Hepatic Failure

Hepatic Failure

Overview

Liver has huge regenerative/functional reserve, but failure can occur: ACUTE (fulminant, sudden, massive necrosis) vs CHRONIC (advanced chronic disease, insidious). Prognosis WORSE in acute (counterintuitive — suddenness overwhelms compensation).

Etiology

ACUTE: MC=acute viral hepatitis. Others: hepatotoxic drugs (anaesthetics/NSAIDs/antidepressants), CCl4 poisoning, acute alcoholic hepatitis, mushroom poisoning, eclampsia.

CHRONIC: MC=cirrhosis. Others: chronic active hepatitis, chronic cholestasis, Wilson’s disease.

Manifestations (10, multi-system)

1. JAUNDICE — reflects damage severity. Acute: parallels damage extent. Chronic: LATE, mild.

2. HEPATIC ENCEPHALOPATHY (coma) — disturbed consciousness→personality change→intellectual deterioration→slurred speech→FLAPPING TREMOR→coma/death. Mechanism: undetoxified ammonia/nitrogenous gut-bacteria products reach brain. Poor prognosis advanced; may respond to transplant.

3. HYPERKINETIC CIRCULATION — peripheral vasodilatation, ↑splanchnic flow, ↑cardiac output, ↑splenic flow, but ↓RENAL blood flow → tachycardia, ↓BP, ↓renal function.

4. HEPATORENAL SYNDROME — renal failure w/o other cause, ~10% of liver disease. Oliguria+uraemia but GOOD tubular function, NORMAL kidney histology → FUNCTIONAL defect. Mechanism: effective hypovolaemia (systemic vasodilatation + portal pooling) → ↓renal blood flow. REVERSIBLE with hepatic recovery. Must exclude ATN first (KEY distinguishing fact: normal histology + reversibility = hepatorenal, not ATN).

5. HEPATOPULMONARY SYNDROME — chronic failure (cirrhosis): pulmonary vasodilatation + intrapulmonary AV shunting → V/Q mismatch → clubbing, ±cyanosis.

6. COAGULATION DEFECTS — ↓clotting factor synthesis → DIC, thrombocytopenia, fibrin degradation products.

7. ASCITES+OEDEMA — cirrhosis→portal HTN+ascites via 3 mechanisms: ↓albumin synthesis→hypoproteinaemia→↓oncotic pressure; ↑hydrostatic pressure (portal HTN); 2° hyperaldosteronism. (3 mechanisms = why diuretics alone often insufficient)

8. ENDOCRINE — mostly alcoholic cirrhosis, reproductive age. Male: FEMINISATION (gynaecomastia, hypogonadism). Female: gonadal/breast ATROPHY (not masculinisation). Mechanism: altered end-organ hormone sensitivity.

9. SKIN — alcoholic cirrhosis: ARTERIAL SPIDERS (SVC territory: neck/face/forearms/hands), less often PALMAR ERYTHEMA (thenar/hypothenar/finger pulps).

10. FOETOR HEPATICUS — sweetish pungent breath, severe hepatocellular disease. Intestinal origin — undetoxified sulfur compounds.

Clinical relevance

Acute-worse-than-chronic prognosis paradox = suddenness beats compensation, not about histologic severity. Hepatorenal syndrome’s defining pair (normal histology + reversibility) = THE way to distinguish from ATN. Endocrine+skin signs = most visually testable bedside clues, same altered-hormone-handling root. Ascites’ 3-mechanism structure = explains multi-drug approach needed (not diuretics alone).

Hepatic Failure

Overview

Liver has huge regenerative/functional reserve, but failure can occur: ACUTE (fulminant, sudden, massive necrosis) vs CHRONIC (advanced chronic disease, insidious). Prognosis WORSE in acute (counterintuitive — suddenness overwhelms compensation).

Etiology

ACUTE: MC=acute viral hepatitis. Others: hepatotoxic drugs (anaesthetics/NSAIDs/antidepressants), CCl4 poisoning, acute alcoholic hepatitis, mushroom poisoning, eclampsia.

CHRONIC: MC=cirrhosis. Others: chronic active hepatitis, chronic cholestasis, Wilson’s disease.

Manifestations (10, multi-system)

1. JAUNDICE — reflects damage severity. Acute: parallels damage extent. Chronic: LATE, mild.

2. HEPATIC ENCEPHALOPATHY (coma) — disturbed consciousness→personality change→intellectual deterioration→slurred speech→FLAPPING TREMOR→coma/death. Mechanism: undetoxified ammonia/nitrogenous gut-bacteria products reach brain. Poor prognosis advanced; may respond to transplant.

