Autosomal Dominant Polycystic Kidney Disease
What is autosomal dominant PKD?
Autosomal dominant polycystic kidney disease (ADPKD) is the most common form of PKD. ADPKD affects 1 in every 400 to 1,000 people and is the most common kidney disorder passed down through family members.4 Health care providers usually diagnose ADPKD between the ages of 30 and 50, when signs and symptoms start to appear, which is why it is sometimes called “adult PKD.”5
“Autosomal dominant” means you can get the PKD gene mutation, or defect, from only one parent. Researchers have found two different gene mutations that cause ADPKD. Most people with ADPKD have defects in the PKD1 gene, and 1 out of 6 or 1 out of 7 people with ADPKD have a defective PKD2 gene.6
Health care providers can diagnose people with PKD1 sooner because their symptoms appear sooner. People with PKD1 also usually progress more quickly to kidney failure than people with PKD2. How quickly ADPKD progresses also differs from person to person.
What are the most common complications of ADPKD?
Most people with ADPKD have pain, high blood pressure, and kidney failure at some point in their lives.
Pain is a common complication of ADPKD and is usually due to kidney or liver cysts. Pain also can be caused by
- kidney cyst infection
- bleeding or burst kidney cysts
- urinary tract infection
- kidney stones
- tissue stretching around the kidney due to cyst growth
High blood pressure
Almost all people with ADPKD who have kidney failure have high blood pressure. High blood pressure increases your chances of heart disease and stroke. High blood pressure can also damage your kidneys even more. Keep your blood pressure under control to help delay kidney damage.
Kidney failure means your kidneys no longer work well enough to stay healthy. Untreated kidney failure can lead to coma and death. More than half of people with ADPKD progress to kidney failure by age 70.7
What are other complications of ADPKD?
ADPKD complications, or problems, can affect many systems in your body besides your kidneys. Researchers have not found a link between PKD and kidney cancer.
You may see some ADPKD complications right away. Other complications may not appear for many years, depending on whether you have the PKD1 or PKD2 gene. Also, ADPKD complications can vary from person to person, so you may not have all of these problems.
Vascular system problems
Abnormal heart valves. Abnormal heart valves can occur in some people with ADPKD. Abnormal heart valves can cause too little blood to flow into the aorta, the large artery that carries blood from the heart to the rest of your body. Abnormal heart valves in people with ADPKD rarely need to be replaced. However, you may need more tests if your health care provider detects a heart murmur.
Brain aneurysms. An aneurysm is a bulge in the wall of a blood vessel. Aneurysms in the brain might cause headaches that are severe or feel different from other headaches. See a health care provider even before you take over-the-counter pain medicines for severe headaches or headaches that won’t go away.
Brain aneurysms can break open and cause bleeding inside the skull. Large brain aneurysms are life threatening and need immediate medical treatment. If you have an aneurysm, stop smoking and control your blood pressure and lipids.
Digestive system problems
Liver cysts. Liver cysts, which are fluid-filled cysts on the liver, are the most common nonkidney complication of ADPKD. Liver cysts don’t usually cause symptoms in people under age 30, because liver cysts are normally small and few in number in the early stages of ADPKD. In rare cases, liver cysts can eventually reduce liver function. In the most severe cases, you may need a liver transplant.
Because the hormone estrogen may affect liver cyst growth, women are more likely to have liver cysts than men. The more pregnancies a woman with ADPKD has had, the more likely she will have liver cysts.7
Diverticula. Diverticula are small pouches, or sacs, that push through weak spots in your colon wall. Diverticula can cause diverticulosis. Diverticulosis can cause changes in your bowel movement patterns or pain in your abdomen.
Urinary tract problems
Urinary tract infections (UTIs). Kidney cysts can block urine flow through the kidneys so that urine stays in your urinary tract too long. When urine stays in your urinary tract too long, bacteria in your urine can cause a bladder infection or a kidney infection. A kidney infection can cause further damage to your kidneys by causing cysts to become infected.
Kidney stones. People with ADPKD sometimes have kidney stones. Kidney stones can block urine flow and cause infection and pain.
Although most women with PKD have normal pregnancies, women with PKD who have high blood pressure and decreased kidney function are more likely to have preeclampsia, or high blood pressure during pregnancy.
With preeclampsia, the fetus gets less oxygen and fewer nutrients. Women with preeclampsia should be followed closely by their health care provider during and after pregnancy. After delivery, preeclampsia goes away.
Many men with ADPKD have cysts on their seminal vesicles, which are glands in the male reproductive system that help produce semen. Seminal vesicle cysts rarely cause infertility.
People with PKD who are considering having children may want to discuss family planning concerns with a genetics counselor.
What are the signs and symptoms of ADPKD?
In many cases, ADPKD doesn’t cause signs or symptoms until cysts are a half inch or larger in size. For this reason, you should meet with a health care provider if you are at risk for PKD before your symptoms start.
