Hepatic Encephalopathy: Symptoms, Grades, and Treatment in Cirrhosis

Hepatic encephalopathy (HE) is a brain dysfunction caused by liver failure and portosystemic shunting — a spectrum ranging from subtle cognitive impairment detectable only on neuropsychological testing to deep unresponsive coma. It is the complication of cirrhosis that most visibly and distressingly affects patients and families, and one I manage intensively in my hepatology practice at Gleneagles Hospital, Mumbai. Understanding its mechanism, triggers, grading, and treatment is essential for both clinicians and caregivers.

What Causes Hepatic Encephalopathy?

The central mechanism is the accumulation of neurotoxins — particularly ammonia — that the diseased liver can no longer clear. In cirrhosis, two processes compound this:

• Impaired hepatic detoxification: Functioning liver cell mass is reduced, so less ammonia is converted to urea via the urea cycle.
• Portosystemic shunting: Blood bypasses the liver through natural collaterals or TIPS, delivering ammonia and other gut-derived toxins directly to the systemic circulation and brain.

Ammonia crosses the blood-brain barrier and causes astrocyte swelling (cerebral oedema), glutamine accumulation, neuroinflammation, and impaired neurotransmission. Gut dysbiosis — altered intestinal microbiota producing excess ammonia — is increasingly recognised as a modifiable driver of HE.

Types and Grading of Hepatic Encephalopathy

HE is classified by the underlying condition and by severity:

By Type

• Type A: Associated with acute liver failure — rapid onset, cerebral oedema, high mortality
• Type B: Due to portosystemic bypass without intrinsic liver disease
• Type C: Associated with cirrhosis — the most common form encountered in clinical practice

By Severity — West Haven Criteria

• Covert HE (Minimal HE + Grade 1): No obvious clinical manifestations; detected only by psychometric testing (number connection test, PHES battery) or critical flicker frequency. Affects 20–80% of cirrhotics and impairs driving ability, work performance, and quality of life.
• Grade 1 (Overt HE): Trivial lack of awareness, shortened attention span, altered sleep rhythm, mild asterixis
• Grade 2: Lethargy, disorientation, obvious personality change, asterixis easily elicited
• Grade 3: Somnolence, gross disorientation, bizarre behaviour, clonus, hyperreflexia
• Grade 4: Coma — unresponsive to painful stimuli

Precipitating Factors — Find and Fix the Trigger First

Over 80% of episodes of overt HE have an identifiable precipitant. Identifying and correcting the trigger is as important as treating the encephalopathy itself:

• Infections — particularly spontaneous bacterial peritonitis (SBP): always perform diagnostic paracentesis when HE develops in a patient with ascites
• Gastrointestinal bleeding: blood in the gut = ammonia load; treat urgently
• Constipation: increased colonic transit time → more ammonia absorption
• Dehydration and electrolyte disturbance: over-diuresis, vomiting, diarrhoea — especially hypokalaemia, which drives renal ammonia genesis
• Excessive dietary protein: now recognised as a minor trigger; protein restriction is outdated and harmful — cirrhotics are catabolic and need 1.2–1.5 g/kg/day protein
• Sedatives and opioids: benzodiazepines are particularly dangerous — they potentiate GABA-ergic neurotransmission already impaired by HE
• Renal impairment: hepatorenal syndrome or AKI sharply increases ammonia load
• TIPS placement: increases portosystemic shunting; HE develops in 10–50% post-TIPS
• Non-compliance with lactulose: the most common preventable cause of recurrence

Treatment of Hepatic Encephalopathy

Lactulose

Lactulose remains the first-line treatment for both acute episodes and secondary prophylaxis. It works by acidifying the colon (trapping ammonia as NH₄⁺, preventing absorption), reducing colonic transit time, and promoting ammonia-metabolising bacteria. Dose for acute HE: 30–45 mL every 1–2 hours until 2–3 soft stools per day, then titrate. For secondary prophylaxis: 15–30 mL twice daily. Lactulose enemas (300 mL in 700 mL water) are used when patients cannot take oral medication.

