Quick Answer
Apply a tourniquet in wilderness trauma situations where severe bleeding is life-threatening and cannot be controlled by other means, such as direct pressure or hemostatic agents. The goal is to prevent exsanguination until medical help arrives. Use a tourniquet as a last resort.
Indications for Tourniquet Use
In wilderness trauma, a tourniquet is indicated when bleeding is severe and uncontrolled, such as from a severe laceration, amputation, or penetrating trauma. If the patient is hemodynamically unstable, meaning they are showing signs of shock, such as pale or cool skin, rapid heart rate, or decreased urine output, a tourniquet may be necessary. Use a tourniquet on limbs with a diameter of 2 inches (5 cm) or less, as this is the most effective size for controlling bleeding.
Application Techniques
When applying a tourniquet, place it between the wound and the heart to minimize blood flow to the affected area. The tourniquet should be tightened until bleeding stops, but not so tightly that it compromises blood flow to the limb proximal to the tourniquet. A tourniquet should be tightened in small increments, checking for a pulse in the affected limb after each tightening. The goal is to achieve a pressure of 250-300 mmHg, which is typically sufficient to control bleeding.
Monitoring and Maintenance
Once a tourniquet is applied, monitor the patient’s vital signs closely, checking for signs of ischemia, such as numbness or tingling in the affected limb. The tourniquet should be checked and adjusted every 2 hours to prevent damage to the affected limb. If the patient is receiving medical attention, the tourniquet should be removed and the wound evaluated and treated as soon as possible.
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