Ascites

Key Points

• Ascites is the accumulation of fluid in the peritoneal cavity, most commonly caused by cirrhosis and portal hypertension.
• Portal hypertension increases hydrostatic pressure, driving fluid from hepatic and splanchnic circulation into the peritoneal space — resulting in concurrent hypovolemia despite visible abdominal distension.
• Nursing priorities: daily weight and abdominal girth measurement, sodium monitoring, respiratory support, and careful I&O tracking.
• Treatment includes sodium-restricted diet, diuretics, and paracentesis; advanced cases may require TIPS procedure.
• Inadequate respiratory effort from abdominal pressure is a high-priority complication requiring incentive spirometry and positioning.

Pathophysiology

Cirrhosis causes widespread hepatic fibrosis, increasing resistance to blood flow through the portal vein (portal hypertension). Elevated portal pressure drives fluid out of hepatic and splanchnic vessels into the peritoneal cavity. Simultaneously, reduced hepatic synthesis of albumin decreases plasma oncotic pressure, further promoting fluid transudation. The kidneys interpret decreased effective circulating volume and activate the renin-angiotensin-aldosterone system (RAAS), causing sodium and water retention — which perpetuates fluid accumulation in the peritoneum rather than restoring intravascular volume.

Additional causes: heart failure (right-sided), malignancy (peritoneal carcinomatosis), pancreatitis, and tuberculosis.

Nursing Assessment

NCLEX Focus

Ascites causes restrictive respiratory compromise — the elevated diaphragm impairs lung expansion. Respiratory assessment is a high-priority nursing action, not just abdominal assessment.

Physical examination findings:

• Abdominal distension and tenderness; shifting dullness and fluid wave on percussion
• Jaundice, spider angiomata, palmer erythema (signs of chronic liver disease)
• Peripheral edema (especially lower extremities)
• Muscle wasting (hepatic protein depletion)
• Tachypnea from diaphragmatic elevation limiting lung expansion

Monitoring parameters:

• Daily weight — most reliable measure of fluid accumulation and treatment response
• Abdominal girth — measured at the same landmark each time
• Serum sodium — hyponatremia common due to RAAS-driven water retention
• Vital signs and intake and output — detect hypovolemia, especially after paracentesis
• Respiratory status — SpO₂, breath sounds, work of breathing

Nursing Interventions

Respiratory support:

• Encourage use of incentive spirometer and cough-and-deep-breathing exercises to prevent pneumonia from impaired lung expansion
• Position for comfort and improved respiratory mechanics (semi-Fowler’s when in bed)
• Administer supplemental oxygen as ordered

Fluid and diet management:

• Sodium-restricted diet (typically 1,500–2,000 mg/day) — primary dietary intervention to limit fluid retention
• Coordinate with dietitian for individualized meal planning
• Diuretics (typically spironolactone ± furosemide) — reduce renal sodium retention; monitor potassium levels closely
• Restrict fluids if dilutional hyponatremia is present

Procedures:

• Paracentesis: percutaneous drainage of peritoneal fluid — performed periodically for symptomatic relief; monitor for post-procedural hypotension and monitor albumin replacement orders
• TIPS (Transjugular Intrahepatic Portosystemic Shunt): creates internal connection between portal and hepatic veins to reduce portal pressure in advanced disease

Patient education:

• Daily weight monitoring at home — report gain of >2 lb in 24 hours or >5 lb in one week
• Sodium restriction adherence and reading food labels
• Signs of infection (spontaneous bacterial peritonitis): fever, abdominal pain, altered mental status — seek emergency care

Spontaneous Bacterial Peritonitis (SBP)

Ascitic fluid is susceptible to bacterial infection. Fever, abdominal pain, and worsening encephalopathy in a cirrhotic patient should trigger immediate evaluation including diagnostic paracentesis for ascitic fluid cell count and culture.

Related Concepts

• digestive-system — Hepatic and portal vascular anatomy underlying ascites formation.
• abdominal-organ-enlargement-and-vascular-red-flags — Abdominal assessment and red flags for vascular complications.
• diuretics — Spironolactone and furosemide for sodium-water retention management in ascites.
• sodium-balance-disorders — Dilutional hyponatremia as a common electrolyte complication of ascites.
• fluid-volume-deficit-hypovolemia-and-dehydration — Effective hypovolemia despite total body fluid excess in ascites.
• constipation — Reduced gut motility and risk of constipation in cirrhotic patients with ascites.

Self-Check

1. Why does a client with ascites develop effective hypovolemia despite having excess total body fluid?
2. Which two measurements should the nurse document daily to monitor ascites progression and treatment response?
3. What symptoms should a client with ascites be taught to report immediately as possible signs of spontaneous bacterial peritonitis?