The process of death due to excessive blood loss, why do people die from excessive blood loss

First of all, large blood loss in a short period of time does cause physical failure, but it does not cause tissue necrosis.

The mechanism of death from excessive blood loss is as follows:

If the bleeding exceeds 15% of the total amount of blood, the body's compensatory function urgently calls the blood stored in the spleen and liver to participate in the circulation, and at the same time accelerates the heartbeat and produces vertigo, the purpose is twofold, one is to warn, and the other is to speed up the heartbeat to increase the speed of blood flow to ensure the efficiency of oxygen delivery in the case of insufficient blood volume, and reduce the work efficiency of the brain to reduce oxygen consumption, but this can lead to dizziness.

When more than 20%, the amount of blood loss has exceeded the scope of compensation of the human body, the human body by forcibly reducing the oxygen consumption of various tissues of the body, and even cutting off the end of the capillary blood supply to make up for the lack of blood capacity, first to ensure the oxygen demand of the brain and vital organs, the human body will appear pale, pale lips, cold sweat, cold hands and feet, weakness, shortness of breath, fast pulse and other symptoms.

The total amount of bleeding exceeds 30%, because all the blood stored in the body (about 20% of the whole body blood volume) is fully involved in circulation, the spleen and liver become lighter in color, and the heart rate increases to speed up oxygen transport, but due to the lack of blood quantity, the efficiency of oxygen delivery is reduced, and the brain begins to have symptoms of hypoxia, resulting in blurred vision, thirst, dizziness, confusion or restlessness, and syncope. < - Prompt blood transfusions can relieve symptoms at this time.

The total amount exceeds 40%, due to the extreme lack of blood, unable to return to fill the ventricles, which leads to "ventricular tachycardia", cerebral ischemia is further strengthened, and people usually fall into a deep coma or shock, which endangers the life safety of people. < - At this time, timely blood transfusion and rescue can save lives.

The total amount reaches 50%, reaching the theoretical limit of human blood loss, at which time the human pulse is almost gone, the blood pressure is almost undetectable, the sinus pulsation of the heart stops, breathing stops after 30 seconds, and the brain is extremely hypoxic. < - In this case, the human brain can only last about 5 minutes, after 5 minutes the brain cells will enter an irreversible state of death, according to the current medical technology, if the patient is already on the operating table at this time, through emergency blood transfusion and hemostasis, it is possible to save lives.

If the total amount exceeds 60%, even if emergency blood transfusion is taken, it is possible to restore circulatory function in a short time, but it may cause long-term cerebral hypoxia, which in turn leads to large-scale death of brain cells, deep coma (vegetative state) and even brain death.

The greater the amount of blood loss, the more important it is to treat and replenish blood this morning, otherwise it is extremely easy to die.

Death caused by blood loss is caused by insufficient oxygen supply to the brain, which in turn leads to a lack of oxygen to the brain, and eventually brain death. In general, the rate of death is extremely rapid, and although the body can also be deprived of oxygen, because the other tissues of the body are much more resistant to hypoxia than nerve cells, blood loss at such a rapid rate does not induce necrosis of tissues other than brain cells.

first understood that he was losing a lot of blood, and then his heart tightened, and then he became dizzy. The spirit was shaky and began to hallucinate. You may cough and have cold and unresponsive limbs after falling to the ground. It was getting darker and darker in front of me, and then I fainted.

First see blood in one place, then dizziness, weakness, then chest tightness, more and more dizziness, more and more weakness, and then over

Excessive blood loss can cause trachea and cell dysfunction and organ failure, so it is very important to transfuse blood and rehydrate as soon as possible. Blood is the flow carrier of oxygen and nutrients in the human body, and when there is too much blood loss, the oxygen and nutrients obtained by the human body will be insufficient, and the body will have symptoms of hypoxia, and the survival of the right person must rely on oxygen.

One of the functions of blood is to transport oxygen, if there is ischemia, then many parts will be deprived of oxygen due to ischemia, which will cause tissue death! Finally people die!

