Chapter 10 of electronic textbook of pathophysiology: shock. Shock is a syndrome in which the body is attacked by strong pathogenic factors, the effective circulating blood volume is sharply reduced, and the tissue blood perfusion is widely, continuously and significantly reduced, resulting in poor microcirculation function and serious obstacles in important organs.

At this time, the body's dysfunction, tissue ischemia and hypoxia, neurohumoral factors imbalance. Its main characteristics are: insufficient microcirculation perfusion of important organs, metabolic disorder and dysfunction of various systems in the whole body.

Classification of hypovolemic shock

(1) hemorrhagic shock

It refers to a syndrome of peripheral circulation failure caused by a large amount of blood loss, which quickly leads to a sharp decline in effective circulating blood volume. Generally, when the blood loss is less than 10% of the total blood volume within 15 minutes, the body can compensate. If the rapid blood loss exceeds about 20% of the total blood volume, it can cause shock.

(2) Burn shock

Large-scale burns with a large amount of plasma loss can lead to burn shock. Shock is related to pain and hypovolemia in the early stage, and can be secondary to infection and develop into septic shock in the later stage.

(3) Traumatic shock

The occurrence of this shock is related to pain and blood loss.