Classification of liver failure
The syndrome is classified according to several key criteria reflecting the nature and dynamics of the pathological process:
- By the scale of organ damage: partial (affecting individual functions) and total (general) failure are distinguished.
- By origin:
- Hepatocellular — caused by direct, primary damage to hepatocytes.
- Shunt-related — caused by hemodynamic disorders, when blood bypasses the liver without being cleared of toxins.
- By onset and course speed: acute and chronic.
- By reversibility: the pathology can be reversible (cells recover once the cause is eliminated) and irreversible.
Main etiological factors
The causes leading to the development of failure are divided into two large groups: extrahepatic and intrahepatic.
Extrahepatic causes are associated with systemic body dysfunctions:
- Systemic circulatory failure (e.g., in heart failure or massive chronic blood loss).
- General hypoxia of various origins.
- Chronic kidney disease (CKD).
- Endocrinopathies (parathyroid gland pathology, hypocortisolism).
- Hypovitaminosis and dysvitaminosis (specifically vitamins A, D, E).
Hepatic causes act directly within the organ's tissues:
- Local circulatory disorders.
- Various types of hepatitis and cirrhosis.
- Cholestasis (bile stasis).
- Tumor processes and dystrophies.
- Parasitic infestations.
- Hereditary liver disorders.
Key links in pathogenesis
The development of liver failure is a cascading process triggered by an etiological factor and mediated through five main mechanisms of damage:
- Direct modification and destruction of hepatocyte cell membranes.
- Activation of free radical reactions (oxidative stress).
- Development of an inflammatory process.
- Activation of immunopathological reactions.
- Release and activation of hydrolases (lysosomal destructive enzymes).
As a result of these five processes, massive tissue destruction occurs — necrosis or apoptosis of liver cells. The dying cells release active substances, forming a vicious circle: inflammation, immune attacks, and oxidative stress are further potentiated, aggravating the failure.
Impaired liver functions
Massive hepatocyte death leads to a critical decrease in the functional activity of the organ.
Impaired detoxification function The liver loses its ability to effectively neutralize poisons. The following rapidly accumulate in the blood:
- Endogenous toxins (absorbed from the intestine): ammonia, phenols, skatole, corpse poisons (putrescine, cadaverine), as well as pathogenic metabolic products — sulfated amino acids and low-molecular-weight fatty acids.
- Exogenous poisons: medicinal drugs, toxins of microorganisms and fungi, various toxic chemicals.
Impaired antimicrobial defense Local and systemic immunity decreases. This is due to a sharp drop in the activity of Kupffer cells (hepatic macrophages), which cease to phagocytose microorganisms. Concurrently, the synthesis of immunoglobulin A (IgA) and its transport into bile decrease, depriving the intestine of bactericidal and bacteriostatic defense.
Impaired bile formation and excretion Disruption in bile metabolism leads to jaundice and severe digestive disorders in the intestine.
Briefly: answers to topical questions
What specific digestive disorders occur with impaired bile formation?
Disruptions in bile formation and excretion (acholia) lead to impaired digestion and absorption of fats, as well as cavitary and membrane digestion. Main manifestations and consequences:
- Steatorrhea — excretion of undigested dietary fats with feces.
- Clay-colored stools — occur due to the absence of stercobilin.
- Polypolyhypovitaminosis — impaired absorption of fat-soluble vitamins (A, D, E, K), leading to bleeding and visual impairment.
- Intestinal disorders — development of dysbiosis, intestinal autoinfection, and intoxication.
What stages are distinguished in the development of hepatic encephalopathy?
Sources for acute liver failure indicate hepatic encephalopathy in the form of:
- Precoma — the prodromal (precomatose) period when elements of consciousness and complaints are still preserved.
- Coma — the stage of full-blown coma.
How does protein metabolism change in total liver failure?
The provided sources do not separately describe changes in protein metabolism specifically in total liver failure. For liver failure in general, impaired protein synthesis in the liver is indicated:
- Hypoproteinemia — a decrease in total protein, primarily due to albumins (hypoalbuminemia); it indicates severe pathology and failure of the synthetic function of the liver.
- Dysproteinemia — disturbance of the ratio of protein fractions; hypergammaglobulinemia is frequently observed.
- In hypoproteinemia, due to the decrease in albumins, the effective oncotic absorptive force of blood plasma decreases, contributing to the development of oncotic edema.
How does liver failure affect the hemostatic system?
Liver failure is associated with the development of hemorrhagic syndrome.
- Plasma clotting factors are synthesized in the liver and circulate in an inactive form.
- Among the factors specified in the sources, the following are synthesized in the liver: I — fibrinogen, II — prothrombin, V — proaccelerin, VII — proconvertin, IX — Christmas factor.
- Factors II, VII, and IX are produced in the liver with the participation of vitamin K.
- In acholia, impaired absorption of fat-soluble vitamin K leads to a deficiency of vitamin K-dependent clotting factors and hemorrhagic syndrome; vitamin K deficiency also decreases blood clotting rate and leads to hemorrhages.
To remember the 5 mechanisms of hepatocyte damage, use the acronym SLIVM: S — Free radicals (Svobodnye radikaly), L — Lysosomes (hydrolases), I — Immunopathology, V — Inflammation (Vospalenie), M — Membranes (destruction).
Class and exam questions
What is the fundamental difference between hepatocellular and shunt failure?
The hepatocellular form is caused by direct damage and death of the hepatocytes themselves. The shunt form occurs when hepatocytes may be relatively intact, but due to impaired blood flow, blood bypasses the liver and is not filtered.
Why is digestion impaired in liver failure?
This is directly related to impaired bile formation and bile excretion. A deficiency or absence of bile in the intestine disrupts fat digestion and absorption processes.
Which intestinal toxins affect the body during liver failure?
When detoxification is impaired, endogenous intestinal poisons enter the systemic circulation en masse: ammonia, phenols, skatole, putrescine, cadaverine, as well as low-molecular-weight fatty acids.
What else to study on this topic
- Mechanisms of vicious circle formation in hepatocyte necrosis
- The role of Kupffer cells in the antimicrobial function of the liver
- The link between hypovitaminosis (A, D, E) and the development of liver lesions
- Pathogenesis of jaundice in impaired bile secretory function
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