Haemodialysis Access Grafts
Dialysis and your arterial access graft
The failure of any organ in the body has both physical and emotional consequences. Kidney failure is no exception. However, there are effective ways to cope with the loss of function of your kidneys.
Knowledge concerning the care you receive from your kidney specialist and the dialysis staff can help you to take control of your situation. Controlling your medical condition, however, means that you will have to adopt some new behaviours and lifestyles. Your kidneys did a big job, but now you must consciously make choices to compensate for the role they played in maintaining your health.
The two basic functions of the kidneys are to cleanse the body of waste products and to regulate the amount of water and certain chemicals in the blood. Dialysis helps do both, but watching what you eat and drink and following your doctor’s advice about taking medicines are very important.
What are my treatment options?
Unfortunately, kidney failure is generally irreversible. One option is to have a kidney transplant, but even recipients of a kidney transplant usually must temporarily undergo some form of dialysis. Dialysis is currently practiced in two forms: haemodialysis and peritoneal dialysis.
Are there different kinds of dialysis access surgeries?
Haemodialysis requires access to the blood flowing inside the blood vessels so it can be withdrawn and cleansed. Repeated needle puncture is very hard on veins and arteries, however. Special surgical techniques must be used to create an area that can be used for repeated blood access.
One method is the creation of an arteriovenous fistula. In this technique an artery and a vein are sewn together. Arteries carry blood at high pressure away from the heart into every part of the body. Veins collect blood and carry it at low pressure back to the heart. Attaching the artery to the vein causes the vein to balloon out as high-pressure blood flows directly into it from the artery. About six weeks after operation, the vein grows tougher and thicker. This fact, plus the increased size, make the vein ideal to use for hemodialysis access.
There are times when a person’s blood vessels are too small and fragile to create an arteriovenous fistula. In such cases a short piece of special tubing, called a vascular graft, can be used to connect the artery with the vein. Blood flowing through this arteriovenous (AV) graft can be removed by puncturing the graft with the dialysis needles.
How is the Operation done
Follow your doctor’s orders to prepare for this surgery. Those who are right-handed will often have the left arm chosen for surgery — the right arm for those who are left-handed. If a blood test is ordered before surgery, always ask to have the blood drawn from the arm that will not be operated on.
In the operating room your arm will be swabbed with antiseptic solution and numbed with a small shot so you will feel no discomfort. You may receive additional medicine to relax you and make you feel drowsy. Antibiotics are given to lessen the chance of infection. In most cases, the entire operation will take about 90 minutes.
What are the risks of having a graft placed for dialysis?
There is a risk of infection with any operation. If infection occurs, it can sometimes be treated successfully with antibiotics. However, the graft may have to be removed and another inserted in a different location. If this happens you may also need to have a temporary catheter placed in the area of the neck or groin.
If too much blood flows through the graft and not enough flows to the hand; pain, coldness and numbness may result. This may require re-operation to restrict blood flow through the graft so that more blood flows to the hand.
What will recovery from the surgery be like?
You will experience some bruising, swelling and discomfort in your arm. This is normal and pain medication may be prescribed. Your doctor will give you specific advice, but in general these steps should be followed after you are released from the hospital:
- Keep the arm extended and elevated above the level of the heart; place it on a pillow while lying down and hold it up while sitting.
- Keep the incision area clean and dry; change and replace wet or soiled dressings.
- Avoid putting any pressure on the arm or swinging it around.
- Rest, follow your diet, and take your prescription medicines.
- Your doctor may advise you to perform specific exercises, such as squeezing a
- rubber ball.
When can the graft be used?
After the swelling has gone down, you will be able to see the faint outline of the graft in your arm. By placing your fingertips over the graft you will be able to feel a vibration (thrill) that indicates blood is flowing. When you return for your check-up, ask to use your doctor’s stethoscope to listen for the swishing noise (bruit) the blood makes as it flows through the graft. These two signs indicate the AV graft is functioning as intended.
What should I expect during a haemodialysis session?
The first step is to make sure the area where the needle will enter the skin is disinfected. The dialysis technician should wash the site with soap and water, then rub a special antiseptic solution in a circular motion over the area selected. Once this has been done, do not touch the area until after dialysis is complete. Remember that the needle breaks the skin, opening a door for infectious bacteria to enter. Absolute cleanliness is required to reduce your chances of infection.
The technician will then insert the needles through the skin and into the graft or fistula. The needles are taped in place and connected to the lines of the dialysis machine and the dialysis process begins.
When your blood has been sufficiently cleansed of waste products, the technician will remove the needles. To stop the bleeding, the technician may ask you to hold light pressure with a sterile pad. Use just enough pressure to stop the bleeding — too much force may slow the blood flow through the graft or vein and lead to problems.
When the graft is new there may be bleeding into the tissue surrounding the graft after the needle is removed. The chance of this occurring will diminish as your body heals around and into the graft. During your first visits to the dialysis center, the staff will watch closely for any signs of bleeding under the skin. After the initial phase of your treatment, your dialysis sessions should become more routine.