The most common symptoms are pain in the back and sides, between the ribs and hips, and headaches. The pain can be short term or ongoing, mild or severe.
Hematuria, or blood in the urine, may be a sign of ADPKD. If you have hematuria, see a health care provider right away.
How do health care providers diagnose ADPKD?
Health care providers diagnose ADPKD using imaging tests and genetic testing. A health care provider can make a diagnosis based on these tests and your age, family history of PKD, and how many cysts you have.
The sooner a health care provider can diagnose ADPKD, the better your chances of delaying complications.
A specially trained technician performs imaging tests in a health care provider’s office, an outpatient center, or a hospital. A radiologist reads the images. Adults usually don’t need anesthesia for these tests. However, a health care provider may give infants or children a sedative to help them fall asleep during the test.
Ultrasound. Ultrasound uses a device called a transducer that bounces safe, painless sound waves off your organs to create an image of their structure. An abdominal ultrasound can create images of your entire urinary tract or focus specifically on the kidneys. The images can show cysts in the kidneys.
Computed tomography (CT) scans. CT scans use a combination of x-rays and computer technology to create images of your urinary tract. For a CT scan of your urinary tract, a health care provider may give you an injection of contrast medium. Contrast medium is a dye or other substance that makes structures inside your body easier to see during imaging tests. You lie on a table that slides into a tunnel-shaped device that takes the x-rays. CT scans can show more detailed images of kidney cysts than ultrasound.
Magnetic resonance imaging (MRI). MRI machines use radio waves and magnets to produce detailed pictures of your body’s internal organs and soft tissues without using x-rays. An MRI may include an injection of contrast medium. With most MRI machines, you lie on a table that slides into a tunnel-shaped machine that may be open on each end or closed at one end. Some newer machines allow you to lie in a more open space. Health care providers use MRIs to measure kidney and cyst size and monitor kidney and cyst growth. Measuring kidney and cyst size and growth can help track the progress of PKD.
Your health care provider may refer you to a geneticist if you are at risk for ADPKD. A geneticist is an expert in genes and diseases that are passed down through families. You will provide the geneticist with a blood or saliva sample, which will be tested in a special lab for the gene mutations that cause ADPKD. The genetic testing may take many days or weeks to complete.
A health care provider may also use genetic testing results to find out whether someone with a family history of PKD is likely to develop PKD in the future.
When to consider genetic counseling
If you are considering genetic testing, you and your family may want to talk with a genetics counselor as part of your health care team. Genetic counseling may be useful when you’re deciding whether to have genetic testing and again later when test results are available. Genetic counseling can help you and your family understand how test results may affect your lives.
How does my health care team treat the most common complications of ADPKD?
Although a cure doesn’t exist yet for ADPKD, treatment can help reduce your complications, which can help you live longer.
A health care provider needs to find the source of your pain before he or she can treat it. For example, if growing cysts are causing pain, the health care provider may first suggest over-the-counter (OTC) pain medicines such as aspirin or acetaminophen.
Always talk with a health care provider before taking any OTC medicines because some may be harmful to your kidneys. People with ADPKD have a higher risk for acute kidney injury (AKI), which is the sudden and temporary loss of kidney function. Sometimes AKI is caused by using OTC painkillers for a long time.
Depending on the size and number of cysts and whether medicine helps your pain, a health care provider may suggest surgery. Surgery to shrink cysts can help pain in your back and sides for a while. However, surgery does not slow PKD’s progress toward kidney failure.
Control your blood pressure
Controlling your blood pressure can slow the effects of ADPKD. Lifestyle changes and medicines can lower high blood pressure. Sometimes you can control blood pressure with healthy eating and regular physical activity alone.
Treat kidney failure
ADPKD can eventually cause your kidneys to fail. People with kidney failure must have dialysis or a kidney transplant to replace their kidney function.
The two forms of dialysis are hemodialysis and peritoneal dialysis. Hemodialysis uses a machine to circulate your blood through a filter outside the body. Peritoneal dialysis uses the lining of your abdomen to filter the blood inside the body.
How does ADPKD affect my day-to-day life?
Managing PKD successfully will probably include several lifestyle changes, such as changes in your physical activity level and what you eat. Visiting with a health care team on a regular basis is an important part of your routine as you work to limit your kidney problems.
PKD is a costly disease to manage and treat, especially if health insurance doesn’t cover some or any of your costs. Financial help may be available from the Federal Government and other sources. Visit the Centers for Medicare & Medicaid Services website or talk with your health care team for more information.
Many people with PKD may find it hard, but not impossible, to get life insurance. Contact an insurance company that specializes in “impaired risk life insurance.”
This content is provided as a service of the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), part of the National Institutes of Health. The NIDDK translates and disseminates research findings through its clearinghouses and education programs to increase knowledge and understanding about health and disease among patients, health professionals, and the public. Content produced by the NIDDK is carefully reviewed by NIDDK scientists and other experts.