Mastering the appropriate tourniquet pressure and continuous application time can reduce the occurrence of the tourniquet. So people study the pressure of tourniquet and the duration of application.
It is generally believed that the pressure of the adult upper limb tourniquet should be maintained in the 250~300mmhg, the lower limbs should be in the 500~600mmhg, the child and the skin weak patient pressure may reduce appropriately. The duration of the tourniquet is usually not more than LH, and the lower extremity is not more than 1.5h. The width of the tourniquet cuff is very important, the wider the cuff, the lower the pressure required to block arterial blood flow. Using a wide sleeve tourniquet to block arterial blood flow in small legs requires an average of 200mmHg less pressure than the traditional tourniquet. The best width of the tourniquet is 10~15cm. Under this width, the best blood pressure of the upper limb is arterial systolic pressure +50mmhg, the lower extremity is the arterial systolic pressure +80mmhg. When the local tourniquet pressure is 300mmHg, it can still retain about 50% arteries over perfusion and venous reflux, which can safely stop bleeding, but also partially retain the distal limb blood circulation. At present, it has been recognized that the pressure of the tourniquet should be individualized, depending on the thickness of the local tissue, the age of the patient, the circumference of the limb and the systolic pressure of the local arteries.