How much blood loss is life-threatening?

Generally, if the rapid blood loss exceeds twenty percent of the total blood volume of the whole body (about 1000 ml), shock can occur, affecting the safety of life. However, the compensatory ability of patients of different ages for blood loss shock varies greatly, with young people having strong compensatory ability for blood loss shock and the elderly having weak compensatory ability for blood loss shock. Young people have a strong cardiovascular compensatory capacity, in the case of massive blood loss, some patients can compensate within a certain limit, so that the blood pressure is maintained in the normal range; while the elderly often suffer from cardiovascular diseases, such as hypertension, coronary heart disease, etc., in the case of massive blood loss, the compensatory capacity is weak, and often heart failure, shock, and then dangerous life. Warm reminder, once a large amount of blood loss, should promptly seek medical attention, to avoid delaying the condition, affecting the safety of life.

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