3. HYPERKINETIC CIRCULATION — peripheral vasodilatation, ↑splanchnic flow, ↑cardiac output, ↑splenic flow, but ↓RENAL blood flow → tachycardia, ↓BP, ↓renal function.

4. HEPATORENAL SYNDROME — renal failure w/o other cause, ~10% of liver disease. Oliguria+uraemia but GOOD tubular function, NORMAL kidney histology → FUNCTIONAL defect. Mechanism: effective hypovolaemia (systemic vasodilatation + portal pooling) → ↓renal blood flow. REVERSIBLE with hepatic recovery. Must exclude ATN first (KEY distinguishing fact: normal histology + reversibility = hepatorenal, not ATN).

5. HEPATOPULMONARY SYNDROME — chronic failure (cirrhosis): pulmonary vasodilatation + intrapulmonary AV shunting → V/Q mismatch → clubbing, ±cyanosis.

6. COAGULATION DEFECTS — ↓clotting factor synthesis → DIC, thrombocytopenia, fibrin degradation products.

7. ASCITES+OEDEMA — cirrhosis→portal HTN+ascites via 3 mechanisms: ↓albumin synthesis→hypoproteinaemia→↓oncotic pressure; ↑hydrostatic pressure (portal HTN); 2° hyperaldosteronism. (3 mechanisms = why diuretics alone often insufficient)

8. ENDOCRINE — mostly alcoholic cirrhosis, reproductive age. Male: FEMINISATION (gynaecomastia, hypogonadism). Female: gonadal/breast ATROPHY (not masculinisation). Mechanism: altered end-organ hormone sensitivity.

9. SKIN — alcoholic cirrhosis: ARTERIAL SPIDERS (SVC territory: neck/face/forearms/hands), less often PALMAR ERYTHEMA (thenar/hypothenar/finger pulps).

10. FOETOR HEPATICUS — sweetish pungent breath, severe hepatocellular disease. Intestinal origin — undetoxified sulfur compounds.

Clinical relevance

Acute-worse-than-chronic prognosis paradox = suddenness beats compensation, not about histologic severity. Hepatorenal syndrome’s defining pair (normal histology + reversibility) = THE way to distinguish from ATN. Endocrine+skin signs = most visually testable bedside clues, same altered-hormone-handling root. Ascites’ 3-mechanism structure = explains multi-drug approach needed (not diuretics alone).

Hepatic Failure

Overview

Despite the liver’s marked regenerative capacity and large functional reserve, hepatic failure may develop either from severe acute/fulminant liver injury with massive hepatocyte necrosis (acute hepatic failure) or from advanced chronic liver disease (chronic hepatic failure). Acute failure develops suddenly with severe functional impairment; chronic failure develops insidiously. Prognosis is considerably worse in acute hepatic failure than chronic.

Etiology

Acute (fulminant) hepatic failure — most frequently from acute viral hepatitis. Other causes: hepatotoxic drug reactions (anaesthetic agents, NSAIDs, antidepressants), carbon tetrachloride poisoning, acute alcoholic hepatitis, mushroom poisoning, pregnancy complicated by eclampsia.

Chronic hepatic failure — most often from cirrhosis. Other causes: chronic active hepatitis, chronic cholestasis (cholestatic jaundice), Wilson’s disease.

Manifestations

Given the liver’s diverse functions, hepatic failure produces complex, multi-system manifestations:

1. Jaundice — reflects severity of liver cell damage (failure to metabolise bilirubin). In acute failure (e.g. viral hepatitis), jaundice nearly parallels the extent of liver cell damage; in chronic failure (e.g. cirrhosis), it appears late and is usually mild.

2. Hepatic encephalopathy (hepatic coma) — a neuropsychiatric syndrome complicating both acute and chronic disease: disturbed consciousness, personality changes, intellectual deterioration, low slurred speech, flapping tremors, progressing to coma and death. Genesis: toxic products (ammonia and other nitrogenous substances from intestinal bacteria) reach systemic circulation without hepatic detoxification, damaging the brain. Advanced hepatic coma has poor prognosis but may respond to hepatic transplantation.

