you're on a river trip, a remote ski tour, or three miles up a drainage, getting ready to do a SAR carry out. So the new guidance is really doing two things at one time, tightening up who actually needs a tourniquet in the first place, and being more deliberate about what happens to that tourniquet over the following hours. Let's jump in in that order. First, not every wound has to have a tourniquet. Here's a finding that should make us a little uncomfortable. Multiple studies cited in the new material found that somewhere between forty and seventy five percent of prehospital tourniquets placed in the field turn out on reassessment to not have been medically necessary. That's the majority in some of these data sets. Now, I question this a little bit because just because there isn't bleeding when you take off a tourniquet, doesn't mean that there wasn't when you put one on. But let's just take this broad strokes. A number of tourniquets that are placed in the field are probably unnecessary. And the underlying message from triple C is pretty blunt.

00:04:42 Patrick Fink: The presence of a wound on an arm or a leg does not by itself mean that that limb needs a tourniquet. A lot of wounds bleed dramatically for a moment and then aren't actually life threatening. Some venous oozing or laceration that looks alarming in the moment, but flows with direct pressure. Tourniquets are for life threatening bleeding, not for bleeding. That just looks scary.

00:05:04 Patrick Fink: So how do you tell the difference? The framework that they teach is a short checklist, and it's worth putting into your brain. So first, blood that is spurting, pulsing, or flowing out steadily instead of just oozing blood that's actually pooling on the ground, clothing that is soaked through with blood, a dressing or an improvised bandage that you've applied and it's still getting soaked through despite your pressure or a traumatic amputation. And lastly, one that's easy to miss. a patient who has bled significantly earlier and is now showing signs of shock like altered mental status, pallor. Weakness. Rapid pulse. Even if the bleeding in front of you is slower, those patients maybe have lost a little too much blood to be bleeding dramatically, but they really need to keep what they have. So if you're seeing one of those things, those are genuinely life threatening bleeding, and a tourniquet is the right call immediately, without hesitation. If what you're looking at is a wound that's bleeding but doesn't meet that bar, direct pressure and a good dressing is very likely the better tool. And I'll flag one nuance for the truly dangerous moment. If you or your patient are under direct threat, what T triple C calls care under fire, the calculus shifts. You don't have the luxury of a careful exam. So the guidance there is to apply the tourniquet over the clothing high and tight and sort it out later when you're in a safer spot. And this is something you can consider in the wilderness as well. If you're not in a safe position and you need to move that patient fast. It's not the time to do a nuanced exam. Throw on a tourniquet if you think it's necessary and get moving. You can reassess.

