Wound Packing: It's Not Just About the Gauze

This piece is for anyone who has taken a bleeding control class and been taught to pack a wound without being told what the packing is actually doing. It is also for providers who pack wounds regularly and have never had a clear explanation of why one hemostatic agent is chosen over another. The mechanism is the same for both audiences. The depth is what changes.

Think about a leak in a garden hose. You can keep putting towels on it. The towels soak through, you put on more towels, and those soak through too. The water is still coming out at the same rate it was before you started. Nothing about laying material on a leak stops the leak. The only thing that stops it is pressure. Put your thumb on the hole and the water stops.

That is what packing a wound is for, and it is not what the gauze is usually described as doing. Bleeding control courses teach the steps well. Stuff gauze into the wound, push it in tight, hold pressure. Every part of that is correct. What often gets left out is the reason, and the reason is the part that tells you how hard to pack, how deep to go, and how long to hold. Gauze is not absorbent material you are using to soak up blood. Blood loss is not a spill to clean up. The bleeding vessel needs to be compressed, and the gauze is how you reach it.

Why you cannot just push on it

With a hose, you can get a thumb on the leak. With a deep wound, you cannot. The bleeding vessel might be two or three inches down inside the thigh, and your hand stops at the skin. Pressing on the surface squeezes tissue that is not bleeding while the vessel underneath keeps pumping into the space you cannot reach.

Packing solves that. You fill the wound cavity with gauze, firmly enough that it is packed solid, and then you press down on top of it. The gauze transmits your pressure down into the wound and onto the vessel. You have effectively extended your thumb to a leak your hand could never get to.

The gauze is not the treatment. The gauze is how your pressure reaches the vessel.

This is also why loose packing fails. Empty space in the wound allows blood to keep accumulating and reduces the tamponade the packing creates. The goal is to fill the cavity firmly enough that the material stays in contact with the bleeding tissue while you apply pressure from outside. A wound packed loosely is closer to doing nothing than it is to doing it correctly.

It is also why packing hurts. You are pushing material firmly into an open wound on a conscious person. A patient who is awake will react strongly. Pain by itself does not mean you are doing it wrong, and it does not tell you whether the bleeding has stopped. The endpoint is hemorrhage control, not the patient's pain response.

Does a tampon work for a gunshot wound?

No, and the reason is the same mechanism. The tampon myth has been circulating for years, and it pains me that it STILL comes up in 2026 despite the facts. It shows up in improvised kit lists, in movies, and in advice people give each other online. The logic behind it is that a tampon is designed to absorb blood, so it should work on a bleeding wound. In my experience, the people most committed to this idea also tend to be men, which may explain some of the confusion about what a tampon is actually designed to do.

Absorption is not the goal. A tampon absorbs, expands to its own fixed shape, and stops. It does not conform to a wound tract, it does not fill a cavity of unpredictable shape, and it cannot be packed firmly against anything. A gunshot wound is not a neat cylinder, and a tampon cannot be pushed into its corners.

The larger problem is what it does to the person holding it. Putting a tampon in a wound feels like definitive treatment. It looks like something was done. But there is no reason to assume it has reached or compressed the bleeding source, and the person who placed it may stop doing the thing that actually works.

The capacity is worth knowing. Tampon absorbency is standardized by the FDA, and a super tampon is rated to hold 9 to 12 grams of fluid, which is roughly 9 to 12 mL. An adult carries somewhere around 5,000 mL of blood. At complete saturation, that tampon has absorbed about two tenths of one percent of the patient's blood volume, and then it is finished. There is a simpler way to picture the scale. A three inch by twelve foot roll of packing gauze contains 432 square inches of material. Tampon patents show how little starting material goes into the other one. One documented design uses an absorbent pledget of about 70 by 48 millimeters before it is compressed into the shape you recognize, which works out to a little over five square inches. Other designs run larger. Against 432 square inches in a single roll of gauze, you are looking at something on the order of seventy or eighty tampon pledgets. That is an illustrative surface area comparison and nothing more. It is not a claim about equivalent packing volume, mass, absorbency, or clinical effect, since different materials, thicknesses, fiber densities, construction, and compression all make those different measurements. It is there to give you a sense of scale. A tampon also contains far less usable packing material than a roll of gauze, and it is designed to expand into a relatively predictable anatomical space. A traumatic wound is an irregular cavity with branching tissue planes. The problem is not that the tampon cannot absorb enough blood. The problem is that it cannot be deliberately packed throughout that irregular space and concentrated against the bleeding source.

