Cirrhosis Study Guide

📖 Core Concepts Cirrhosis – Irreversible replacement of normal liver parenchyma with fibrous scar and regenerative nodules. Compensated vs Decompensated – Compensated: liver can still perform most functions; decompensated: clinically evident complications (ascites, variceal bleed, encephalopathy, jaundice). Portal Hypertension – Elevated portal venous pressure caused by fibrotic resistance to sinusoidal flow; drives ascites, varices, splenomegaly. Hepatic Encephalopathy – Neuro‑cognitive dysfunction from ammonia & toxins that the diseased liver cannot clear. Staging Scores – Child‑Pugh (clinical + lab) classifies severity A‑C; MELD (bilirubin, INR, creatinine) predicts 90‑day mortality and transplant priority; MELD‑Na adds serum sodium. 📌 Must Remember AST > ALT, often AST : ALT > 2 → alcoholic liver disease. Ascites = sodium retention → low‑salt diet + spironolactone (first‑line). Variceal bleed prophylaxis: non‑selective β‑blocker or endoscopic band ligation. Encephalopathy treatment: lactulose ± rifaximin. MELD formula: $$\text{MELD}=3.78\ln[\text{bilirubin (mg/dL)}]+11.2\ln[\text{INR}]+9.57\ln[\text{creatinine (mg/dL)}]+6.43$$ Child‑Pugh points: bilirubin, albumin, PT/INR, ascites, encephalopathy (each 1‑3). Hepatorenal syndrome → median survival ≈ 2 weeks if untreated. Transplant priority = highest MELD (or MELD‑Na) score. Acetaminophen ≤ 2 g/day is safe in compensated cirrhosis. 🔄 Key Processes Fibrosis Development Chronic injury → hepatocyte death → activation of hepatic stellate cells → collagen deposition → fibrous septa → regenerative nodules. Portal Hypertension Cascade Fibrous septa ↑ sinusoidal resistance → portal pressure ↑ → splenomegaly, varices, ascites, caput medusae. Ascites Management Algorithm Salt restriction → spironolactone (aldosterone antagonist) ± furosemide → if refractory → therapeutic paracentesis + IV albumin → consider TIPS. Hepatic Encephalopathy Treatment Flow Identify precipitant → lactulose (titrate to 2–3 soft stools/day) → add rifaximin for recurrent episodes. Transplant Evaluation Decompensated disease (Class C/ MELD ≥ 15) → assess contraindications → list for transplant → prioritize by MELD‑Na. 🔍 Key Comparisons Compensated vs Decompensated Cirrhosis Compensated: no ascites/variceal bleed/encephalopathy; better prognosis. Decompensated: presence of any major complication; median survival < 3 years without transplant. Alcoholic vs NAFLD‑related Cirrhosis Alcoholic: AST > ALT, AST : ALT > 2, often low‑grade fever, malnutrition. NAFLD: associated with obesity, diabetes, dyslipidemia; ALT may be higher than AST. Child‑Pugh vs MELD Child‑Pugh: clinical (ascites, encephalopathy) + labs; coarse categories A‑C. MELD: purely lab‑based; continuous numeric score; better for transplant allocation. Spironolactone vs Loop Diuretic (Furosemide) Spironolactone: antagonizes aldosterone → first‑line for ascites; potassium‑sparing. Loop: added when diuresis inadequate; may cause hypokalemia. Beta‑Blocker vs TIPS for Varices β‑Blocker: non‑invasive, first‑line for primary prophylaxis. TIPS: reserved for refractory bleeding or contraindication to β‑blocker; may worsen encephalopathy. ⚠️ Common Misunderstandings “Normal PT = safe for procedures.” – PT reflects only clotting factor loss; patients may still have bleeding due to platelet dysfunction or low fibrinogen. “All acetaminophen is hepatotoxic.” – In recommended doses (≤ 2 g/day) it is safe in compensated cirrhosis. “Diuretics cure ascites.” – They control fluid but do not reverse underlying portal hypertension; relapse is common. “Low serum sodium is always beneficial.” – Hyponatremia in cirrhosis reflects impaired free‑water excretion and worsens prognosis; aggressive correction can cause osmotic demyelination. 🧠 Mental Models / Intuition “Scar‑back‑pressure” model – Think of the liver as a garden hose: fibrosis narrows the hose (sinusoids), raising upstream pressure (portal hypertension) → leaks (varices) and overflow (ascites). “Ammonia‑acidic gut” model – Lactulose creates an acidic colonic environment, trapping NH₃ as NH₄⁺ (non‑absorbable) → less systemic ammonia. “Score‑driven urgency” – Higher Child‑Pugh or MELD = higher urgency for transplant and more aggressive complication management. 🚩 Exceptions & Edge Cases MELD‑Na: Use when serum sodium < 135 mmol/L; improves mortality prediction. Hyponatremia: Treat with fluid restriction and, if severe, vasopressin‑V2 antagonists (e.g., tolvaptan) – but monitor for rapid shifts. Beta‑Blocker Contraindications: severe asthma, bradycardia, refractory hypotension. Spontaneous Bacterial Peritonitis (SBP) prophylaxis: Norfloxacin only for patients with prior SBP or low protein ascites (< 1.5 g/dL). Coagulopathy: Despite prolonged PT/INR, many cirrhotics are “rebalanced” – routine prophylactic plasma or platelets before low‑risk endoscopy is NOT recommended (AGA 2021). 📍 When to Use Which Start lactulose → any grade of encephalopathy; titrate to 2–3 soft stools/day. Add rifaximin → recurrent encephalopathy despite optimal lactulose. Non‑selective β‑blocker → primary prophylaxis of varices (size ≥ grade II) or secondary after bleed. Endoscopic band ligation → active variceal bleed or large varices when β‑blocker contraindicated. TIPS → refractory ascites, variceal bleed not controlled by β‑blocker/endoscopy, or as bridge to transplant. Spironolactone ± furosemide → all patients with new‑onset ascites; add loop only if inadequate response. Liver transplant → decompensated cirrhosis (Child‑Pugh C, MELD ≥ 15) or complications unresponsive to maximal medical therapy. 👀 Patterns to Recognize AST > ALT with ratio > 2 → alcoholic etiology. Spider angiomata + palmar erythema → chronic liver disease, high estrogen. Ascites + hyponatremia → advanced portal hypertension, poor prognosis. Asterixis (flapping tremor) → hepatic encephalopathy. Splenomegaly + thrombocytopenia → sequestration from portal hypertension. Elevated bilirubin + prolonged PT + low albumin → transition from compensated to decompensated. 🗂️ Exam Traps “Give fresh frozen plasma before any endoscopic procedure.” – AGA 2021 advises against routine plasma for stable cirrhotics; use only if severe coagulopathy with bleeding risk. “Acetaminophen is absolutely contraindicated.” – Low‑dose (≤ 2 g/day) is safe in compensated disease. “Normal albumin rules out decompensation.” – Albumin may stay normal early; look for clinical signs (ascites, encephalopathy). “All patients with varices need β‑blockers.” – Contraindications (asthma, hypotension) require band ligation or TIPS instead. “A high MELD automatically means transplant is indicated.” – Transplant candidacy also requires assessment of comorbidities, abstinence (alcohol), and psychosocial factors. “Hyponatremia is treated with normal saline.” – It worsens free‑water overload; treat with fluid restriction and, if needed, vaptans. --- Use this guide for a quick, high‑yield review right before the exam – focus on the bolded “must‑remember” facts and the decision‑tree style rules in “When to Use Which.” Good luck!