AI Summary Bacterial infections are found in more than half of people when hepatic encephalopathy first appears, and finding and treating triggers such as infection, bleeding, or constipation often resolves a severe episode.
Medically reviewed.
Grade III hepatic encephalopathy (HE) is a severe point on the West Haven scale doctors use to grade HE, a decline in brain function caused by advanced liver disease. At grade III, a person is markedly confused and grossly disoriented, may have slurred speech, and is drowsy and hard to wake, though they still respond to stimulation.
Grade III and grade IV HE are together described as "brain failure." A Glasgow Coma Scale (GCS) score under 8 signals severe injury at this stage. Patients with severe HE need transfer to an intensive care unit (ICU) for airway protection, often with intubation and mechanical ventilation.
This page explains what grade III looks like, what to do in an emergency, how hospitals treat it, common triggers, and what it means for outlook and liver transplant.
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Where Grade III Fits
Doctors grade hepatic encephalopathy (HE) using the West Haven criteria, a bedside mental status and neurological exam that runs from Grade 0, with no detectable symptoms, to Grade IV, coma. Grade III is the second most severe stage. The person is markedly confused and grossly disoriented, may slur their words, and is lethargic and difficult to arouse.
Grade III and grade IV HE are together described as "brain failure." A Glasgow Coma Scale (GCS) score under 8 signals severe brain injury at this stage. Because a person with severe HE is at risk of inhaling stomach contents into the lungs (aspiration), grade III calls for transfer to an intensive care unit (ICU) for airway protection, often with intubation and mechanical ventilation.
Grade III is a medical emergency, but it is not necessarily permanent. Many episodes are triggered by an identifiable and treatable event, such as an infection or gastrointestinal bleeding, and can improve once the trigger is treated and toxins are cleared from the blood. Recovery depends on how quickly the trigger is found and on the person's overall liver function.
If someone with liver disease becomes very confused, hard to wake, or cannot answer simple questions, treat it as a medical emergency.
Key Terms
A few terms come up often when talking about severe hepatic encephalopathy.
Hospital and ICU Care
Grade III and grade IV HE ("brain failure") call for intensive care unit admission. Care follows a few consistent priorities.
Severe HE puts a person at risk of aspiration pneumonia. The care team may place a breathing tube and connect it to a ventilator. This protects the lungs and lets the team manage the person safely while treating the underlying cause.
If sedation is needed during intubation or ventilation, teams typically use short-acting agents such as propofol or dexmedetomidine, and try to avoid or minimize benzodiazepines and opioids when possible.
The care team searches for and treats what triggered the episode — an infection, gastrointestinal bleeding, constipation, or the use of sedatives and diuretics — because resolving the trigger often leads to improvement in HE.
Alongside treating the trigger, the team starts HE-specific therapy, typically lactulose (given rectally in hospitalized patients who cannot take medication by mouth) or polyethylene glycol, to help clear ammonia and other toxins from the gut.
What Can Trigger It
Identifying and treating the trigger is a cornerstone of HE care: resolving the underlying cause often leads to improvement, even after a severe episode.
Outlook and Transplant
Grade III is serious, but many episodes are reversible once the trigger is treated and toxins clear.
Outlook after a grade III episode depends on how quickly the trigger is found and treated, and on the person's overall liver function. HE is often reversible when people get help early, though recovery can take time.
To help prevent another episode, lactulose is often continued long term. Rifaximin (Xifaxan) may be added for people who have had at least one recurrence while on lactulose alone. Together they lower the risk of further HE episodes and related hospital stays.
Recurrent or persistent overt HE that does not respond to medical therapy is linked to a poor survival outlook. HE is recognized as a "MELD exception" because the lab-based MELD score — the standard measure of transplant urgency — often underestimates how urgent HE-related illness is.
Liver transplantation is considered for people whose hepatic encephalopathy keeps coming back or does not improve with medical treatment. If you or a family member has had a severe HE episode, ask your liver team whether a transplant evaluation is appropriate.
Nutrition Support
During a grade III episode, a very drowsy person cannot eat or drink safely, so food and drink are not part of emergency care at home. The hospital team manages nutrition while it treats the trigger.
Once the person is medically stable, nutrition becomes part of preventing another severe episode. Malnutrition and muscle loss (sarcopenia) are independent risk factors for HE. Doctors also weigh nutritional status when they decide whether preventive HE therapy can stop. Talk with your liver team or a registered dietitian about a plan that fits you.
Nutrition Targets Used Alongside Medical Treatment
Grade III hepatic encephalopathy is a severe stage on the West Haven scale, the exam doctors use to grade HE from 0 to IV. The person is markedly confused and grossly disoriented, may slur their words, and is drowsy and hard to wake, though they still respond to stimulation. Grade III and grade IV are together called "brain failure." It is less deep than grade IV coma, but it still needs urgent hospital care.
Yes. Treat it as a medical emergency and call 911 or go to the nearest emergency room. Do not wait to see if it improves. Do not give food, drink, or medication by mouth, because a very drowsy person can choke or breathe it into the lungs. Stay with the person. Note when the change started and any recent fever, bleeding, new medicine, or missed HE medication dose, since this helps the care team find the trigger.
Doctors diagnose overt HE mainly from the person's mental status and movement on exam, not from one lab result. Signs include confusion, slurred speech, lethargy, and gross disorientation. The team also uses the person's history, blood tests, ammonia levels, and sometimes CT or MRI scans to look for the trigger and rule out other causes. A Glasgow Coma Scale score under 8 signals severe brain injury.
Often, yes. Patients with severe HE (grade III or higher) are transferred to an intensive care unit. The reason is airway protection: a very drowsy person can inhale stomach contents, which causes aspiration pneumonia. The team may place a breathing tube and use a ventilator. If sedation is needed, they typically choose short-acting agents such as propofol or dexmedetomidine and try to avoid benzodiazepines and opioids, which can worsen confusion.
Yes, grade III can often be reversed. The main step is finding and treating the trigger, such as an infection, bleeding, constipation, or a sedating medicine, because resolving it often leads to improvement. The team also starts HE-specific treatment such as lactulose, which can be given rectally if the person cannot swallow. Recovery time varies with how fast the trigger is treated and how well the liver is working.
Bacterial infections are the most important trigger, since they are found in more than half of people when HE first appears. Other common triggers include gastrointestinal bleeding, constipation, dehydration or too much diuretic, and sedatives or opioids. Missed doses of lactulose or rifaximin, kidney problems, alcohol use, and large portosystemic shunts can also play a role. Contact your liver team early if you have a fever, bleeding, or new confusion.
Lactulose is often continued long term to prevent another episode, and rifaximin can be added if HE returns while on lactulose alone. Transplant is considered when overt HE keeps coming back or does not respond to medical treatment, because that pattern is linked to a poor survival outlook. HE is also recognized as a "MELD exception," since the lab-based MELD score can underestimate urgency. Ask your liver team whether a transplant evaluation is right for you.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.