A roll of plain gauze costs less than a tampon and works. If commercial gauze is unavailable, use clean cloth if you have it. A torn shirt or a bandana can be fed into a wound and packed down onto the source, which is the thing a tampon cannot do. In life-threatening hemorrhage, material you can pack firmly into the wound right now is preferable to delaying while you look for something sterile.

People were packing wounds long before there was gauze

Before sterile gauze existed, wounds got packed with lint and charpie. Lint was carded cotton or linen scraped into fibers. Charpie was the same idea, shredded finer. Civilians produced it by hand in enormous quantities during the Civil War, and both armies ran on it. One account of how it was used could have been written for a modern bleeding control class. It was folded and pressed into or onto wounds, a bandage was placed over it, and that action helped control the bleeding. Lint and charpie stayed in use until sterile gauze pads arrived just before the First World War.

There is a detail in that history worth sitting with, given what this article has already said about tampons. Surgeons of that era had names for the different forms the packing material came in. A period source lists them as the pledget, the roll, the tent, the mesh, the bullet, the pellet, and the tampon. The word tampon comes from the French for plug, and in medicine it meant a wound plug long before it meant anything else. Period accounts describe prepared hemp lint being used by French surgeons in the Crimean War, while the word was still doing its original job.

A tampon was a wound plug before it was anything else. The name survived. The design went somewhere completely different.

So the instinct behind the myth is not crazy. It is about a hundred and fifty years out of date, and the object in the drugstore aisle was engineered for an entirely different problem in the meantime.

Nicholas Senn, who founded the Association of Military Surgeons of the United States in 1891 and served as a chief surgeon in the Spanish-American War, used to quote a German line from Friedrich von Esmarch that has outlasted most of what either of them wrote. The fate of the wounded rests with the one who applies the first dressing. He was making an argument about first aid in 1898 that the profession is still making now.

Where you pack and where you do not

This matters more than technique and it should come first, because the mechanism only works in places where the mechanism can work. Packing controls bleeding by filling a cavity and letting your pressure reach a vessel with something solid behind it. Every region on the yes list has those two features. Every region on the no list is missing at least one of them.

Extremities. Pack them. There is bone behind almost everything, the wound tract has a bottom you can reach, and the cavity closes when you fill it. This is the easiest place for packing to work, and it is also the place where a tourniquet is usually faster if the bleeding is life-threatening.

Groin. Pack it. The femoral vessels sit relatively superficial with the pelvis and the head of the femur behind them, and this is one of the junctional regions where a tourniquet has nothing to grab. Roughly 60 percent of the junctional deaths in the Eastridge data were groin and axilla.

Axilla. Pack it. Same reasoning. The axillary vessels run near the humerus and the chest wall, and there is no usable limb above the wound for a tourniquet.

Neck. Guidance varies here and it is worth knowing that before you need it. The 2023 joint position statement from NAEMSP, ACS-COT, and ACEP describes bleeding from torso and junctional wounds including the neck, shoulder, axilla, and groin as controllable with direct pressure and wound packing. Some EMS systems list the neck as a contraindication in their own clinical guidance. Follow yours. Where packing the neck is within your scope, do it carefully. It is a junctional region, it bleeds fast, and it accounted for about 39 percent of the junctional deaths in that same dataset. The caution is that aggressive packing can compress the airway, and packing both sides risks the blood supply to the brain. This is the region most worth training on specifically instead of improvising.

Chest. Do not blindly pack through a penetrating thoracic wound in an attempt to control bleeding inside the chest. Soft tissue of the chest wall is one thing. The pleural space is another. It is a potential space that enlarges as it fills with air or blood, so material pushed into it does not tamponade anything, and you can seed that space while accomplishing nothing about hemorrhage that is deeper than your hand can reach. A penetrating wound communicating with the chest cavity is managed as a chest injury. Depending on the wound and your protocol, that usually means a vented chest seal and close reassessment for respiratory deterioration.

Abdomen. Do not pack a penetrating abdominal wound. The abdominal cavity is large and compliant, it accommodates several liters without pushing back, and the bleeding is typically from a solid organ or a major vessel well beyond what you can reach from outside. Packing the entry wound leaves the hemorrhage untouched and costs time the patient does not have. An abdominal wound gets covered and gets moving toward a surgeon.

Packing works where you can fill the wound and press the bleeding against something. Inside the chest and the abdomen, you can do neither.

Open skull fracture. Do not pack it. You would be pressing material toward the brain through a defect in the only thing protecting it.

Eye. Do not pack it. Cover and protect, and do not apply pressure to a globe that may be ruptured.

Prehospital clinicians operating under specific trauma protocols may have exceptions for selected penetrating torso wounds. That is protocol-driven advanced care under medical direction, not general wound-packing practice, and it does not change anything above for a bystander.

