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As for the tampon idea... this has been run over and over and over again. Tampons absorb blood, they don't STOP the flow. Packing a wound with kerlix and applying direct pressure helps the blood clot and staunch the flow.
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From a medical standpoint only, and completely ignoring all other factors mentioned, there is NO difference between tampons and kerlix, as both will do the exact same job! Neither stop the flow! Both absorb liquids. There is no difference in function......just size!
Tampon = compacted woven cotton that will expand when saturated, colleting more volume of fluid than its original size
Kerlix = fluffed woven cotton that will stay the same size when saturated, collecting the same volume of fluid as its original size
You are packing the wound, to put INTERNAL pressure on the bleeding organ/artery/vein. You then use a pressure dressing over both. Kerlix is better than a tampon for variety of reasons, but a tampon(s) is better than nothing at all.
Now, considering everything else, ANYONE using a IFAK is deep crap. Something went bad. You are already improvising and doing anything you can to increase chances of survival. textbook is gone and you use what you can. Don't have a TQ? Use a belt, use a hsoe lace or anything else you can find! 99% of folks with a IFAK won't get squat done with the ONE roll of Kerlix they carry in their IFAK, even with the pressure dressing if they come across a genuine GSW or stab wound. You are screwed from minute one, especially when there is both an entry and exit wound! And even with just an entry wound, it will be worthless in about 30 seconds after applied for most. The more you get in there, the better you are. All of us LEO's have a "space" issue with the amount of gear we can carry and it is not practical to carry multiple rolls of kerlix.
I have been doing EMS for 22 years (paid and volunteer) and LE for 18 years, six of which is tac med. SOMA and John Hopkins Center for Law Enforcement Training all teach the same- when you can't carry all the rights tools, improvising with the best options is OK. While it may not be textbook or ideal, if you can't carry a full trauma kit, tampons enhancing kerlix are actually a lot smarter than just a role of kerlix or just a tampon. So if a LEO "enhances" his IFAK with one or two high flow tampons, he or she is not doing anything wrong.