If you have an AV graft, it is a good idea to make a diagram at the end of every dialysis session showing where the needle entered the graft. You should allow that spot to heal before it is punctured again. On your next visit, remind the technician to insert the needle at least one-half inch away from the previous puncture. It is best to have future needle punctures proceed along the full length of the graft before returning to any previous site. This allows the body enough time to repair the graft puncture.
How long do grafts stay open?
On average, grafts stay open about a year. It is difficult to predict because some grafts become blocked after only a few months while others may stay open for years. You will know when the graft is blocked because the swishing noise and vibration (bruit and thrill) stop. Blockage usually occurs because scar tissue forms where the graft is connected to the vein. This slows the blood flow and produces a clot. When this happens, it is not dangerous, but it does require another trip to the operating room where the scar tissue and clot are removed and the graft is repaired.
What changes will haemodialysis have on my lifestyle?
Haemodialysis will change many things about your life. It is possible for people with kidney disease to have full, active lifestyles. This is not true of many chronic diseases.
Your treatment for kidney disease means you have entered into a healthcare partnership with many people — doctors, nurses, pharmacists and medical device professionals — to name a few. Each one has a stake in helping you to live your life to the fullest. But you have the most important responsibility of all — using existing knowledge and technology to obtain the best result for you. This booklet is only one element to assist you and is meant to stimulate you to ask questions and participate in your care.
To help you get the most out of your treatment, here are some tips on how to spot trouble early and to protect your graft or fistula:
- An infection is a very serious condition. Be sure to keep the area surrounding the graft or fistula clean and always disinfect the puncture site. If a needle puncture site has persistent swelling and redness or any drainage, call your doctor.
- Do not use a graft or fistula for anything but your dialysis treatments. Your graft or fistula should not be used for blood samples (except during a dialysis session) or intravenous drug treatments.
- Maintain your diet and exercise per your doctor’s instruction. You will feel better and the blood vessels that are your lifelines will be more likely to remain functional.
- A spreading bruise under the skin after the dialysis needle is removed probably means that the bleeding has not stopped. Seek the assistance of your doctor to halt the bleeding.
- A hard knot with black and blue discolouration in any one area of the graft may mean that repeated needle puncture has damaged part of the graft wall. This will need to be repaired. Never allow repeated puncture in the same spot on the graft.
- Do not compress the graft or fistula with tight clothing, bracelets or watches because blood flow might be stopped. Similarly, do not rest a heavy load against it, like a bag of groceries, or sleep on it. And do not have your blood pressure taken in the arm with the graft or fistula because the pressure cuff may stop blood flow.
- Never touch the area where the needle is to enter after skin disinfection or during dialysis.
- Never wear tight sleeves, watches, or bracelets over your graft or fistula.
- Never carry heavy loads against or on the graft or fistula (like purses or shopping bags), sleep on it or have blood pressure taken in the same arm.
- Never use your graft or fistula for routine blood tests (except during a dialysis session) or intravenous drug treatments.
- Always make sure your arm is washed and clean before each dialysis session.
- Always follow your doctor’s recommendations for maintaining your diet, taking your prescription medicines and exercising regularly.
- Always apply light pressure to stop bleeding after the dialysis needles are removed. Have the nurse / technician check to make sure bleeding has stopped before you leave the dialysis centre.
- Always vary needle puncture sites. Follow a “puncture plan” for advancing needle punctures along the length of the graft before going back to a previous site.
WARNING SIGNS THAT A DOCTOR’S CARE MAY BE NEEDED
- Swelling, redness, pus drainage or fever may indicate infection.
- A spreading bruise after completion of a dialysis session may indicate graft bleeding under the skin.
- A pulsating hard knot felt under the skin may indicate graft damage because of repeated needle puncturing in the same place.
- Coldness, numbness, aching or weakness of the hand may indicate that not enough blood is getting to the hand (this is not a common problem).
- No vibration (bruit or thrill) from the graft or fistula may mean blood has stopped flowing through it.
Glossary of Terms
Arteriovenous (AV) Fistula
Direct connection between an artery and a vein. The dilated vein is punctured during haemodialysis.
Arteriovenous (AV) Graft
Synthetic material connecting an artery and a vein. The graft is punctured during haemodialysis.
Vessel carrying blood from the heart to the rest of the body.
‘Swishing’ sound of blood flowing through an arteriovenous fistula or graft.
A tube inserted into a vein to remove blood from the body.
Blood that thickens and blocks blood flow.
Process of filtering blood to remove toxic materials and to maintain balance of important blood components in the case of impaired kidney function.
Removal of toxic substances from the body (dialysis) by removing the blood from the body via tubes directly from an Arteriovenous Fistula or Arteriovenous Graft.
Removal of toxic substances from the body (dialysis) via a catheter placed in the peritoneal cavity.
Vibration caused by the flowing of blood through an arteriovenous fistula or graft.
Vessel carrying blood from the body back to the heart.
Where can I get more information?
National Kidney Foundation – www.kidney.org
Vascular Access Society of America – www.vasamd.org
US National Library of Medicine – www.medlineplus.gov
Vascular Flow Technologies Ltd – www.vascular-flow.com