Hepatorenal and Hepatosplenic Syndromes

Hepatorenal syndrome (HRS)

Hepatorenal syndrome is a functional impairment of glomerular filtration. The kidneys themselves remain anatomically intact, but severe liver pathology (decompensated cirrhosis with ascites, acute fulminant hepatitis) leads to blood flow dysregulation.

Mechanism of development: Portal hypertension and decreased hepatic synthesis of angiotensinogen lead to redistribution of renal blood flow. Renal cortical ischemia occurs $\rightarrow$ glomerular filtration rate (GFR) drops. The disease follows a "vicious circle": acute renal failure (ARF) retains sodium and water, worsening ascites, while rising urea stimulates ammonia production, aggravating liver failure.

Triggering factors:

• Gastrointestinal bleeding (from esophageal varices).
• Massive diuretic therapy or removal of a large volume of ascites (paracentesis).
• Use of nephrotoxic drugs (NSAIDs, aminoglycosides) or alcohol excess.

The clinical picture is dominated by arterial hypotension, oliguria (up to anuria), and symptoms of hepatocellular failure. Blood tests reveal a disproportionately high concentration of urea (distinguishing it from other types of ARF), hyperkalemia, and hypochloremic alkalosis. The prognosis is fatal without restoration of liver function; therefore, the basis of patient management is prevention and caution with medications.

Hepatosplenic syndrome and hypersplenism

Hepatosplenic syndrome is combined enlargement of the liver (hepatomegaly) and spleen (splenomegaly). As a rule, one organ is primarily affected, and the second is involved secondarily. In 90% of cases, diffuse liver diseases (primarily cirrhosis) are the cause.

Other causes of enlargement of both organs:

• Granulomatoses: sarcoidosis, tuberculosis, schistosomiasis.
• Hemoblastoses: leukemias, lymphomas, polycythemia vera.
• Storage diseases: amyloidosis, Gaucher disease.
• Infections: sepsis, endocarditis (uniform organ enlargement).
• Blood stasis in heart failure (minimal spleen enlargement, without blood cell destruction).

In cirrhosis, spleen enlargement usually follows hepatomegaly, and the degree of its growth correlates with the severity of portal hypertension. Pain in the left upper quadrant indicates perisplenitis.

Hypersplenism syndrome Spleen enlargement is often accompanied by enhanced function—hypersplenism. Due to excessive destruction of formed blood elements, pancytopenia develops:

1. Anemia (decreased red blood cells).
2. Leukopenia (due to neutropenia).
3. Thrombocytopenia.

Paradoxically, the bone marrow shows compensatory hyperplasia of hematopoietic lineages. This helps distinguish hypersplenism from aplastic anemia (where the bone marrow is depleted) using puncture biopsy.

Cholestasis and cytolysis syndromes

These syndromes frequently accompany systemic liver lesions and present with distinct clinical and laboratory features.

Cholestasis syndrome is associated with impaired bile outflow.

• Symptom triad: striking obstructive jaundice, dark urine, acholia (clay-colored stools).
• Consequences of bile component retention: intense pruritus, lipid metabolism disorders (xanthomas and xanthelasmas due to sharp cholesterol elevation).
• Malabsorption: bile deficiency in the intestine impairs the absorption of fat-soluble vitamins, causing "night blindness" (vitamin A deficiency), osteomalacia (vitamin D), and bleeding tendencies (vitamin K).
• Biochemical blood analysis shows a sharp increase in direct bilirubin and alkaline phosphatase (ALP), while urobilin disappears from the urine (in complete obstruction). The final outcome of prolonged cholestasis is liver fibrosis.

Cytolytic syndrome reflects hepatocyte necrosis. Its severity is directly proportional to the intensity of inflammation. The main marker is an increase in ALT and AST enzymes (by 50–100 times in acute processes). Recovery is only possible if the underlying cause is eliminated.

Briefly: answers to topical questions

Class and exam questions

What else to study on this topic

• Pathogenesis of xanthomas and xanthelasmas in lipid metabolism disorders.
• Differential diagnosis of intrahepatic and extrahepatic cholestasis.
• Nosological forms of liver cirrhosis (primary biliary cholangitis, PSC, hemochromatosis).
• Mechanisms of blood flow dysregulation in portal hypertension.
• Features of electrolyte disturbances (hypochloremic alkalosis, hyperkalemia) in liver failure.

Other topics in the section "Liver, Biliary Tract, and Spleen"

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