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Autosomal dominant polycystic kidney disease (ADPKD) is an inherited condition that causes small, fluid-filled sacs called cysts to develop in the kidneys.
Although children affected by ADPKD are born with the condition, it rarely causes any noticeable problems until the cysts grow large enough to affect the kidneys' functions.
In most cases, this doesn't occur until a person is between 30 and 60 years of age. Less commonly, children or older people may have noticeable symptoms as a result of ADPKD.
When ADPKD reaches this stage, it can cause a wide range of problems, including:
Kidney function will gradually deteriorate until so much is lost that kidney failure occurs.
ADPKD is caused by a genetic fault that disrupts the normal development of some of the cells in the kidneys and causes cysts to grow.
Faults in one of two different genes are known to cause ADPKD. The affected genes are:
Both types of ADPKD have the same symptoms, but they tend to be more severe in PKD1.
A child has a one in two (50%) chance of developing ADPKD if one of their parents has the faulty PKD1 or PKD2 gene.
Autosomal recessive polycystic kidney disease (ARPKD) is a rarer type of kidney disease which can only be inherited if both parents carry the faulty gene and in this type problems usually start much earlier, during childhood.
In around one in four (25%) cases, a person develops ADPKD without having a known family history of the condition.
This could be because the condition was never diagnosed in a relative, or a relative with the condition may have died before their symptoms were recognised.
In around one in 10 cases of ADPKD, the mutation develops for the first time in the affected person. It's not known what causes this to happen.
The affected person can pass the faulty gene on to their children in the same way as someone who's inherited it from a parent (see above).
ADPKD is the most common inherited condition to affect the kidneys, although it's still relatively uncommon.
Only around one or two in every 1,000 people are born with ADPKD, which means there are currently around 60,000 people in the UK with the condition.
There's currently no cure for ADPKD, but various treatments are available to manage problems caused by the condition.
Most problems – such as high blood pressure, pain and UTIs – can be treated with medication, although you may need to have an operation to remove any large kidney stones that develop.
If the condition reaches a point where the kidneys aren't able to function properly, there are two main treatment options:
In some cases of ADPKD in adults (where chronic kidney disease is advanced and progressing rapidly), a medication called tolvaptan can be used to slow down the formation of cysts and protect kidney function.
Read more about treating ADPKD.
The outlook for ADPKD is highly variable. Some people experience kidney failure soon after the condition is diagnosed, whereas others may live the rest of their life with their kidneys working relatively well.
On average, around half of people with ADPKD require treatment for kidney failure by the time they're 60.
As well as kidney failure, ADPKD can also cause a number of other potentially serious problems, such as heart attacks and strokes caused by high blood pressure, or bleeding on the brain (subarachnoid haemorrhage) caused by a bulge in the wall of a blood vessel in the brain (brain aneurysm).
Read more about the complications of ADPKD.
If you have ADPKD, your clinical team will pass information about you on to the National Congenital Anomaly and Rare Diseases Registration Service (NCARDRS).
This helps scientists look for better ways to prevent and treat this condition. You can opt out of the register at any time.
The symptoms of autosomal dominant polycystic kidney disease (ADPKD) are caused by the growth of fluid-filled sacs (cysts) in the kidneys.
Although ADPKD is present from birth, it may not cause any obvious problems until the cysts have reached a size where they significantly affect how well your kidneys work. In most cases, this doesn't happen until 30 to 60 years of age.
The growth of the cysts can eventually cause your kidneys to increase in size. In some cases, the kidneys of older adults with ADPKD can be three or four times larger than those of adults who don't have the condition.
The growth of cysts in your kidneys can cause a wide range of problems, including:
These problems are described in more detail below.
Pain in the abdomen, side or lower back is often the first noticeable symptom of ADPKD. This can be severe, but is usually short-lived – lasting from a few minutes to several days.
Common causes of pain associated with ADPKD include:
Blood in your urine (haematuria) is another common initial symptom of ADPKD. Although it can often be a frightening symptom, it isn't usually a cause for concern and most cases will resolve within a week without the need for treatment.
However, you should go to see your GP if you notice blood in your urine so that other possible causes, such as a growth in your bladder, can be investigated and excluded.
Many experts consider high blood pressure to be the first effect of ADPKD but as it often doesn't cause any obvious symptoms, it's only usually detected during routine testing.
Symptoms only occur when blood pressure reaches a very high level, which is rare. In such circumstances, symptoms can include:
See your GP immediately if you experience these symptoms so that the cause can be investigated. Untreated or poorly controlled high blood pressure is a major risk factor for a number of serious health conditions including heart attack, stroke, and kidney failure.
Having ADPKD puts you at increased risk of developing kidney stones.
Smaller kidney stones may pass out of your kidneys without causing any symptoms, but larger stones can get blocked in your kidney or ureter (the tube that connects your kidney to your bladder), causing problems such as:
Contact your GP if you think you may have a kidney stone so they can try to find out what's causing your symptoms.
Urinary tract infections (UTIs) are broadly classified into one of two groups – lower UTIs and upper UTIs.
