In addition to feeling (palpating) and listening to (auscultating) the access every day, a vascular ultrasound examination every 3 to 6 months is also recommended. Sometimes the access feels and sounds normal, but a more detailed ultrasound can find stenosis or clots that cannot be detected by eye or touch. Treating problems early helps extend the life of the access.
.
Why does a vascular access need regular follow-up?
Access problems are among the common complications in hemodialysis patients. A dialysis machine needs a blood flow of at least 200 mL per minute to deliver adequate dialysis. Once the access narrows, blood flow falls, which not only reduces dialysis adequacy but can also gradually lead to blockage. The main purpose of regular follow-up is therefore to find problems early and prevent the access from deteriorating to the point of blockage.
Two things to do every day: palpation and auscultation
Before the ultrasound visit, daily self-checks are just as important. We recommend doing these every day:
- Palpation: gently touch the access; normally you should feel a regular “thrill” (a buzzing, vibrating sensation)
- Auscultation: place a stethoscope close to the access and listen; normally you hear a “whoosh, whoosh” sound like wind blowing
If any of the following occurs, the access may have a problem. Contact the dialysis unit or return to the clinic as soon as possible and do not delay:
- The thrill cannot be felt, or feels weaker than usual
- The usual whooshing sound can no longer be heard, or the sound has become high-pitched and sharp
- The arm is clearly swollen or painful
- Needling has become difficult, or bleeding takes longer to stop after the needle is removed
- The machine frequently gives alarm signals during dialysis
.
Why is an ultrasound still needed if it feels and sounds normal?
Palpation and auscultation can pick up more obvious abnormalities, but cannot tell precisely “how severe the narrowing is.” Vascular ultrasound can measure the actual blood flow, confirm whether there is a clot, and show the exact location and severity of the stenosis, making it a finer tool than self-checks. This is why, even when daily palpation and auscultation feel normal, scheduling regular ultrasound examinations as your physician directs is still recommended, so that early problems that cannot yet be felt are not missed.
How often should an ultrasound be done?
An ultrasound is generally recommended every 3 to 6 months at follow-up. The actual frequency differs with the condition of each person’s access; for example, patients with a newer access or a history of stenosis or blockage may be advised to be checked more often. How often is right for you must still be decided by your attending physician according to your individual situation.
| Item | Self palpation / auscultation | Vascular ultrasound |
|---|---|---|
| Frequency | Recommended every day | Generally every 3–6 months, adjusted as your physician directs |
| What it can detect | More obvious flow abnormalities and changes in the bruit | Actual blood flow, location and severity of stenosis, presence of clots |
| Precision | A preliminary judgment that varies with personal perception | Quantified imaging data; finer and more objective |
| Performed by | The patient | The medical team |
If the ultrasound finds an abnormality, is surgery needed right away?
Not necessarily. Whether further treatment (such as balloon angioplasty) is needed is decided by the physician after considering the ultrasound results and clinical symptoms. A mild narrowing found at a check does not mean that surgery is needed immediately. The real point of regular follow-up is “not missing the right time to treat”: if you find the warning signs above during a self-check, return to the clinic or contact the dialysis unit promptly, rather than waiting until the access is completely blocked, which often requires a more complex intervention.
.
Non-invasive leg arterial and venous assessment service
In addition to access ultrasound follow-up, the Hemodialysis Access Professional Care Team also offers a 30-minute non-invasive leg vascular assessment for patients who would like to know more about their vessels. For the actual tests included and who they are suitable for, please discuss and confirm with the care team.
Frequently asked questions
Q: Does an access ultrasound hurt?
A: It is a non-invasive examination that leaves no wound, and most people feel no noticeable discomfort during it, although the actual experience varies from person to person.
Q: If palpation and auscultation are normal, is an ultrasound still needed?
A: Yes, it is recommended. Palpation and auscultation can pick up more obvious abnormalities, but the exact blood flow and degree of narrowing can only be quantified by ultrasound, and regular follow-up helps find problems that are hard to notice at an early stage.
Q: How often should an ultrasound be scheduled?
A: Generally every 3 to 6 months, but the actual frequency depends on your access and medical history. Please confirm with your attending physician the follow-up schedule that suits you.
Q: Is any special preparation needed before the examination?
A: Generally none. It can be arranged around your clinic visit or dialysis schedule, and if you have questions you can check with the care team in advance.
.
Regular follow-up is the key to a long-lasting access
The vascular access is a dialysis patient’s lifeline. Daily self-palpation and auscultation plus regular ultrasound follow-up are the most practical ways of extending its life. If you have any concerns about your own access, you are welcome to contact the STW Dr. Ta-Wei Su Hemodialysis Access Professional Care Team so that we can look after your access health together.