3. Hyperkinetic circulation — peripheral vasodilatation, increased splanchnic blood flow, increased cardiac output, increased splenic flow, but reduced renal blood flow (impaired renal cortical perfusion) → tachycardia, low blood pressure, reduced renal function.

4. Hepatorenal syndrome — renal failure developing in patients with acute or chronic hepatic failure, in the absence of other identifiable cause of renal dysfunction; occurs in ~10% of acute and chronic liver disease cases. Acute renal failure with oliguria and uraemia but good tubular function; kidney histology is virtually normal, pointing to a functional rather than structural defect. Pathogenesis (poorly understood): effective reduction of renal blood flow (effective hypovolaemia) from systemic vasodilatation and portal-circulation blood pooling. Reversible with improvement in hepatic function. Diagnosis requires excluding other causes of concomitant organ damage (e.g. circulatory failure causing acute tubular necrosis).

5. Hepatopulmonary syndrome — in chronic hepatic failure (e.g. cirrhosis): pulmonary vasodilatation with intrapulmonary arteriovenous shunting → ventilation-perfusion mismatch → impaired pulmonary function, finger clubbing, sometimes cyanosis.

6. Coagulation defects — impaired hepatic synthesis of coagulation factors → disseminated intravascular coagulation (consumption coagulopathy), thrombocytopenia, circulating fibrin degradation products.

7. Ascites and oedema — chronic liver failure (cirrhosis) → portal hypertension + ascites. Contributing factors: decreased hepatic albumin synthesis → hypoproteinaemia → reduced plasma oncotic pressure; increased hydrostatic pressure from portal hypertension; secondary hyperaldosteronism.

8. Endocrine changes — more common in alcoholic cirrhosis, active reproductive age. Males: feminisation — gynaecomastia, hypogonadism. Females: gonadal/breast atrophy (rather than masculinisation). Mechanism: altered end-organ sensitivity to sex hormones in cirrhosis.

9. Skin changes — in alcoholic cirrhosis, arterial spiders (radiating vessels from a central arteriole) occur frequently in the SVC drainage territory (neck, face, forearms, hand dorsum). Less frequently, palmar erythema (hypothenar/thenar eminences, finger pulps).

10. Foetor hepaticus — sweetish, pungent breath odour in severe acute/chronic hepatocellular disease; appears to be of intestinal origin, from failure to detoxify absorbed sulfur-containing substances.

Clinical Relevance

• The acute-vs-chronic prognosis asymmetry (acute worse despite chronic disease being “more advanced” by definition) is counterintuitive and worth flagging — it reflects the suddenness overwhelming compensatory capacity, rather than severity of underlying histologic damage.
• Hepatorenal syndrome’s defining feature — normal renal histology plus reversibility with hepatic recovery — is the key distinguishing fact from acute tubular necrosis, and is the reasoning basis for excluding ATN before diagnosing hepatorenal syndrome.
• The endocrine and skin manifestations (gynaecomastia, arterial spiders, palmar erythema) are the most visually testable/recognisable bedside signs of chronic hepatic failure and are worth linking back to the same altered-hormone-handling mechanism rather than memorising as separate facts.
• Ascites’ three contributing mechanisms (hypoalbuminaemia, portal hypertension, secondary hyperaldosteronism) together explain why diuretics alone are often insufficient — each mechanism needs its own corrective approach.

Hepatic Failure

Overview

Despite the liver’s marked regenerative capacity and large functional reserve, hepatic failure may develop either from severe acute/fulminant liver injury with massive hepatocyte necrosis (acute hepatic failure) or from advanced chronic liver disease (chronic hepatic failure). Acute failure develops suddenly with severe functional impairment; chronic failure develops insidiously. Prognosis is considerably worse in acute hepatic failure than chronic.

Etiology

Acute (fulminant) hepatic failure — most frequently from acute viral hepatitis. Other causes: hepatotoxic drug reactions (anaesthetic agents, NSAIDs, antidepressants), carbon tetrachloride poisoning, acute alcoholic hepatitis, mushroom poisoning, pregnancy complicated by eclampsia.

Chronic hepatic failure — most often from cirrhosis. Other causes: chronic active hepatitis, chronic cholestasis (cholestatic jaundice), Wilson’s disease.

Manifestations

Given the liver’s diverse functions, hepatic failure produces complex, multi-system manifestations:

1. Jaundice — reflects severity of liver cell damage (failure to metabolise bilirubin). In acute failure (e.g. viral hepatitis), jaundice nearly parallels the extent of liver cell damage; in chronic failure (e.g. cirrhosis), it appears late and is usually mild.

