Hepatic Veno Occlusive Disease

Overview

Hepatic veno-occlusive disease (VOD), also called sinusoidal obstruction syndrome (SOS), is a rare liver problem. The liver has tiny blood channels and small veins that carry blood through it. In VOD, these tiny vessels become swollen and blocked. Blood does not flow through the liver well, so the liver becomes congested and can swell. Fluid can build up in the belly, and waste products that the liver normally handles can build up in the blood. VOD is not a common illness, and it is not the same as alcohol-related liver disease. It is a serious condition that needs care from a medical team, especially when it happens after certain cancer treatments or a stem cell transplant.

VOD is uncommon in the general population. It is more likely in certain groups, especially people who have had a stem cell transplant or high-dose chemotherapy, but even in these groups most people do not get it.

VOD can affect children and adults. It is seen most often in people who have had a stem cell or bone marrow transplant, high-dose chemotherapy, or radiation to the liver area. It can also happen in people exposed to certain plant or herbal toxins, and sometimes in people with other liver problems. Your risk depends on your health, your treatments, and other factors your medical team can review with you.

Symptoms

Common symptoms

• Rapid weight gain from extra fluid, especially over a few days
• Swelling of the belly or legs
• A tender or enlarged liver
• Yellowing of the skin or the whites of the eyes (jaundice)
• Dark urine or pale stools
• Feeling sick, poor appetite, or vomiting
• Tiredness or weakness
• Passing less urine than usual
• Shortness of breath if fluid builds up around the lungs

Symptoms in children

• Rapid weight gain or a swollen belly
• Fewer wet nappies or less urine than usual
• Poor feeding or vomiting
• Irritability or unusual sleepiness
• Yellowing of the skin or eyes
• Bruising or bleeding more easily than usual

Symptoms in older adults

• Swelling of the belly or legs that may be mistaken for heart, kidney, or other liver problems
• New shortness of breath or tiredness
• Yellowing of the skin or eyes
• Confusion or unusual sleepiness, which can be a sign of serious illness
• Symptoms may be missed if you already have other health conditions, so tell your team about any new changes

Causes

Main causes

• Stem cell or bone marrow transplant, especially with certain conditioning treatments before the transplant
• High-dose chemotherapy or radiation therapy, particularly treatment that affects the liver
• Certain medicines that can harm the tiny blood vessels in the liver
• Exposure to certain plant toxins or herbal products that can injure the liver
• Sometimes after liver transplant or in people with other liver or blood vessel problems

Risk factors

• Having a stem cell transplant, especially from an unrelated donor or a second transplant
• High-dose chemotherapy or radiation before transplant
• Existing liver disease or previous liver injury
• Kidney problems or reduced kidney function
• Infection or fever around the time of treatment
• Use of certain medicines or herbal products that can affect the liver
• Being a child or older adult can affect how illness is monitored and noticed, but VOD can affect all ages

When to see a doctor

See a doctor urgently if:

• You notice rapid weight gain, new belly swelling, or new leg swelling
• Your skin or eyes look yellow
• You are passing much less urine than usual
• You have a fever after a transplant or chemotherapy
• You have new bruising, bleeding, or severe tiredness
• You have belly pain that is getting worse

Book a routine appointment if:

• You are recovering from a stem cell transplant or high-dose chemotherapy and want to know what to watch for
• You have mild swelling or weight changes and are unsure whether they matter
• You want to ask whether a herbal product, supplement, or medicine is safe for your liver
• You have questions about liver blood tests or follow-up scans

Diagnosis

There is no single simple test for VOD. Doctors make the diagnosis by putting together your medical history, your symptoms, a physical exam, blood tests, and imaging. They pay close attention to rapid weight gain, fluid buildup, liver size, and changes in liver blood tests. Because VOD can look like other liver, heart, or kidney problems, your team may check several things before deciding.

Tests that may be done

• Physical exam, including checking your weight, belly swelling, liver size, and signs of fluid buildup
• Blood tests to check liver function, kidney function, salts, and blood clotting
• Daily weights and fluid balance records, which help show fluid buildup
• Ultrasound of the liver and its blood vessels, often with Doppler to check blood flow
• Other imaging scans if your doctor needs more information
• In some cases, a liver biopsy or a test to measure pressure in the liver veins, done by a specialist

What to expect at your appointment

You may be seen by a liver specialist or a transplant care team. Diagnosis can take a little time because other conditions need to be ruled out. You may have repeated blood tests, weight checks, and ultrasound exams. Your team will explain each step and what the results mean for your care.