There is a grim version of this rule in the history. Civil War triage sorted extremity wounds first, because those were the ones surgeons could do something about. One account notes that wounds to the head, neck, chest, and abdomen were treated last, if at all. The anatomy that made those wounds unmanageable then is the same anatomy that puts them outside what packing can reach now. What changed is that we can get those patients to an operating room, which is exactly why the intervention for a torso wound is a fast trip rather than a roll of gauze.

Packing against bone

Effective packing creates local tamponade by compressing the injured vessel against resistant surrounding tissue. Bone often contributes to that resistance, but it is not the only thing doing the work. In the groin, the femoral vessels run near the pelvis and the head of the femur. In the armpit, the axillary vessels run near the humerus and the chest wall. In the thigh, the femur and the dense surrounding tissue provide that resistance, though the geometry varies with where the wound is. The goal is not to distribute gauze evenly through the cavity. It is to concentrate packing at the deepest accessible source of bleeding and then build outward until the wound is completely filled.

This is why direction matters when you pack. You are not filling a hole evenly like spackle. You are pushing gauze down toward the source of the bleeding and packing it tight enough in that direction that the vessel has nowhere to go. Before you can identify anything, you usually have to clear what is sitting in the wound. Blood pools in the cavity and hides everything under it, and in a deep wound you will not see or feel a vessel through an inch of standing blood. Sweep or wipe it out with a gloved hand first. That single step is the difference between packing toward a source and packing toward where you assume the source is. If the source can then be identified visually or by controlled exploration, place the first gauze directly against it. Do not blindly probe a penetrating wound searching for a vessel. If brisk bleeding prevents you from seeing a discrete source, do not delay hemorrhage control while you search for one. Pack and compress.

Every void you leave is space where blood can keep accumulating.

Can I pack the wound after I put a tourniquet on?

I get this one in almost every class, and the answer is usually no, for a reason that has nothing to do with whether packing works.

A tourniquet that is doing its job has stopped the bleeding. If an extremity wound is anatomically amenable to tourniquet control and a properly positioned tourniquet has not stopped the bleeding, the immediate answer is generally to correct that tourniquet or apply a second one above it, not to substitute packing for inadequate tourniquet control. A tourniquet still allowing flow is usually not tight enough or not high enough. Packing a wound distal to a functioning tourniquet is treating a problem you already solved.

The other half of the answer is about resources, and it is the part people do not think about until they have run out of something. Gauze is finite. Hemostatic gauze is expensive and finite. If you have one casualty in front of you, spending a roll on a wound that is already controlled feels harmless. If you have three casualties and one roll left, you have just given the wrong patient your last piece of equipment.

A tourniquet that works has already done the job. Gauze spent on that patient is gauze the next one does not have.

There are exceptions and they are worth knowing. A wound too proximal for the tourniquet to fully control, where you have gone as high as the anatomy allows and there is still bleeding, may need both. Junctional wounds are the obvious case, since there was never enough limb for a tourniquet to begin with. And in a prolonged field care situation where tourniquet conversion is on the table, packing the wound is part of how you convert safely rather than just loosening a strap and hoping.

Outside those situations, the discipline is the same as everything else in this article. Match the intervention to the problem in front of you, and think about the patient you have not met yet.

When the wound is too small to get into

Training wounds are generous. Real ones frequently are not. A handgun entry wound can be smaller than the tip of your finger. The tract underneath it can be several inches deep and the injury at the bottom can be significant. You are looking at an opening you cannot get a finger into, with an artery bleeding somewhere below it.

A small entry wound does not mean a small injury. It should not lower your urgency, and the bleeding you can see on the outside tells you very little about what is happening inside. Work with what the wound gives you. Feed gauze in with a finger following it as far as the opening allows, and keep feeding rather than trying to force your whole hand into a space that will not take it. Use the tip of one finger to direct material deeper. If the opening genuinely will not accept packing, firm direct pressure over the wound with your body weight behind it is what you have, and it is worth doing.

This is exactly the wound XSTAT was built for, and exactly the wound most people will not have XSTAT for. Small openings are also more dangerous to your hands than large ones. You have less room, less visibility, and the same bone fragments and debris.

What this is actually like

Classes do not prepare people for the physical reality of this, and that gap is where hesitation comes from. You are going to put your fingers inside another person's body. It is warm. It is wet in a way that is difficult to describe and slippery in a way that makes everything harder. You will feel muscle, and fat, and sometimes bone. Things will move under your fingers that you did not expect to move.