00:06:43 Patrick Fink: So why do we care so much about which bleeding actually needs a tourniquet? That's the whole point of this episode. A tourniquet is not really a free action. Once you're looking at a long evacuation, it starts to have a cost. And that cost is what was learned in Ukraine. Here's the piece that I think should stick with you. Tourniquet is applied correctly for genuinely life threatening. Bleeding are very safe for about two hours. That's well established. And it's why the don't hesitate message was correct for so long. In a system where surgical care was usually reachable inside that window. And that still applies if you're within reach of EMS and you're near to a hospital. But the T triple C material introduces a case out of Ukraine that illustrates what happens when that evacuation window blows wide open. A casualty had what turned out to be a fairly minor fragment injury to the forearm. It was soft tissue, nothing catastrophic, and a tourniquet was applied. But evacuation was delayed and that tourniquet stayed on for eleven and a half hours. By the time that patient reached care, the arm was cold, there was no pulse, no sensation. It had to be amputated, not because of the original wound, but because of the tourniquet time. And that's where I want this to sit with you, is that the injury was minor, and the tourniquet is what ultimately cost the limb. So triple C is pretty direct about a broader pattern. When evacuations are prolonged, tourniquets that are left on longer than necessary, are causing genuinely unnecessary amputations, kidney injury from muscle breakdown in an ischemic limb and, in some cases, even death in patients whose original wounds might not have warranted a tourniquet in the first place. So the lesson here isn't don't use tourniquets. They still call them the most reliable way to stop life threatening limb bleeding. And they are definitely responsible for saving thousands of lives in Iraq, Afghanistan, and elsewhere. The more important lesson is that the tourniquet is a temporary bridge, not a set it and forget it fix. And the moment that your evacuation timeline stretches beyond that safe window of two hours, the tourniquet itself becomes the potential for a second injury that you need to actively manage. So now what do we do? What did T triple C tell us to do with tourniquets? What has actually changed? The big shift is around who's responsible for assessing a tourniquet and how soon. In the past, triple C guidance leaned on the idea that a medic or someone with more advanced training would be the one to reassess and manage a tourniquet over time. That made sense when medics were reliably available, but they recognized here that and this is on the nose for anyone doing wilderness or disaster medicine, that there might not be a medic available at all. Someone has to manage that tourniquet. So triple C added tourniquet reassessment as a skill that should be expected of any combat lifesaver or any combatant, not just designated medical personnel. If we were to extrapolate this to a more civilian context, I think it's reasonable to say that Basically, anyone who potentially might apply a tourniquet needs to have the skill of being able to perform a reassessment. This is not an advanced specialist only skill. It's a basic skill that anyone applying a tourniquet needs. Your hunting partner, a raft guide, a ski patroller even if you're not the medical lead. The timing rule is simple to remember. Reassess the tourniquet as soon as it's safely and practically feasible, but no later than two hours after you applied it. And the reason that that matters over time isn't just the clock. A wound that seemed to need a tourniquet at one minute can genuinely change by hour one. Muscles relax. The tourniquet itself can loosen. Vessels will spasm down to prevent bleeding. The patient moves. Fluid resuscitation changes how your patient's physiology is operating, so the need for that tourniquet isn't a fixed fact moving forward. It's something that you need to re-evaluate and check. So how do you reassess a tourniquet? There's six possible things you can do at that time. First, remove it. If you expose the wound. Loosen the tourniquet, and the bleeding that happens is not actually significant. You can take it off. This directly addresses that forty to seventy five percent problem. A real fraction of tourniquets turn out after careful look. Not to be needed at all, or I would say not to be needed after their initial period of application. Personally, if it's me doing a carryout and I have a tourniquet on and I release it and it seems to result in reasonable bleeding, I'm going to leave that tourniquet in place. I'm just not going to have it ratcheted down. That way, if I reevaluate later and bleeding has resumed, I can easily reapply it. Two you can convert the tourniquet. If loosening the tourniquet causes bleeding, that's real and potentially life threatening, but you judge that the tourniquet needs to come off because it seems like it's causing tissue damage. You can try to control the bleeding another way, like with direct pressure, a hemostatic dressing, a pressure bandage, you convert it to a different bandage. We'll talk about the mechanics of that in a minute because it's what most people have in practice. Third, you can reposition the tourniquet. Sometimes the tourniquet is still genuinely needed, but it was placed higher up the limb than necessary. Maybe it went on high and tight in a rush in an unsafe situation, but now you can reevaluate. You can apply a second tourniquet directly against the skin, just two to three inches above the actual bleeding site, and then slowly loosen the original over about a minute. This can reduce the amount of tissue that's being deprived of blood flow without ever leaving the limb unprotected. The fourth thing you can do with a tourniquet is tighten it. So if you go to reevaluate that tourniquet and there's still meaningful bleeding, crank it down and make sure you can't feel a pulse beneath the tourniquet. It's not actually doing its job. Fifth, if you tighten that thing and it's not doing what it needs to do, you can add a second tourniquet. So if you've maxed out the first one and they're still bleeding or a palpable pulse, place a second tourniquet side by side with the first more proximally. And last, our sixth maneuver. You can leave that tourniquet alone. Sometimes the right move is to do nothing. That's the call. If the bleeding is controlled and you expect to reach a treatment facility within two hours of when it went on. Also, if there's a traumatic amputation just below the tourniquet, i.e. there's nothing meaningful left to save below the tourniquet, or if that patient is in shock and is at risk of further deterioration, then just leave it on. Also, if you come on a scene and there is a tourniquet that has been in place for six or more hours, leave that one on too, and we'll talk about that in a second. So that's your decision tree in the scenario in the open, your three miles from the truck with a thigh laceration, depending on what you find when you actually re-examine that wound, any one of these six could be the right call. If you go to reevaluate it and you think, actually, we're going to have a helicopter here in, you know, fifteen minutes and this patient's going to be hospital to hospital in thirty minutes, you can leave that tourniquet on. They'll be there within two hours. If not, we might think about reevaluating it. Is it in such a position where we could move it lower and have less tissue tourniquet when we take it down to reposition it or reevaluate it? Is there significant bleeding? If there's not, fantastic, we're done. If there is still some significant bleeding, could we control that bleeding another way? If there's not, we continue to use the tourniquet. And if that tourniquet isn't sufficient, we're going to tighten it or apply a second. That's really all there is to it.

