Quick Answer
Use a tourniquet when you have severe bleeding from an arm or leg and are unable to apply a hemostatic agent or compress the wound tightly. The bleeding should be arterial and not venous, with a pulse visible in the limb. This may occur due to a severe laceration, gunshot wound, or crush injury.
Choosing the Right Situation
When to use a tourniquet is crucial, as improper application can do more harm than good. Apply it only when the bleeding is severe and uncontrolled. Typically, this means the bleeding is so profuse that it’s soaking clothing and affecting the victim’s ability to walk or even breathe. The tourniquet should be applied to the wound’s proximal end, not over a joint or bony prominence, to avoid further injury.
Applying the Tourniquet
The CAT (Combat Application Tourniquet) and similar tourniquets are the most popular choices due to ease of use and effectiveness. The CAT features a windlass system for tightening the tourniquet. To apply, place the tourniquet above the wound, about 2-3 inches proximal to the wound site. Wrap the tourniquet around the limb, then pull the windlass to tighten. Use six full turns to secure the tourniquet in place. After each turn, check the bleeding to see if it stops.
Monitoring and Releasing
After applying the tourniquet, monitor the victim’s condition and the limb’s temperature and sensation. The tourniquet should be considered effective if the bleeding stops within 1-2 minutes. However, if the bleeding doesn’t stop or the victim shows signs of ischemia (such as pale or cool skin, numbness, or a lack of pulses), the tourniquet may need to be released. To do so, carefully loosen the windlass and check the bleeding. If it resumes, reapply the tourniquet.
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