If the patient is conscious, this is going to hurt them enormously. They may scream. They may swear at you. They may try to push your hands away or hit you. None of that means you are doing it wrong. Packing a wound correctly is one of the most painful things one person can do to another outside of an operating room, and tentative or superficial packing does not work.

Knowing that in advance is the point. The person who freezes is usually the person who was not expecting any of it.

Protect your own hands

There is a specific hazard here that almost no class mentions. Broken bone ends are sharp. A high-energy injury that opened a wound deep enough to need packing has often broken something, and the fractured ends inside that wound can be as sharp as anything in your kit. A colleague of mine packing a wound caught a finger on a bone spike and could not immediately pull free. He was, for a period of seconds that felt much longer, physically stuck to his patient, with a torn glove and a bleeding finger inside someone else's open wound.

That is a bloodborne pathogen exposure in the worst configuration available. His blood and the patient's blood in direct contact, inside a wound, with no way to separate quickly.

The wound you are packing may have something sharp in it that used to be a bone.

Gloves if you have them, and double them if you have enough. Work deliberately rather than jamming your hand in. When you sweep for the source, sweep with intent rather than groping. Be aware that bone fragments, and for that matter shrapnel, glass, and knife tips, can all still be sitting in the wound tract.

None of this is a reason not to pack. Someone bleeding from a junctional wound will die while you look for gloves that are not there. It is a reason to know what is in front of you, to protect yourself where you can, and to report and document any exposure afterward rather than deciding it was probably fine.

The part people skip

After the wound is packed, sustained direct pressure is still required. For most commonly used hemostatic gauzes, think in terms of minutes, not seconds. This is the step that gets shortened, and shortening it undoes the packing. Three minutes is a long time when someone is hurt in front of you and you want to check whether it worked. Checking early is how a clot that was forming gets disrupted, and you start over with a patient who has less blood than they had a minute ago.

Three uninterrupted minutes of firm pressure, using enough force to compress the bleeding tissue, before you disturb the packing to reassess. When you do check, come off slowly. Lifting a hand away quickly can act like a suction cup and pull the clot you just spent three minutes forming right back out of the wound. Ease the pressure off and watch what happens before you commit to taking your weight off it. Some hemostatic products specify different compression times. Follow the instructions on the package you are holding and your protocol.

Checking early is how a clot that was forming gets disrupted.

If it is still bleeding through, the answer is usually not more gauze on top. The answer is usually that the packing did not reach the source. Depending on the product and your protocol, failed gauze can be removed and the wound repacked, aiming differently. Do not assume that applies to every device. XSTAT, for example, is not intended to be removed in the field.

If you carry a second hemostatic dressing, use it on the repack. There is no reason to repack with plain gauze when the better material is sitting in your kit, and the first attempt failing usually means the first attempt was in the wrong place rather than that the agent does not work. Two failed attempts is information. It should make you question whether you are reaching the source, whether the injury is actually amenable to packing, and what the next level of hemorrhage control needs to be. In prolonged field care, adding packing where wound space remains or replacing a failed dressing may still be right. On a short transport, it usually means going.

Plain gauze works

Hemostatic gauze can improve hemorrhage control. Plain gauze still works. This matters because the person who is standing over a bleeding wound is usually working with whatever is in the kit in the trunk, and that is often plain roll gauze. The mechanism described above is a mechanical mechanism. It does not require a chemical agent. Plain gauze can control severe hemorrhage when it is packed tightly against the bleeding source and sustained direct pressure is maintained. Hemostatic gauze adds a second mechanism. It does not replace correct packing.

Buy hemostatic gauze if you can. Train with plain gauze too, because it is what you will have more often than not.

A note on cost

Hemostatic gauze is expensive, and price keeps it out of a lot of civilian kits that should have it. One approach I have discussed with clients is using a shorter length of hemostatic gauze placed at the source and backing it with plain gauze to fill the rest of the cavity. This is not a manufacturer-recommended technique, and I am not presenting it as an evidence-based alternative to using the full dressing. The reasoning is mechanical. The chemistry only does anything where the material contacts the bleeding tissue. Everything above that is tamponade, and plain gauze provides tamponade just as well for a fraction of the cost. Civilian penetrating trauma also tends to involve smaller wound cavities than the high-energy injuries the full-length dressings were designed around, though that is a tendency and not a rule.

Two honest caveats. It inverts the hardest part of the skill, because you now get one chance to place the active material at the right depth, and if you miss, the plain gauze behind it cannot make up for it. And manufacturer instructions specify using the full dressing, so an agency adopting this is deviating from the instructions for use, which is a protocol and documentation question before it is a clinical one.