Rifaximin

Rifaximin is a gut-selective, minimally absorbed antibiotic that targets ammonia-producing intestinal bacteria. A landmark RCT (Bass et al., NEJM 2010) showed rifaximin 550 mg twice daily reduced HE recurrence by 58% and hospitalisation by 50% compared to placebo (on background lactulose). It is recommended as add-on therapy in patients who have a second breakthrough episode despite lactulose. Its gut microbiome modulating properties also reduce intestinal inflammation and dysbiosis. In my practice, rifaximin has transformed the management of recurrent HE — patients who were hospitalised 3–4 times per year have remained episode-free for years on lactulose + rifaximin.

Nutritional Support — Critical and Underused

The old instruction to restrict protein in HE patients is outdated and harmful. Current EASL 2018 guidelines recommend 1.2–1.5 g/kg/day of protein in cirrhotics, including during HE episodes. Branch-chain amino acids (BCAAs — leucine, isoleucine, valine) are particularly useful: they are metabolised peripherally rather than hepatically and compete with aromatic amino acids (which generate false neurotransmitters) for blood-brain barrier transport. Late evening snack (LES) — 200 kcal carbohydrate before bed — reduces overnight gluconeogenesis from muscle and is recommended for all cirrhotics. Sarcopenia worsens HE prognosis independently; preventing muscle loss is a therapeutic priority.

Zinc Supplementation

Zinc deficiency is near-universal in cirrhosis and impairs the urea cycle (zinc is a cofactor for urea cycle enzymes). Zinc supplementation (220 mg zinc sulphate twice daily) has shown benefit in some trials for covert HE and as adjunct therapy for overt HE. I routinely check zinc levels in patients with recurrent HE.

L-Ornithine L-Aspartate (LOLA)

LOLA provides substrates (ornithine and aspartate) for ammonia detoxification via the urea cycle and glutamine synthesis in muscle. IV LOLA has demonstrated benefit in acute HE in RCTs; oral LOLA is used as adjunct therapy. APASL guidelines include LOLA as a second-line option for HE management.

Liver Transplantation

Recurrent or persistent HE despite optimal medical therapy is a strong indication for liver transplantation evaluation. Post-transplant, HE resolves in the vast majority of patients as normal hepatic ammonia clearance is restored. Importantly, cognitive recovery may be incomplete if HE was prolonged or severe before transplant — early referral matters. I work with an experienced transplant team to evaluate patients with recurrent HE for listing, including international patients from the UK, UAE, USA, and Africa. See the liver transplant India guide for NRI patients for more information.

Frequently Asked Questions About Hepatic Encephalopathy

Is hepatic encephalopathy reversible?

Acute episodes of overt HE are usually fully reversible with treatment of the precipitant and ammonia-lowering therapy. However, recurrent episodes over years can lead to persistent cognitive impairment — so preventing recurrence is as important as treating acute episodes. Liver transplantation offers the best chance of full neurological recovery.

Can a patient with hepatic encephalopathy drive?

No. Even covert (minimal) HE impairs reaction times, attention, and spatial processing to a degree that significantly increases accident risk. Driving is contraindicated in all grades of HE. Patients should be counselled explicitly on this — many are unaware of the risk.

How long does hepatic encephalopathy last?

An acute episode with a correctable precipitant typically resolves within 24–72 hours with treatment. Patients who remain confused beyond 5–7 days despite therapy need reassessment for alternative diagnoses (Wernicke’s encephalopathy, subdural haematoma, CNS infection) and consideration of hepatorenal syndrome as a driver.

What foods should be avoided in hepatic encephalopathy?

No foods need to be completely avoided. Protein restriction is NOT recommended. Red meat generates more ammonia than vegetable protein or dairy, so some patients benefit from partially substituting animal protein with plant-based or dairy sources. Constipation should be avoided — adequate fluid and fibre intake matters. The priority is maintaining adequate total nutrition, not eliminating specific foods.

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Dr. Chetan Kalal is a DM Hepatologist (ILBS, New Delhi) and liver transplant physician at Gleneagles Hospital, Mumbai — the first DM Hepatologist of Maharashtra. ORCID: 0000-0002-5284-7890. For consultations including telemedicine, contact the clinic.