Why Does Liver Cirrhosis Cause Ascites?
Jun 07, 2022
Source: Cainiu Health
Dr. Jin Zhongkui
Introduction
Following liver cirrhosis, impaired hepatic function leads to fat accumulation and ascites formation. Additionally, decreased albumin levels compromise the body’s ability to maintain adequate nutritional support, as albumin serves as the primary carrier for most nutrients. When albumin levels fall, intravascular oncotic pressure decreases, causing fluid to shift from the bloodstream into the peritoneal cavity—resulting in ascites. Furthermore, persistent portal venous stasis fails to resolve, leading to portal hypertension. Significant fluid accumulation within the abdominal cavity causes distension; notably, hypoalbuminemia is the predominant underlying cause.
Today, many people’s dietary habits and daily routines are becoming increasingly irregular, which can weaken the immune system and trigger numerous diseases—particularly gastrointestinal disorders. Liver cirrhosis is one such condition. So, why does liver cirrhosis lead to ascites?
Why Does Liver Cirrhosis Cause Ascites?
Following cirrhosis, liver function declines, impairing fat metabolism and contributing to ascites formation. Additionally, reduced albumin synthesis diminishes the body’s capacity to retain fluid within blood vessels; since most nutrients rely on albumin for transport, low albumin levels cause fluid to shift from capillaries into the peritoneal cavity, resulting in ascites. Furthermore, impaired regeneration of the portal venous system leads to portal hypertension. This elevated pressure, combined with hypoalbuminemia—the primary underlying cause—results in significant fluid accumulation and swelling within the abdominal cavity. Inadequate food intake and malnutrition in cirrhotic patients activate the body’s protective mechanisms, causing sodium retention and further exacerbating ascites.
In cirrhosis, obstruction of portal venous return elevates pressure within the portal venous system and its capillaries, promoting transudation of fluid into the peritoneal cavity. Simultaneously, decreased hepatic synthesis of plasma albumin reduces plasma colloid osmotic pressure. Moreover, regenerative nodules compress post-sinusoidal venules, obstructing hepatic lymphatic drainage and increasing lymphatic pressure—leading to increased lymphatic leakage. These constitute the principal pathophysiological mechanisms of ascites. Additionally, heightened renal aldosterone and antidiuretic hormone (ADH) secretion further contribute to sodium and water retention.
If ascites develops secondary to liver cirrhosis, prompt medical treatment is essential to facilitate faster recovery. Patients should seek evaluation and management at a hospital’s Department of Gastroenterology. We hope this information proves helpful to you.