There is a second cost nobody accounts for, and it lands hardest on exactly the people this matters most for. Hemostatic gauze expires. A prepared civilian buys a dressing, puts it in a closet or a range bag or a glovebox, and in most cases never opens it. Years later it expires unused and they buy another one, or more often they look at the price, decide the old one is probably fine, and now they are carrying something past date because replacing it every few years costs more than the kit did. That is the actual economics of a home kit, and it is why the person who needs this gear least in any given year is the person paying for it repeatedly.

I raise it because pretending cost is not a factor does not make it stop being a factor. A kit with a shorter hemostatic and a roll of plain gauze in it beats a kit with nothing in it because the ideal version was out of budget.

How hemostatic agents actually work

Two major families of hemostatic gauze dominate prehospital trauma care, and they work differently. This gets treated as a brand preference when it is actually a clinical distinction.

Kaolin is a mineral that accelerates the body's own clotting cascade. It activates the contact pathway, which speeds up the process that was already going to happen. It works with the patient's physiology.

Chitosan is derived from shellfish and works by a different route. It is mucoadhesive and interacts with blood cells and tissue to form an adhesive barrier largely independent of the conventional clotting cascade. That difference is mechanistically real and it is worth understanding. It should not be read as proof that one class works better in anticoagulated or hypothermic trauma patients. Laboratory studies on human blood have found kaolin dressings still improve coagulation in samples from patients on vitamin K antagonists, heparin, factor Xa inhibitors, and direct thrombin inhibitors. The mechanism differs. Demonstrated clinical superiority does not follow from that.

The two agents assist hemostasis through different pathways. That is a mechanistic difference, not proof that one produces better outcomes.

Neither agent works if it is not in contact with the bleeding vessel. Both are delivered on gauze for exactly that reason, and both still require the wound to be packed firmly and pressure to be held. A hemostatic agent laid on top of a wound is an expensive piece of gauze. Shellfish allergy comes up as a concern with chitosan. Shellfish allergy is directed primarily against shellfish proteins rather than chitin or chitosan, and testing of medical chitosan products has not demonstrated clinically significant reactions in shellfish-allergic subjects. It is worth knowing about and it is not a reason to withhold treatment from someone who is bleeding to death.

What is in the products you have probably seen

Disclosure: Penn Tactical Solutions is an authorized dealer for some of the products named below and not for others. Everything here is included on mechanism and available evidence, not on whether we stock it. This section describes how these products work and is not a recommendation of one over another.

QuikClot Combat Gauze is kaolin-impregnated gauze. It works by the mineral route described above, accelerating the patient's own clotting cascade through the contact pathway. It is the hemostatic dressing carried by much of the U.S. military and is widely fielded in civilian EMS. Celox Gauze is chitosan-impregnated gauze. It works by the adhesive route, binding to tissue and red blood cells to form a physical seal that does not depend on the clotting cascade running normally.

Celox Rapid is a chitosan gauze using a modified formulation the manufacturer describes as adhering faster, with a shorter recommended compression time than standard chitosan or kaolin dressings. The mechanism is the same adhesive route. The claim is about speed of adherence, and the compression time on the package is the one to follow rather than a general rule you remember from another product.

ChitoGauze is another chitosan-impregnated gauze, working by the same adhesive route as Celox. Different manufacturer, same family of mechanism. A word about everything else on the shelf. There are hemostatic products marketed for trauma that use other chemistries, including oxidized regenerated cellulose, which is plant-derived and provides a physical matrix for clot formation while producing a locally acidic environment that contributes to its effect. Cellulose-based agents have a real and established evidence base in surgery, where they are used for mild to moderate bleeding in a controlled field with the surgeon's hands already on the source. At least one review has noted their effect is less pronounced in high-pressure bleeding.

That surgical evidence does not transfer automatically to an arterial junctional wound in a driveway. The dressings that have been tested repeatedly in prehospital trauma models, and that CoTCCC has evaluated and recommends, are the kaolin and chitosan gauzes. Products outside that set may work. The comparable data showing they control arterial hemorrhage in the field is not there in the same way, and some are marketed with claims of shorter or reduced compression requirements. Those claims should be evaluated against that specific product's evidence rather than assumed to apply to traumatic arterial wound packing generally.

There is precedent for being careful here. In 2008, after testing at the Army Institute of Surgical Research and the Naval Medical Research Center, CoTCCC recommended two agents: QuikClot Combat Gauze and a granular product called WoundStat. WoundStat did not last. Early efficacy looked promising, but subsequent testing raised concerns about tissue effects and the potential for the granular material to enter the circulation, and it was subsequently removed from CoTCCC recommendation. A product can clear the bar, get fielded, and be withdrawn, which is a reason to follow the current list rather than the one you learned.

