Autosomal Recessive Polycystic Kidney Disease Arpkd

Overview

Autosomal recessive polycystic kidney disease (ARPKD) is a rare inherited condition that causes fluid-filled sacs called cysts to form in the kidneys and liver. The kidneys become enlarged and gradually lose their ability to filter waste from the blood. It is called 'recessive' because a child must inherit a changed gene from both parents. The condition is usually diagnosed in babies or young children, but some people may not notice symptoms until later in life.

ARPKD is rare. It affects about 1 in 20,000 to 1 in 40,000 births worldwide.

ARPKD can affect anyone, but most cases are found in infants and young children. It occurs in both boys and girls equally. In rare cases, people are not diagnosed until adolescence or adulthood.

Symptoms

Common symptoms

• Swollen or enlarged belly (abdomen) due to large kidneys
• High blood pressure
• Frequent urinary tract infections
• Pain in the back or sides
• Poor appetite and slow growth in children
• Feeling very thirsty or urinating often

Symptoms in children

• Breathing difficulties at birth because large kidneys press on the lungs
• Very large belly that feels firm to the touch
• Poor feeding and failure to grow or gain weight
• Signs of kidney failure, such as tiredness, pale skin, and puffiness around the eyes

Symptoms in older adults

• High blood pressure that starts early or is hard to control
• Tenderness or pain over the liver area (right upper belly)
• Symptoms related to liver scarring, such as swollen veins in the food pipe or an enlarged spleen
• Kidney stones or repeated urinary tract infections

Causes

Main causes

• ARPKD is caused by changes (mutations) in a gene called PKHD1.
• A child must inherit two copies of the changed gene, one from each parent.
• Parents who each carry one changed gene do not usually have symptoms themselves.

Risk factors

• Parents who are carriers of the PKHD1 gene change
• A family history of ARPKD
• Parents who are blood relatives (consanguinity) increases the chance of encountering the same gene change

When to see a doctor

See a doctor urgently if:

• If your child has a fever with pain in the side or back
• If you notice blood in your child's urine or your own urine
• If your child is suddenly very sleepy, confused, or difficult to wake
• If you have symptoms of a urinary tract infection that are worsening, such as burning when urinating or frequent urination

Book a routine appointment if:

• If your child is growing slowly or not feeding well
• If you have high blood pressure that does not improve with lifestyle changes
• If you have persistent discomfort or a feeling of fullness in the belly
• If you know you have a family history of kidney problems and want to discuss screening

Diagnosis

ARPKD is often suspected during pregnancy when an ultrasound shows enlarged kidneys, too little amniotic fluid, or sometimes very large kidneys in the baby. In other cases, doctors may suspect it after birth based on symptoms, or later in life if a person has high blood pressure or liver problems with no obvious cause.

Tests that may be done

• Ultrasound of the kidneys and liver to see cysts and organ size
• Genetic testing to look for changes in the PKHD1 gene
• Blood tests to check kidney function (creatinine and eGFR)
• Urine tests to check for protein or blood
• Liver function blood tests
• Magnetic resonance imaging (MRI) for more detail if needed

What to expect at your appointment

If your doctor suspects ARPKD, you will be referred to a specialist team. They will likely do a series of tests over several visits. You may need to repeat ultrasounds and blood tests to track how the kidneys and liver are doing. It is normal to feel anxious — ask questions and make sure you understand each step.

Treatment

There is no cure for ARPKD, but treatment focuses on managing symptoms, slowing kidney damage, and treating complications. Because the condition affects the kidneys and liver, your care team may include a kidney doctor, liver doctor, dietitian, and other specialists. The goal is to help you and your child feel as well as possible for as long as possible.

Self-care at home

• Take all medicines exactly as your doctor prescribes, even if you feel fine.
• Drink enough fluids to stay well hydrated unless your doctor advises otherwise.
• Monitor your blood pressure at home if your doctor recommends it.
• Keep regular appointments with your specialist team.
• Avoid medicines that can harm the kidneys, such as non-steroidal anti-inflammatory drugs (NSAIDs) — always ask your pharmacist or kidney doctor first.

Medical treatments

Treatment approaches may include blood pressure medicines (no specific brand, only as prescribed by your doctor), medicines to manage pain or infections, and treatments to help with liver complications. In some cases, growth hormone therapy may be considered for children who are not growing well. Dialysis or kidney transplant may be needed if the kidneys fail.

When is surgery considered?

Surgery is not needed for everyone. Some people may need a procedure to drain large cysts, or surgery to remove a kidney that causes severe symptoms. If the liver is seriously affected, a liver transplant might be considered. Your specialist team will discuss these options with you if they become relevant.

Living with this condition

Living with ARPKD means staying organized with medications, appointments, and monitoring. You may need to plan ahead for school, work, or travel to accommodate treatment. It is important to communicate openly with your healthcare team and family so everyone knows how to support you.

Lifestyle tips

• Stay physically active in ways that are comfortable for you.
• Avoid tobacco and limit alcohol to protect your kidneys and liver.
• Protect your kidneys by staying well hydrated and avoiding unnecessary medicines.
• Seek support early if you feel overwhelmed — mental health is part of living well.

Diet and exercise

Your dietitian may recommend a diet that is lower in salt, and in some cases lower in protein or potassium, depending on how well your kidneys are working. It is not a one-size-fits-all plan. Eating a balanced diet with plenty of fruits and vegetables is usually wise. Gentle exercise like walking or swimming is safe for most people, but check with your doctor before starting a new routine.

Mental health and emotional wellbeing

Living with a chronic condition like ARPKD can be emotionally challenging, both for the person affected and their family. Feelings of anxiety, sadness, or worry are common. It is okay to ask for help from a counselor, psychologist, or your healthcare team. Support groups can also help you connect with others who understand.

Prevention

ARPKD cannot be prevented because it is inherited. However, if you have a family history, you may consider genetic counseling before planning a pregnancy. A genetic counselor can help explain the risks and options, such as prenatal testing or preimplantation genetic diagnosis (PGD).

Vaccines

Staying up to date with routine vaccines, such as the flu vaccine and pneumonia vaccine, is especially important if you have kidney disease. Talk to your doctor about which vaccines are recommended for you.

Screening programmes

If you have a child with ARPKD, regular monitoring of blood pressure, kidney function, and liver health is essential. Brothers or sisters of an affected child may also be tested if symptoms appear, but not all siblings need screening unless they show signs.

Complications

If left untreated

• Kidney failure requiring dialysis or transplantation
• High blood pressure that damages the heart or blood vessels
• Liver scarring (fibrosis) leading to portal hypertension and varices (enlarged veins in the food pipe that can bleed)
• Severe infections in the kidneys or urinary tract
• Poor growth and development in children

Long-term outlook

The outlook for ARPKD varies widely. Some infants are severely affected, while others have a milder course. With careful medical care, many children survive into adulthood and live meaningful lives. If kidney failure occurs, transplantation is a successful option. Research and treatments are always improving, so there is reason for hope.

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