Treatment

Treatment for VOD focuses on supporting the liver and the rest of the body while the tiny blood vessels heal. The first step is often to recognize it early and to review any medicines or treatments that may be contributing. Many people need close monitoring in hospital, especially if they have had a transplant. Care is tailored to how severe the illness is and which organs are affected.

Self-care at home

• Follow your care team's advice about daily weight checks and fluid tracking
• Tell your team right away about new swelling, weight gain, yellowing skin, or less urine
• Avoid alcohol while your liver is healing
• Do not start herbal products, supplements, or new medicines without checking with your doctor or pharmacist
• Eat a balanced diet and follow any low-salt advice your team gives you
• Rest when needed and ask for help with daily tasks during recovery
• Keep all follow-up appointments and blood tests

Medical treatments

Doctors may use medicines that help improve blood flow in the liver or reduce clotting problems, but these are chosen by specialists and are not right for everyone. Treatment also includes managing fluids, treating pain or infection, giving nutrition support if needed, and watching kidney and lung function closely. In severe cases, care may take place in an intensive care unit. Some people need procedures to remove extra fluid, and very rarely a liver transplant may be considered. Your team will explain the options that fit your situation.

When is surgery considered?

Surgery is not a usual treatment for VOD. In rare severe cases, specialists may consider a procedure to drain extra fluid from the belly or, very rarely, a liver transplant. These decisions are made by a specialist team and depend on the person's overall health.

Living with this condition

Recovery from VOD can take time, and it varies a lot from person to person. Some people feel better within days or weeks with support, while others need a longer recovery. You may have regular check-ups, blood tests, and weight checks after you leave hospital. It helps to keep a simple record of symptoms, weight, and how much you are drinking and passing urine if your team asks you to.

Lifestyle tips

• Avoid alcohol until your doctor says it is safe
• Check with your doctor or pharmacist before taking any new medicine, herbal remedy, or supplement
• Keep your home safe and ask for help to prevent falls if you feel weak
• Wash your hands often and follow infection-prevention advice, especially after a transplant
• Stay connected with your care team and keep all appointments
• Pace yourself and build activity back slowly

Diet and exercise

There is no special diet that cures VOD. Your team may advise a lower-salt diet if you have fluid buildup, and a balanced diet with enough protein can help your body heal. Ask whether you need to limit fluids; do not restrict fluids on your own. Gentle movement, such as short walks, can help circulation and mood when you feel able. Your team can guide you on safe activity levels during recovery.

Mental health and emotional wellbeing

A serious liver problem and a hospital stay can be frightening for patients and families. It is normal to feel anxious, overwhelmed, or low. Talk with your care team about these feelings; they can connect you with a counsellor, social worker, or psychologist. If you feel in crisis or unsafe, contact your local emergency number or a local crisis support service right away. You do not have to cope alone.

Prevention

VOD cannot always be prevented, especially when it is linked to necessary transplant or cancer treatment. Care teams lower risk by checking liver health before high-risk treatment, choosing treatment plans carefully, monitoring weight and fluid balance, and watching for early signs. Avoid herbal products or plant-based remedies that are known to harm the liver, and always tell your doctor about anything you take.

Vaccines

No vaccine prevents VOD. After a transplant or certain treatments, your care team may recommend routine vaccines to prevent other infections. Ask your team which vaccines are safe and needed for you.

Screening programmes

There is no general screening test for VOD in the community. If you are having high-risk treatment, your team will monitor you closely with daily weights, fluid balance checks, blood tests, and ultrasound when needed. This monitoring helps spot problems early.

Complications

If left untreated

• Worsening liver failure
• Kidney problems or kidney failure
• Fluid buildup in the belly or around the lungs
• Breathing problems
• Bleeding problems or infection
• Serious illness affecting several organs

Long-term outlook

The outlook varies depending on how severe VOD is and how quickly it is recognized. Many people with mild VOD recover with careful support. Severe VOD is a serious illness, but early recognition and specialist care improve the chances of recovery. Some people need a longer recovery period and close follow-up. Your medical team can give you the most useful information about your own situation.

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