It is also worth being honest about how thin the human evidence is across this entire category. When the American College of Surgeons published its hemorrhage control guideline, the recommendation for hemostatic gauze rested largely on animal studies. A 2014 evidence review of Combat Gauze concluded the available data did not conclusively demonstrate effectiveness in trauma patients, called the results promising, and called for larger prospective and randomized prehospital trials, which remain limited. One of the best-known prehospital human series is an Israeli military report involving 122 patients.

None of that means the dressings do not work. It means the confidence gap between the marketing and the human literature is wider than most kit lists suggest, and no hemostatic agent compensates for poor wound packing or inadequate pressure. If you are buying for an agency or for your own kit, the current CoTCCC guidelines list the dressings that have cleared that bar. That list is the right starting point, and it is worth checking rather than assuming, because it changes.

XSTAT deserves specific mention because it is probably the closest medical analogue to what people imagine a tampon would do in a wound, except that it is engineered for hemorrhage control. It is a syringe-style applicator that injects dozens of small compressed cellulose sponges into a wound tract. They expand on contact with blood and create mechanical tamponade from the inside. It was developed for junctional, noncompressible wounds not amenable to tourniquet control, and is particularly suited to deep, narrow wound tracts. FDA labeling excludes several anatomical regions, including the thorax, abdomen, retroperitoneum, and tissues above the clavicle. The sponges carry radiopaque markers so they can be counted and found on imaging in the operating room.

That last detail is the difference between an engineered solution and an improvised one. XSTAT is an expanding plug, which is exactly the concept behind the tampon idea. The reason it works is that the sponges are sized to fill a tract, delivered under pressure to the depth of the wound, and designed to be found and removed surgically. A tampon has none of that.

One piece of history explains why some people are suspicious of hemostatics generally. The original QuikClot was a zeolite granule product that worked by absorbing water from blood, and the reaction was exothermic. It generated real heat and caused thermal injury to tissue and occasionally to the people applying it. Granular agents also scattered and were difficult to place accurately. The industry moved to impregnated gauze for those reasons, and the current kaolin and chitosan gauze products do not have that problem. If you have heard that hemostatics burn people, that is where it came from, and it is a generation out of date.

The practical point is not which package is better. It is that two different mechanisms are sitting in the same aisle. Understanding the difference matters most when you are evaluating manufacturer claims about performance in coagulopathy, hypothermia, or anticoagulation. Laboratory work on human blood has found kaolin dressings still improve coagulation in anticoagulated samples, so the intuition that a cascade-dependent agent simply fails in those patients is not supported. That is a reason to understand what is in your kit rather than a reason to buy a particular box.

What the evidence says about which matters more

There is a common argument in hemorrhage control that technique can matter at least as much as the product in your hand. Some of the experimental evidence supports that idea. A 2011 study in Academic Emergency Medicine compared four hemostatic agents against plain gauze in a swine model of penetrating groin injury. Each was packed and held with five minutes of manual pressure. Across initial hemostasis, rebleeding, and survival, the researchers found no significant difference between plain gauze and the hemostatic agents. Their conclusion was that proper packing and pressure may matter more than which agent is used, at least in small penetrating wounds not amenable to a tourniquet.

Other work has found no clear superiority between products. A porcine comparison of ChitoGauze and Combat Gauze, working by entirely different mechanisms, found them statistically similar. A later study comparing several contemporary dressings against Combat Gauze reached broadly similar conclusions. Those are not technique studies. They show an absence of demonstrated superiority between products in those models.

The picture is not one-sided. Other animal models, particularly those involving severe vascular injury and induced coagulopathy, have shown an advantage for hemostatic gauze over plain gauze. Taken together, the evidence does not make the product irrelevant. It makes technique non-negotiable. Hemostatic chemistry can improve the odds. It cannot compensate for packing that never reaches the source or pressure released too early.

These are animal models with controlled injuries and trained operators, and that is a real limitation. They do not prove plain gauze is equivalent in every human wound. What they do establish is that the gap between agents is smaller than most people assume, and that the variable doing the heavy lifting is how the wound was packed and how long pressure was held.

The agent is a smaller variable than the technique. Buy the good gauze. Then learn to pack.

The practical consequence is where your effort should go. A hemostatic dressing packed loosely, into the wrong part of the wound, with ninety seconds of pressure, is worse than plain gauze packed correctly into the source with three full minutes on it. The chemistry does not rescue bad mechanics. This is also why training with plain gauze is not a compromise. It is the same skill. The technique you build on a cheap roll is the technique that makes the expensive roll work.