A lower UTI is an infection that develops in your bladder or urethra (the tube that carries urine out of the body). An upper UTI is an infection that develops in your kidneys or ureters (the tubes that link your kidneys to your bladder).
ADPKD doesn't increase your risk of developing lower UTIs such as bladder infections (cystitis), but it can mean that any lower UTIs you do develop could spread to your kidneys and become potentially serious upper UTIs.
Symptoms of a lower UTI can include:
Symptoms of an upper UTI can include:
Visit your GP if you have ADPKD and you think you may have a UTI. You may need treatment to stop the infection spreading into the cysts in your kidneys.
Most people with ADPKD will eventually lose a significant amount of kidney function. Loss of kidney function caused by kidney damage is known as chronic kidney disease (CKD).
CKD doesn't usually cause symptoms until it's reached an advanced stage, known as CKD stage 4 (when 75% of kidney function has been lost).
The most advanced stage of CKD (stage 5) is called kidney failure or end-stage renal disease. This is when dialysis (removal of waste products and excess fluid from the blood) is essential to keep the person alive.
Symptoms of kidney failure include:
Kidney failure rarely happens suddenly, and treatment options should have been discussed and a treatment plan chosen before this stage is reached.
Autosomal dominant polycystic kidney disease (ADPKD) tends to be diagnosed in adults over 30 years of age because symptoms don't usually start before then.
When making a diagnosis, your GP will ask about your symptoms and your family's medical history. If your kidneys are enlarged, your GP may be able to feel them in your tummy (abdomen).
Your GP may also arrange for some of the tests described below to be carried out.
Your GP will measure your blood pressure to see whether it's higher than normal. They may also carry out other tests, such as:
An effective way of assessing how well your kidneys are working is to calculate your glomerular filtration rate (GFR). GFR is a measure of how many millilitres (ml) of blood your kidneys are able to filter out waste products from in a minute. A healthy pair of kidneys should be able to filter more than 90ml of blood per minute.
Your GP will also arrange for you to have an ultrasound scan to look for cysts in your kidneys or other organs, such as your liver.
An ultrasound scan is a painless procedure where a small probe is passed across the skin over your kidneys. The probe emits high-frequency sound waves that are used to create an image of the inside of your body.
An MRI scan will be recommended if you have a family history of brain aneurysms. A brain aneurysm is a bulge in one of the blood vessels in the brain that's caused by a weakness in the blood vessel wall.
Read more about diagnosing brain aneurysms.
Screening people known to be at risk of developing ADPKD due to a family history of the condition is a controversial issue in the medical community.
Some argue that screening achieves little because there's currently no treatment to stop ADPKD developing.
Telling a person that they have ADPKD and are likely to develop kidney failure later in life could also cause them stress and anxiety.
Others argue that although you can't prevent ADPKD, screening can help identify cysts, and it's possible to treat the high blood pressure (hypertension) associated with ADPKD, which may reduce the person's risk of developing cardiovascular disease. If the diagnosis is known, complications won't come as a surprise and can be treated promptly and appropriately.
There's also now a treatment called tolvaptan that can slow the growth of cysts and may be beneficial in some cases.
If you're considering being screened for ADPKD, or having your children screened, you should discuss the advantages and disadvantages of screening with your GP, partner and family. You may also want to ask for a referral to see a kidney specialist.
Two methods can be used to confirm a diagnosis of ADPKD. They are:
It's important to be aware that neither test is entirely accurate and may not always detect ADPKD, even if you have the condition.
Imaging tests may miss very small cysts in younger people and will need to be repeated later in life. Genetic testing is more sensitive and accurate in diagnosing ADPKD but may be negative in 10% of people with ADPKD.
There's currently no cure for autosomal dominant polycystic kidney disease (ADPKD), and it isn't possible to stop cysts forming in the kidneys.
However, there are some potentially useful medications, such as tolvaptan, that can sometimes be used to reduce the growth rate of cysts (see below).
If you're diagnosed with ADPKD, you'll usually see a kidney specialist, who can help draw up a suitable treatment plan. The plan will also include what you would want to do if your kidneys stop working sufficiently (kidney failure).
Some of the main treatments are described below.
Medication is usually used to treat high blood pressure in people with ADPKD. Angiotensin-converting enzyme (ACE) inhibitors and angiotensin-2 receptor blockers (ARBs) are the two medications most widely used.
There are also some lifestyle changes you can make to help reduce your blood pressure, such as cutting your salt intake to less than 6g (0.2oz) a day (6g of salt is about one teaspoonful).
Read more about treating high blood pressure.
In many cases of ADPKD, any pain you experience can be relieved by treating the underlying cause, such as kidney stones or a urinary tract infection (UTI).
If you need to take a painkiller, paracetamol is the best medication to try first. If your pain is particularly severe, you may be prescribed a stronger painkiller, such as codeine or tramadol.
It's usually recommended that non-steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, are avoided because they could disrupt kidney function and interfere with medications prescribed to control your blood pressure. However, a short course of NSAIDs may sometimes be safe for people with well controlled blood pressure and relatively normal kidney function.