00:14:21 Patrick Fink: Let's talk briefly about how to convert a tourniquet, since conversion is the option that most directly prevents Ukraine style limb loss outcomes during long term transports. It's worth knowing the mechanics of this even briefly. So first, expose the wound fully. Then pack that wound cavity tightly with a hemostatic dressing if you have one, or clean, dry, dry gauze material. If you don't. Maintaining firm direct pressure. Hold manual pressure on that wound surface for at least three minutes, and then apply a pressure bandage snugly over the wound, and only then do you slowly release the tourniquet over about a minute, watching closely the entire time for any return of bleeding. If you start having uncontrolled bleeding again, you're prepared to retighten the original tourniquet immediately. So we're applying firm direct pressure with packed gauze, hemostatic gauze if you have it, and applying a pressure dressing over the top and only then opening the faucet.

00:15:28 Patrick Fink: Before we wrap up, let's talk about that situation where if you show up on scene and there's already a tourniquet on and it's been on for way too long, if the tourniquet has been on somewhere in the two to six hour range, the guidance from T triple C is that you should seek medical direction, call online medical control, and have folks help you make a decision about what to do with that tourniquet. But if the tourniquet has been on for more than six hours, their instruction is unambiguous. Don't try to take it off, convert it, or reposition it on your own, because at that time, the the limb is already compromised, and a limb that has been ischemic or without blood flow for that time can carry some real risk. If we reperfuse that tissue and open up that tourniquet, it can dump things like potassium into the central circulation and cause problems for the patient. So that is a decision that belongs with advanced medical personnel and probably in a definitive care facility. So leave that tourniquet on if it's been on for longer than six hours and get medical direction and keep moving towards that definitive care.

00:16:40 Patrick Fink: let's wrap up by going back to the Hunter and the drainage. He did the important thing right on his own before you ever got there. He recognized that he had real life threatening bleeding and put on a tourniquet. Now it's your team's turn to manage that tourniquet for the rest of the carry out. And his clock already has ninety minutes on it. So your first move right then and there before you start moving him is just to reassess it. Expose it. Look at it. If it's not bleeding much, when you ease off the tourniquet, take the tourniquet off. If it's still bleeding seriously, but you're confident that you can control it with packing in a pressure bandage, then convert it and watch that dressing like a hawk for the carry out. If it's still bleeding hard when you take the tourniquet down, or you're just not confident about controlling it on a three mile carry out in the dark, then tighten it back down and leave it. And keep counting on the clock. Because if total tourniquet time is closing up on six hours, you really want to move him quickly towards definitive medical care.

00:17:36 Patrick Fink: Here's a quick summary. Since this was a fast push one. Not every bleeding wound needs a tourniquet. Reserve it for genuinely life threatening bleeding using that checklist of spurting or pooling blood soaked dressings. Amputation or shock. Two. A tourniquet is super safe for about two hours, but Ukraine has shown us that beyond that window, unmanaged, it can cost a limb when the original injury never would have. Three. Reassessment is not a specialist task. Only anyone who applies a tourniquet needs to know how to reassess it within two hours, if at all possible. Four. A reassessment you have six moves remove, convert, reposition, tighten, double up or leave it alone. And conversion succeeds more often than you'd think. And five past six hours. Don't adjust it. Get medical direction and hustle on to definitive care.

00:18:28 Patrick Fink: That's it for the fast push on tourniquet reassessment. If there's one sentence to carry around in the woods with you, it's this. Applying the tourniquet is the easy part. Knowing what to do with it for the next several hours is actually what determines whether that limb makes it out intact. If this episode was useful, please share it with someone who carries a tourniquet in their kit. Your hunting partner, a ski patroller, search and rescue teammate, a wilderness EMT. And if you've got a second, a five star rating on Apple Podcasts or Spotify genuinely helps more people connect with the show. If you have questions or topics that you want covered, email me at Wilderness Medicine updates at gmail dot com. I read all the mail and I do eventually get back to you. Until next time. This is your host, Doctor Patrick Fink. Stay fit, stay focused, and have fun.