The liver fails silently for years — by the time you see jaundice and ascites, 80% of hepatocytes are already gone. Knowing which labs shift first changes everything.
Cirrhosis is irreversible scarring that replaces functional hepatocytes with fibrotic tissue, progressively destroying the liver's synthetic, metabolic, and detoxification capacity. Assessment focuses on two domains: physical findings and laboratory markers of liver function. Physical findings progress from subtle to obvious — early signs include fatigue, anorexia, and right upper quadrant dull aching; later signs include jaundice, ascites, spider angiomata, palmar erythema, caput medusae, and gynecomastia in males. Lab interpretation is where NCLEX questions live. The liver makes albumin and clotting factors, so expect decreased albumin (normal 3.5–5.0 g/dL) and prolonged PT/INR. Bilirubin rises (normal total 0.1–1.2 mg/dL) because the damaged liver can't conjugate or excrete it — producing jaundice when levels exceed approximately 2.5 mg/dL. AST and ALT elevate with hepatocyte destruction but may paradoxically normalize in end-stage cirrhosis when few hepatocytes remain to release enzymes. Ammonia rises because the failing liver can't convert it to urea, but ammonia monitoring and management belong to the hepatic encephalopathy sibling. Thrombocytopenia occurs from splenic sequestration due to portal hypertension. Always assess for bleeding tendencies — check gums, stool, and bruising.
Key Distinctions
Don't confuse elevated AST/ALT (hepatocyte damage markers) with albumin and PT/INR (synthetic function markers) — synthetic markers tell you how well the liver is actually working, while enzymes only tell you cells are dying. Students often think normalizing AST/ALT in cirrhosis means improvement; it can actually mean fewer living cells remain to release enzymes. Jaundice becomes visible at bilirubin around 2.5 mg/dL, not at the upper limit of normal.
Clinical Pearl
Enzymes tell you cells are dying; albumin and PT tell you the liver has stopped working. When enzymes drop but albumin and PT worsen — that's end-stage, not recovery.
Cirrhosis Complications
As the cirrhotic liver becomes fibrotic, blood backs up into the portal venous system, raising portal pressure above the normal 5–10 mmHg. This single mechanism drives most major complications. Esophageal varices form as collateral vessels dilate under pressure; rupture causes massive upper GI hemorrhage — the most immediately lethal complication. Ascites develops when portal hypertension combines with low albumin (reduced oncotic pressure) and sodium/water retention from secondary hyperaldosteronism. Third-spacing of fluid into the peritoneum can exceed several liters. Spontaneous bacterial peritonitis (SBP) occurs when ascitic fluid becomes infected without a surgical source; suspect it when a patient with ascites develops fever, abdominal pain, or worsening mental status. Paracentesis fluid with an absolute neutrophil count ≥250 cells/mm³ confirms SBP. Hepatorenal syndrome is progressive renal failure triggered by severe splanchnic vasodilation; urine output drops despite adequate volume, and it carries high mortality. Splenomegaly from portal congestion causes thrombocytopenia, increasing bleeding risk beyond what coagulopathy alone explains.
Key Distinctions
Don't confuse variceal bleeding (painless, massive hematemesis from portal hypertension) with peptic ulcer bleeding (epigastric pain, smaller volume). Students mix up SBP (infection of existing ascites, neutrophils ≥250) with secondary peritonitis (surgical perforation, multiple organisms). Hepatorenal syndrome looks like prerenal failure on labs but does not respond to fluid resuscitation — that distinction is highly testable.
Clinical Pearl
Think of portal hypertension as a backed-up highway: varices are the dangerous detours, ascites is the flooding, and SBP is infection in the floodwater.