Whichever you carry, read the compression time on the package and follow that one. They are not all the same, and the number you remember from a class five years ago may not match what is in your hand.

Junctional bleeding

The reason packing matters so much is that tourniquets cannot reach everywhere. A conventional extremity tourniquet needs enough limb above the wound for the device to be placed and tightened effectively. That works extremely well for most severe bleeding from an arm or a leg. It stops working as the injury moves into the junction between the limb and the torso.

A wound deep in the groin, the axilla, the shoulder girdle, or the base of the neck may injure major vessels while leaving no usable segment of limb above it. Those areas carry some of the largest vessels in the body and they bleed fast. Packing is the primary answer there, and for a bystander it is usually the only answer.

There is hard data on how much this matters. Eastridge and colleagues reviewed 4,596 battlefield fatalities from October 2001 through June 2011 and published the analysis in the Journal of Trauma and Acute Care Surgery. Of those deaths, 87.3 percent occurred before the casualty ever reached a medical treatment facility. Of the prehospital deaths, 24.3 percent, or 976 casualties, were judged potentially survivable. Hemorrhage was the cause in 90.9 percent of that group. When they broke down where the lethal bleeding was coming from, truncal hemorrhage accounted for 67.3 percent, junctional hemorrhage for 19.2 percent, and extremity hemorrhage for 13.5 percent.

That junctional number is the one worth sitting with. Roughly one in five potentially survivable prehospital deaths came from bleeding in the groin, the axilla, or the neck. The breakdown within that group was about 61 percent axilla and groin and 39 percent cervical. These are wounds a tourniquet cannot reach, in patients who could have lived, dying of bleeding that was externally compressible.

Roughly one in five potentially survivable prehospital combat deaths came from bleeding a tourniquet could not reach.

Extremity hemorrhage, by comparison, accounted for 13.5 percent, and that number has come down substantially since the military made aggressive tourniquet use standard. One analysis put preventable deaths from extremity hemorrhage at 7.8 percent in an earlier study and 2.6 percent in Eastridge, a two thirds reduction. That is what happened when a profession took one hemorrhage problem seriously and trained hard on the intervention that fixed it. Junctional bleeding is the problem that did not get that treatment, and packing is the skill that addresses it.

Junctional tourniquets exist and work in trained hands with the device present. Most people do not have one. Packing is the skill that covers the gap.

What actually matters

Find the source. Packing works when it reaches the bleeding vessel and fails when it does not. If you can identify it visually or by controlled exploration, place your first gauze against it. Do not blindly probe a penetrating wound. Pack firmly and pack completely. Fill the entire cavity. Empty space is space where blood keeps accumulating. A conscious patient will react, and that reaction is not your endpoint. Hemorrhage control is.

Pack toward the bleeding and against bone where the anatomy allows it. Direction is not incidental. Hold firm uninterrupted pressure without checking. TCCC uses at least three minutes as its standard for hemostatic dressings. Some products carry different manufacturer instructions. Follow your protocol and the package in your hand. Do not pack chest or abdomen. A wound communicating with the chest cavity is managed as a chest injury. Cover the abdomen and move.

If it bleeds through, repack rather than adding more on top. Bleeding through usually means the packing missed the source, and more gauze on top of a miss is still a miss. Get them moving toward a surgeon. Packing controls bleeding. It does not repair a vessel, and the injury that required packing usually requires an operating room.

If you cannot bring yourself to do it

Everything above describes the right way to do this. It is worth being honest about how often the right way is going to happen. Bleeding control is taught as though the bystander will have gloves, gauze, training, and the composure to put their hands inside an open wound. Most people will have none of that. Wound packing is invasive, it is physically unpleasant, and asking an untrained person to do it to a screaming stranger is asking a great deal.

The equipment conversation has the same problem. XSTAT costs hundreds of dollars per applicator. It is not a realistic item for a home kit or a glovebox, and telling people the ideal answer while the ideal answer is priced out of reach is how you end up with people carrying nothing. So here is the honest version. There is a ladder, and every rung on it beats the ground.

Packing correctly, into the source, with sustained pressure, is the top of it. Firm sustained direct pressure with your body weight over a folded dressing is lower, and it is real hemorrhage control that stops a great deal of bleeding. Pressing down hard on whatever material you have is lower still, and it is meaningfully better than nothing. Standing there is the only rung that is actually zero.

The gap between packing and pressure is smaller than the gap between pressure and freezing.

Train so that you can pack a wound. That is why this article is as long as it is. But if the moment arrives and you cannot make yourself do it, put your hands on the wound and press as hard as you can and do not let up. That is not the recommended treatment. It is not nothing, and it is what a great many people are actually going to be capable of.