Because blood is the flow carrier of oxygen and nutrients in the human body, when there is too much blood loss, the oxygen and nutrients obtained by the human body will be insufficient, and the body will have symptoms of hypoxia, and human survival must depend on oxygen, so excessive blood loss will lead to death. Hope to help you...

The main role of white blood cells in the blood is to control the circulation of oxygen in and out, if there is too much blood loss, a large amount of white blood cells are lost, and oxygen is not available, it will lead to shock or death.

The human body contains a large number of red blood cells in the blood, and the function of red blood cells is to carry oxygen to the whole body with the circulation of blood. If a person is seriously injured and loses a lot of blood, then oxygen cannot be transported. We will not be able to survive, especially the human brain, which is the least able to lack oxygen, and even if it is interrupted for only 2-3 minutes, it will have serious consequences.

Blood is an opaque red liquid that flows through the heart and blood vessels, and is mainly composed of plasma, blood cells, and platelets. Blood cells are further divided into red blood cells and white blood cells. Blood contains various nutrients, such as inorganic salts, oxygen, metabolites, hormones, enzymes and antibodies, etc., which have the role of nourishing tissues, regulating organ activity and defending against harmful substances.

Physiological and pathological changes in various organs of the human body often cause changes in blood composition, so it is often necessary to diagnose diseases through blood tests after illness. 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. If the amount of blood loss is less than 10 of the total blood volume, it can be quickly recovered 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.

Blood is an important part of the composition of the human body, it is a tool to transmit oxygen to the human body, cells will die if they lack oxygen, and the white blood cells in the blood that have never caused the death of the human body have the main role of controlling the circulation of oxygen in and out, if there is too much blood loss, a large amount of white blood cells are lost, and oxygen can not be provided, it will lead to shock or death.

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.

When blood loss exceeds 1000 ml, it can be life-threatening.

Blood loss of 800 ml will lead to fainting, 1000 ml will cause shock, and by 1200 ml will cause death, the whole body blood accounts for about 8 percent of body weight, approximately. In the quiet state, only the blood is working, and the rest (about all stored in the liver, spleen, and capillaries) is released to replenish the blood circulation when the body needs it (such as exercise, blood loss, etc.). Therefore, if the bleeding is greater than 500 at one time or the bleeding exceeds in a short period of time, blood transfusion is required to avoid shock.

If you exceed 1L, you will die if you have 800ml, and you will get dizzy.

If you lose more than 20% of your blood, you will go into shock and die if you don't get timely treatment. (People weighing 50kg have about the blood, you can count it yourself).

There was a car crash that caused a rupture of the corpus luteum and internal bleeding, about 500ml of blood in the body around the intestines, shortness of breath, weak pulse, dizziness, and almost fainting.

Half of the total blood in the human body is lost, and the life is fast.

A normal person's blood volume accounts for 7% 8% of body weight, and if a person has 60kg, the blood volume is about 4500ml. The amount of blood loss is small, below 400ml, and the blood volume is slightly reduced, which can be compensated by tissue fluid and spleen blood storage, and the circulating blood volume can be improved within 1 hour, so there can be no conscious symptoms. When symptoms such as dizziness, palpitation, cold sweat, fatigue, and dry mouth appear, it means that the acute blood loss is more than 400ml; If there is syncope, cold limbs, little urine, and irritability, it means that the bleeding is large, and the blood loss is at least 1200ml; If the bleeding continues, in addition to syncope, there is still shortness of breath and anuria, and the acute blood loss has reached more than 2000ml.

At this time, if there is no immediate rescue measures, death will occur quickly.

It's hard to answer this question, because if you die, you have to consider not only the amount of blood loss but also the speed of blood loss, because the human body will compensate for the blood loss by transferring the fluid inside the cell to the outside of the cell to compensate for the blood. Chronic blood loss is generally relatively large, and only then will shock and eventually die, if the acute blood loss is very small, it will quickly go into shock and finally die.

More than 400 will be dangerous, and a few hundred more will die.