The maximum length of time a person can live in a state of blood loss

The effect of blood loss on the human body varies with the amount of blood and the speed of bleeding, if the amount of blood loss is less than 10% of the total blood, the human body only needs to mobilize the stored blood to participate in the circulation, there will be no obvious discomfort. If the blood loss reaches 20% of the total blood volume, the body is still insufficient to maintain the normal level of blood volume and blood pressure after compensation, and the person's life activities will be affected. The amount of blood loss exceeds 30% in a short period of time, and if the blood is not transfused in time, it can be life-threatening.

In general, an adult with blood loss of 500 ml can have no obvious symptoms. When the amount of blood loss is more than 800 ml, there will be symptoms such as paleness, pale lips, cold sweat, cold hands and feet, weakness, shortness of breath, and fast and weak pulse. When the amount of blood loss reaches more than 1500 ml, it can cause insufficient blood supply to the brain, and the injured person will have symptoms such as blurred vision, thirst, dizziness, confusion or restlessness, and even coma.

After being sent to the hospital to stop the bleeding, normal saline and nutrient solution can be added to replace the blood transfusion in the process of finding plasma.

If it is an artery, it can be tied with a rubber band at the proximal end, it should be tightened, loosen it for a while at half an hour, and plug the wound with a clean object at the bleeding site.

If there is venous bleeding, tie it with a rubber band at the distal end.

Hold down the major arteries in your wrist and don't let too much blood out. As far as I know, there was a guy who lasted 4 hours.

Shock occurs when blood loss exceeds 30% of the total blood volume; 40%-50% will have severe shock.

Blood loss and symptom presentation:

1. Blood loss of 500 1000ml (equivalent to 10 20 blood volume) does not cause anemia and rarely causes symptoms, but about 5 people have symptoms due to "vasovagal reaction".

2. The amount of blood loss is 1000 1500ml (20 30 of the total blood volume), after quiet rest, if it is a healthy young person, take the supine position can not show symptoms, the mental state is stable, but cardiovascular symptoms can occur after activities.

3. Blood loss of 1500 2000 m1 (30 40 of total blood volume), even in the supine rest state, there are obvious symptoms; Cold hands and feet, rapid pulse, decreased blood pressure, pallor, low thirst and urine, and transient loss of consciousness.

4. If the blood loss exceeds 2000 2500ml (40 50 of the total blood volume), severe hemorrhagic shock can occur, which can lead to death if not properly treated. Older patients with pre-existing chronic illness, infection, malnutrition, dehydration or pre-existing anemia, even if the amount of blood loss is less than above, can lead to shock or death.

Shock occurs depending on the rate and amount of blood lost, and when blood loss is less than 10% of the whole blood volume within 15 minutes, the body can compensate to stabilize blood pressure and tissue perfusion. Rapid blood loss of more than 20% of the total blood volume can cause shock, and more than 50% of the total blood volume often leads to rapid death.

Rapid blood loss of more than 20% of total body blood volume

The amount of blood in the human body is about 7 8 of body weight, if the weight is 60 kg, the blood volume is about 4200 4800 ml. Blood vessel rupture caused by various causes can lead to bleeding, and if the amount of blood loss is small, not more than 10 of the total blood volume, it can be recovered quickly through the body's self-regulation; If the amount of blood loss is large, reaching 20 of the total blood volume, symptoms such as rapid pulse and decreased blood pressure will appear; If 30% or more of the body's blood is lost in a short period of time, it can be life-threatening.

If a healthy adult loses more than 30% of the blood volume (1200-1500 ml) in the body at a time, it can be life-threatening. If it does not exceed 10% (about 400 ml), the lost blood cells and plasma components can be replenished over a period of time and return to normal.

The total blood volume in a person's body is about 8 percent of body weight. If the weight is 100 catties, the blood volume is 8 catties. i.e. 4 kg. The combined volume is 4000 ml, of which plasma accounts for more than half.

If a healthy adult loses more than 30% of the blood in his body at a time, his life is in danger.

If you exceed 1/3 of your own blood intake, your life is in danger