What providers can add

The mechanism does not change with scope. What changes is what you can do after the packing is in. Hemostatic selection based on the patient in front of you rather than on what came in the kit. Know which product you carry and how it works, and do not mistake a mechanistic difference for a patient-selection algorithm. Current evidence does not establish that an anticoagulated or hypothermic trauma patient should automatically receive chitosan rather than kaolin, or the reverse. Follow your protocol, use an approved dressing, and put the effort into placement and sustained pressure.

Pressure dressings that maintain compression once your hands come off, so the packing is not depending on continuous manual pressure through an extrication and a transport. Aggressive hypothermia prevention, because hypothermia impairs coagulation and platelet function in a patient who already has little margin for further bleeding. That connects directly to the lethal circle covered in our piece on compensated shock.

Reassessment after every move. Packing that held on scene comes loose during an extrication, a stair chair, or a transfer to the cot. The bleeding you controlled ten minutes ago is not permanently controlled.

The thing worth remembering

Everything about wound packing follows from one idea. Pressure stops bleeding, and gauze is how pressure gets to a vessel your hand cannot reach. Loose packing fails because pressure needs something to push against. Tampons fail because absorbing is not compressing. Sustained pressure matters because hemostasis needs uninterrupted time. Hemostatic agents help because they work at the surface where the gauze meets the vessel.

Understand the mechanism and the technique follows. Memorize the technique without the mechanism and you will do it halfway on the day it counts.

The gauze is the tool. Your hand is the treatment.

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References and further reading

• STOP THE BLEED. American College of Surgeons Committee on Trauma. Public bleeding-control training covering direct pressure, wound packing, and tourniquet use.
• Deployed Medicine. Committee on Tactical Combat Casualty Care guidelines, including current guidance on hemostatic dressings and wound packing technique.
• Committee on Tactical Emergency Casualty Care. TECC guidelines adapting combat casualty care principles to civilian operational environments.
• Littlejohn LF, Devlin JJ, Kircher SS, Lueken R, Melia MR, Johnson AS. Comparison of Celox-A, ChitoFlex, WoundStat, and Combat Gauze hemostatic agents versus standard gauze dressing in control of hemorrhage in a swine model of penetrating trauma. Academic Emergency Medicine. 2011;18(4):340-350. Found no significant difference between plain gauze and hemostatic agents, and concluded that packing technique and pressure may matter more than the agent.
• Eastridge BJ, Mabry RL, Seguin P, Cantrell J, Tops T, Uribe P, et al. Death on the battlefield (2001-2011): implications for the future of combat casualty care. Journal of Trauma and Acute Care Surgery. 2012;73(6 Suppl 5):S431-S437. The source for the potentially survivable death data and the breakdown of lethal hemorrhage by site.
• U.S. Food and Drug Administration. 21 CFR 801.430, User labeling for menstrual tampons. The regulation standardizing tampon absorbency ranges.
• U.S. Patent 7,472,463. Tampon and method of manufacture. Source of the pre-compression pledget dimensions used in the surface area comparison.
• Kunio NR, Riha GM, Watson KM, Differding JA, Schreiber MA, Watters JM. Comparison of two packable hemostatic gauze dressings in a porcine hemorrhage model. American Journal of Surgery. 2011. Found ChitoGauze and Combat Gauze equally efficacious despite different mechanisms of action.
• Berry C, Gallagher JM, Goodloe JM, et al. Prehospital Hemorrhage Control and Treatment by Clinicians: A Joint Position Statement. Prehospital Emergency Care. 2023;27(5):544-551. NAEMSP, ACS-COT, and ACEP joint statement describing direct pressure and wound packing for torso and junctional wounds including the neck, shoulder, axilla, and groin.
• U.S. Food and Drug Administration. XSTAT device review, K130218 and De Novo DEN130016. The regulatory source for XSTAT indications, the anatomical exclusions including thorax, pleural cavity, mediastinum, abdomen, retroperitoneum, sacral space above the inguinal ligament, and tissues above the clavicle, and the instruction that sponges are removed surgically rather than in the field.
• Bennett BL. Bleeding control using hemostatic dressings: lessons learned. Wilderness & Environmental Medicine. 2017;28(2S):S39-S49. Reviews the evolution of CoTCCC hemostatic recommendations, including the adoption and later withdrawal of WoundStat.
• Pennsylvania Department of Health, Bureau of Emergency Medical Services. Pennsylvania Statewide BLS Protocols. Protocol 601: Bleeding Control. 2023.