Occasionally, large cysts can be drained to help relieve the pain caused by the increased pressure.
Small kidney stones pass out of your body when you urinate. If needed, you may be given a strong painkiller and medication to stop you feeling sick or vomiting. Drinking plenty of water will increase the flow of urine, which will help flush the stone into the bladder.
If a kidney stone is too big to be passed naturally, you may need treatment to help remove it. Possible treatment options include:
Read more about treating kidney stones.
Urinary tract infections (UTIs) can often be treated with a seven to 14 day course of antibiotic tablets.
You should drink plenty of fluids while you're waiting for the antibiotics to take effect because it will help relieve a high temperature. Paracetamol can be used to relieve pain.
It's important to see your GP as soon as possible if you develop symptoms of a UTI, as it could spread to the cysts in your kidneys if left untreated.
Infection in the cysts is harder to cure because it can be difficult for the antibiotics to penetrate them. If the infection persists despite antibiotic treatment, the infected cysts may need to be drained during surgery or using a needle inserted through your skin.
If you have severe, persistent or frequently recurring UTIs, you may need surgery to remove one or both of your kidneys, followed by dialysis or a kidney transplant (see below).
You'll have blood tests at varying intervals to monitor your kidney function. You should discuss with your doctors what treatment you'd like if your condition reaches a stage where your kidneys stop working altogether (kidney failure).
The two main treatment options for kidney failure are:
You only need one kidney to survive. Therefore, unlike other types of organ donation, a living person can donate a kidney. Close relatives usually make the best match, so you may want to see if a relative would consider being tested to find out whether they're a suitable donor.
A few people with kidney failure decide not to have dialysis or a kidney transplant, preferring simple treatment of their symptoms. For example, a person may choose this option if it's unlikely that dialysis will significantly prolong their life or improve their quality of life. If this choice is made, supportive treatment to help control symptoms will be provided to make the end of life as comfortable as possible.
Tolvaptan is a medication that's recommended by the National Institute for Health and Care Excellence (NICE) to treat ADPKD in adults.
It can be used to slow down the growth of cysts, reducing overall kidney growth and preserving kidney function for longer. However, tolvaptan can only be used in adults who have:
Tolvaptan comes in tablet form and is taken twice a day as a split dose. Common side effects include:
Chemical-related liver damage (hepatotoxicity) has also been reported in some people taking tolvaptan for ADPKD.
If you're taking tolvaptan you'll need to initially be monitored frequently through hospital clinics.
You can read more about the use of tolvaptan for treating ADPKD on the NICE website.
Autosomal dominant polycystic kidney disease (ADPKD) can sometimes lead to potentially serious complications in other parts of the body besides the kidneys.
Some of the main complications associated with ADPKD are described below.
Many people with ADPKD develop cysts in other organs, as well as in their kidneys. The liver is also often affected by ADPKD.
Cysts that develop in the liver don't usually disrupt normal liver function, but they can sometimes become infected and/or cause symptoms such as:
In most cases, these symptoms will pass without the need for treatment. In rare cases, where a larger cyst causes severe or persistent pain, surgery may be required to drain the cyst.
Very rarely, the liver can become so massively swollen that it stops working properly. In such cases it may be necessary to surgically remove some of the liver or carry out a complete liver transplant.
CVD is a general term that refers to conditions that affect the heart and blood vessels and includes:
Read more about preventing CVD.
An aneurysm is a bulge in a blood vessel caused by a weakness in the blood vessel wall. As blood passes through the weakened part of the vessel, the blood pressure causes it to bulge outwards like a balloon.
Brain aneurysms are more common in people with ADPKD than those in the general population, probably because the high blood pressure affects the weakened blood vessel walls.
A brain aneurysm doesn't usually cause any noticeable symptoms unless it bursts (ruptures). A ruptured aneurysm causes bleeding over the surface of the brain. This is known as a subarachnoid haemorrhage.
Symptoms of a subarachnoid haemorrhage can include:
A subarachnoid haemorrhage is a medical emergency that requires immediate treatment to prevent serious complications, brain damage and death.
Dial 999 immediately and ask for an ambulance if you think that you or someone you know is having a subarachnoid haemorrhage.
It's estimated that around 10% of people with ADPKD will develop a brain aneurysm, but most won't have any symptoms and it will never cause a problem. People with ADKPD who also have a family history of subarachnoid haemorrhages are at greater risk.
If you have ADPKD and a family history of subarachnoid haemorrhages, you'll usually be offered a magnetic resonance angiography (MRA) scan to check for aneurysms in your brain. An MRA scan uses a magnetic field and radio waves to produce images of your arteries and the blood flow within them.
If no, or only small aneurysms are found, you'll be offered further scans at intervals of one to five years to check for new haemorrhages or an increase in the size of an existing one.
If an aneurysm of a particular size is detected, and your doctor thinks there's a risk it could rupture in the future, they may recommend that you have an operation or procedure to prevent this.
Read more about treating brain aneurysms.