2. Hepatic encephalopathy (hepatic coma) — a neuropsychiatric syndrome complicating both acute and chronic disease: disturbed consciousness, personality changes, intellectual deterioration, low slurred speech, flapping tremors, progressing to coma and death. Genesis: toxic products (ammonia and other nitrogenous substances from intestinal bacteria) reach systemic circulation without hepatic detoxification, damaging the brain. Advanced hepatic coma has poor prognosis but may respond to hepatic transplantation.

3. Hyperkinetic circulation — peripheral vasodilatation, increased splanchnic blood flow, increased cardiac output, increased splenic flow, but reduced renal blood flow (impaired renal cortical perfusion) → tachycardia, low blood pressure, reduced renal function.

4. Hepatorenal syndrome — renal failure developing in patients with acute or chronic hepatic failure, in the absence of other identifiable cause of renal dysfunction; occurs in ~10% of acute and chronic liver disease cases. Acute renal failure with oliguria and uraemia but good tubular function; kidney histology is virtually normal, pointing to a functional rather than structural defect. Pathogenesis (poorly understood): effective reduction of renal blood flow (effective hypovolaemia) from systemic vasodilatation and portal-circulation blood pooling. Reversible with improvement in hepatic function. Diagnosis requires excluding other causes of concomitant organ damage (e.g. circulatory failure causing acute tubular necrosis).

5. Hepatopulmonary syndrome — in chronic hepatic failure (e.g. cirrhosis): pulmonary vasodilatation with intrapulmonary arteriovenous shunting → ventilation-perfusion mismatch → impaired pulmonary function, finger clubbing, sometimes cyanosis.

6. Coagulation defects — impaired hepatic synthesis of coagulation factors → disseminated intravascular coagulation (consumption coagulopathy), thrombocytopenia, circulating fibrin degradation products.

7. Ascites and oedema — chronic liver failure (cirrhosis) → portal hypertension + ascites. Contributing factors: decreased hepatic albumin synthesis → hypoproteinaemia → reduced plasma oncotic pressure; increased hydrostatic pressure from portal hypertension; secondary hyperaldosteronism.

8. Endocrine changes — more common in alcoholic cirrhosis, active reproductive age. Males: feminisation — gynaecomastia, hypogonadism. Females: gonadal/breast atrophy (rather than masculinisation). Mechanism: altered end-organ sensitivity to sex hormones in cirrhosis.

9. Skin changes — in alcoholic cirrhosis, arterial spiders (radiating vessels from a central arteriole) occur frequently in the SVC drainage territory (neck, face, forearms, hand dorsum). Less frequently, palmar erythema (hypothenar/thenar eminences, finger pulps).

10. Foetor hepaticus — sweetish, pungent breath odour in severe acute/chronic hepatocellular disease; appears to be of intestinal origin, from failure to detoxify absorbed sulfur-containing substances.

Clinical Relevance

• The acute-vs-chronic prognosis asymmetry (acute worse despite chronic disease being “more advanced” by definition) is counterintuitive and worth flagging — it reflects the suddenness overwhelming compensatory capacity, rather than severity of underlying histologic damage.
• Hepatorenal syndrome’s defining feature — normal renal histology plus reversibility with hepatic recovery — is the key distinguishing fact from acute tubular necrosis, and is the reasoning basis for excluding ATN before diagnosing hepatorenal syndrome.
• The endocrine and skin manifestations (gynaecomastia, arterial spiders, palmar erythema) are the most visually testable/recognisable bedside signs of chronic hepatic failure and are worth linking back to the same altered-hormone-handling mechanism rather than memorising as separate facts.
• Ascites’ three contributing mechanisms (hypoalbuminaemia, portal hypertension, secondary hyperaldosteronism) together explain why diuretics alone are often insufficient — each mechanism needs its own corrective approach.

Hepatic Failure

• Central “hepatic failure” node radiating out to all ten manifestations, grouped by organ system affected
• Ascites pathogenesis triangle: hypoalbuminaemia + portal hypertension + secondary hyperaldosteronism converging on fluid accumulation

Hepatic Failure

• Central “hepatic failure” node radiating out to all ten manifestations, grouped by organ system affected
• Ascites pathogenesis triangle: hypoalbuminaemia + portal hypertension + secondary hyperaldosteronism converging on fluid accumulation