1) Disease Description (Causes and Symptoms)
- Definition summary: Hepatic encephalopathy (HE) is a condition in which neurotoxic substances (primarily ammonia) accumulate due to impaired liver function, leading to deterioration in neurological and cognitive function. It ranges from mild cognitive impairment (functional decline) to coma.
- Summary of major causes and pathophysiology:
- Impaired liver function (chronic cirrhosis or acute liver failure) results in insufficient ammonia detoxification (the urea cycle) → increased blood ammonia levels.
- Precipitating factors include ammonia production by intestinal bacteria, gastrointestinal bleeding (protein load), constipation, infection, electrolyte abnormalities (such as low sodium), excessive diuresis, and impaired kidney function.
- Central nervous system mechanisms: changes in the blood-brain barrier, astrocyte swelling (glial degeneration), and combined changes in brain amines, the GABA system, and inflammatory mediators.
- Summary of major symptoms by stage:
- Early (mild): changes in the sleep-wake rhythm, reduced attention, mild personality/behavior changes, insomnia, impaired calculation and concentration (minimal cognitive impairment, minimal HE).
- Moderate: confusion about orientation and time, motor abnormalities (hand tremor/flapping tremor or asterixis), slurred speech and delayed responses, personality changes (violent or aggressive behavior).
- Severe: loss of orientation, requiring strong stimulation to open the eyes, coma, and risk of death due to respiratory failure or cerebral edema (particularly dangerous in acute liver failure).
2) Treatment Methods
- Basic principles: Identify and correct precipitating factors + reduce ammonia production and manage intracranial pressure (in acute situations).
- Immediate/acute treatment:
- Correct precipitating factors: Treat gastrointestinal bleeding; treat infections (especially SBP) with antibiotics; correct electrolyte abnormalities (especially low sodium and low potassium); correct dehydration and impaired kidney function; prohibit and discontinue sedatives, benzodiazepines, and opioids.
- When accompanied by acute liver failure: Secure the airway (in patients with impaired consciousness), manage cerebral edema (elevate the head, use hypertonic solutions or mannitol, etc.), and promptly evaluate for liver transplantation.
- Drug treatment (standard recommendations):
- Lactulose: A nonabsorbable disaccharide that acidifies the intestine → converts ammonia from NH3 to NH4+ and increases intestinal excretion. The goal is 2–3 soft bowel movements per day. The initial and maintenance doses should be adjusted for each patient (e.g., start with 20–30 g (30–45 mL) orally 2–3 times daily, then adjust).
- Rifaximin: A nonabsorbable broad-spectrum antibiotic used in combination with lactulose when control with lactulose is insufficient or to prevent recurrent hepatic encephalopathy (recommended dose: 550 mg orally twice daily).
- (Short-term alternatives) Neomycin and metronidazole: May be used to reduce intestinal bacteria, but long-term use is not recommended due to concerns about nephrotoxicity (neomycin) and neurotoxicity (metronidazole).
- Nutrition and lifestyle management:
- Excessive protein restriction is not recommended. Recommended protein intake is generally 1.2–1.5 g/kg/day (adjust according to nutritional and patient status). Consider branched-chain amino acid (BCAA) supplementation in cases of intolerance.
- Avoid alcohol and hepatotoxic supplements and herbal medicines (risk of toxicity).
- Prevent constipation and establish regular bowel movements (adjust lactulose or laxatives).
- Restriction of activities and driving: Do not drive or operate heavy machinery in cases of cognitive decline or recurrent HE.
- Long-term management:
- Recurrent HE: Continue maintenance lactulose therapy and consider adding rifaximin.
- Definitive treatment: Liver transplantation (to improve quality of life and prognosis in end-stage cirrhosis).
- Complications requiring attention:
- In acute coma: Airway obstruction and aspiration pneumonia, cerebral edema, worsening electrolyte and kidney function abnormalities, and recurrent hospitalization.
3) Checkpoints Before an Outpatient Visit (Including Items and Records to Prepare and Example Questions)
- Items to prepare/present:
- A list of currently used medications (including prescription drugs, OTC medicines, herbal medicines, and supplements), as well as administration times and doses
- A record of recent symptom changes (changes in consciousness, sleep patterns, aggression, bowel movement frequency/form)
- Recent test results (liver function tests (AST/ALT/total bilirubin/albumin/INR), kidney function (creatinine), electrolytes, blood tests, and records of recent abdominal ultrasound/CT/MRI)
- The dates and precipitating factors (e.g., bleeding or infection) of any previous HE episodes, and responses to treatment
- Recent hospitalization records and history of surgery, endoscopy, or blood transfusion
- Things to check yourself during the outpatient visit:
- Bowel movements: Number of bowel movements per day and stool consistency (hard stools = risk of constipation)
- Changes in sleep, daytime sleepiness, and concentration
- Side effects such as drowsiness or dizziness after taking medications
- Whether fever, abdominal pain, or jaundice has worsened
4) Examples of General Questions to Ask the Doctor
- What are the expected effects and side effects of this medication (e.g., lactulose or rifaximin)?
- What is my risk of recurrence, and what is my prognosis?
- How should I adjust my nutrition and protein intake? What should I do if I lose weight?
- Are there any medications I currently take (such as painkillers, sleeping pills, or antidepressants) that I should discontinue?
- What precautions should I take in daily life (driving, work, alcohol consumption, vaccinations, etc.)?
- Am I a candidate for liver transplantation, and when should the pre-transplant evaluation begin?
5) Examples of Disease-Specific Questions
- I have recently had bleeding (e.g., esophageal variceal bleeding). What additional measures should I take to reduce the risk of HE recurrence afterward?
- I have recurrent HE (recurrence two or more times within 3 months). Is long-term rifaximin therapy appropriate, and how is priority for liver transplantation evaluated?
The key treatments for hepatic encephalopathy are correcting precipitating factors and reducing intestinal ammonia with treatments such as lactulose and rifaximin. In acute liver failure, it can rapidly progress to cerebral edema and coma, so urgent specialized treatment and evaluation for liver transplantation are necessary. Carefully organizing the items to bring before an outpatient visit can make diagnostic and treatment planning more accurate.