The most useful thing to know about infiltration during dialysis is what changes at the access when it happens. Swelling, tightness, burning, or new pain around a fistula or graft needle site are reasons to get the dialysis staff’s attention immediately so they can assess the needle and access.
Quick answer
Infiltration is a cannulation-related injury that happens when a fistula or graft needle is not fully inside the access or moves through or out of the vessel wall, allowing blood to leak into the surrounding tissue. You may notice sudden swelling, pain, burning, pressure, warmth, or a change around the needle site. Tell dialysis staff immediately so they can assess the needle, the access, and the treatment circuit.
What infiltration actually is
During dialysis with a fistula or graft, two needles are placed to move blood to the machine and back. For that to work safely, the needle tip needs to stay properly positioned inside the vessel for the whole treatment. Infiltration is what happens when it doesn’t — the needle tip ends up partly or fully outside the vessel wall, so blood being pumped through that line leaks into the tissue around it rather than completing its normal path.
Infiltration is a recognized complication of fistula or graft cannulation. Risk can be higher with a new or fragile access, needle malposition, incomplete needle placement, or movement that changes needle position.
What it might feel like
- Sudden swelling at or near the needle site, sometimes rapid
- Tightness, burning, or stinging that feels different from the initial needle placement
- Pain or discomfort that wasn’t there a moment ago
- The skin may look puffier or feel firmer than the surrounding area
Infiltration can occur during needle insertion, while dialysis is running, or around needle removal. During treatment, sudden pain, swelling, pressure, warmth, or an unexpected machine pressure alarm can be a reason for staff to check the access promptly.
DO
Tell staff right away — don’t wait for the next check.
If you notice sudden swelling, tightness, or new pain at your access during treatment, say something immediately rather than waiting to mention it later. Try to keep your access arm still until staff can look at it.
What staff typically do
Staff assess the needle site, the amount of swelling or bleeding, the access itself, and whether dialysis can safely continue. Depending on what they find, they may stop the blood pump, remove or leave the affected needle in place temporarily, apply pressure or ice, use another cannulation site, use a catheter if one is available, or change the treatment plan. The appropriate response depends on factors such as the severity of the infiltration and whether anticoagulation has already been given, so the dialysis team should make those decisions.
Why it’s more likely with a newer access
New or fragile accesses can be more difficult to cannulate and may have a higher risk of infiltration. If infiltration happens repeatedly, ask your dialysis team whether the access, needle placement, or cannulation plan needs to be reassessed.
Frequently Asked Questions
Is infiltration dangerous?
The severity can vary. KDOQI distinguishes minor infiltration injuries from major or severe injuries based on the amount of bleeding and swelling, recovery time, and whether additional medical treatment is needed. Any sudden swelling, pain, bleeding, or other change at the access should be reported immediately so the dialysis team can assess it.
Does infiltration mean my fistula or graft is failing?
Not on its own. A single infiltration event is a needle-placement issue for that treatment, not necessarily a sign of a bigger access problem. If it happens repeatedly, that pattern is worth discussing with your care team.
Will I need a new needle stick if this happens?
Possibly — staff will decide whether to reposition, use a different site, or adjust the plan for that treatment based on what they see. This is routine for them, even if it’s new and unsettling for you the first time.
Can this happen with a catheter?
Infiltration as described here is specific to needle-based access (fistulas and grafts), since catheters connect directly without needles each treatment. Catheters have their own separate set of things to watch for. → Can You Shower With a Dialysis Catheter?
When a dialysis needle shifts out of position
A needle can shift so blood or fluid moves into tissue around the access.
Swelling, discomfort, firmness, bruising, or pressure changes may draw attention to the access.
The team checks the needle site and access and decides what is needed before continuing.
What your dialysis team can see and assess
Swelling, leaking, bruising, tenderness, and needle position.
The feel of the access and whether blood-flow or pressure readings changed.
Pain, burning, tightness, or anything else you noticed around the site.
A useful question: What did you notice about the needle or access, and what should I watch for afterward?
What Happened, in Order?
If an infiltration happens, it may be useful to remember the sequence: what you felt first, whether swelling or bruising appeared, when you told staff, and what they did next. For safety, leave needle repositioning or adjustment to the dialysis staff.
Ask It This Way
“Can you tell me what you noticed and what I should watch for after I leave?”
Related Renal Care Planner Resources
- Fistula vs. Graft vs. Catheter: Understanding Hemodialysis Access
- How to Protect Your Fistula or Graft: Everyday Do’s and Don’ts
- Hand Hygiene and Dialysis: Why It’s Emphasized So Much
Sources
- Minnesota Department of Health: Hemodialysis Fistula or Graft Tip Sheet
- National Kidney Foundation: KDOQI Clinical Practice Guideline for Vascular Access — infiltration injury definitions and vascular access guidance
- BC Renal: Hemodialysis Complications Guideline — infiltrated needle during dialysis
General education only. Renal Care Planner provides general educational information and planning resources. Always tell dialysis staff immediately about any sudden swelling, pain, or change at your vascular access during treatment rather than assessing it yourself.