Some dialysis patients may develop “central vein stenosis/occlusion” (CVS/O) during treatment. This can reduce the effectiveness of hemodialysis and cause discomfort such as swelling of the arm or face, and in severe cases it may even block the dialysis access (dialysis vessel).
Right arm swollen: right central vein occlusion
Left arm normal
What is central vein occlusion?
Central vein occlusion mainly occurs in the superior vena cava or the brachiocephalic veins (the vessels between the shoulder and the chest). Common causes include repeated use of temporary dialysis catheters and damage to the inner vessel wall from poor flow, which leads to narrowing or blockage. According to statistics, about 4% to 6% of dialysis patients encounter this problem.
Treatment options and the role of stents
Treatment includes minimally invasive percutaneous balloon angioplasty (PTA), stent placement (bare-metal or covered stents) and conventional surgical bypass. The aim is to “widen” the narrowed or blocked vessel to restore smooth venous return.
Clinical research
The Journal of Vascular Surgery (JVS), a leading US vascular surgery journal, published an article in March 2025 on 21 dialysis patients followed for an average of 41 months. After stent placement, symptoms such as swelling of the arm or face improved markedly and dialysis could proceed smoothly.
Summary of the findings:
- Primary patency: 67% at 1 year, 42% at 2 years, 38% at 3 years.
- Secondary patency: 90% at 1 year, 79% at 2 years, 60% at 3 years.
- 62% of patients developed stent restenosis during follow-up and needed repeat balloon angioplasty.
- 24% of patients developed access thrombosis requiring further treatment.
- 14% of patients ultimately needed additional conventional surgical bypass.
- 24% of patients died during follow-up from other causes.
Vessel patency after stent placement
| Time | Primary patency | Secondary patency |
|---|---|---|
| 1 year | 67% | 90% |
| 2 years | 42% | 79% |
| 3 years | 38% | 60% |
Primary patency
Definition: after central vein stent placement, the vessel stays open for a given period (for example six months or one year) without needing any additional intervention, because the stent alone keeps the vessel well open.
What it means: 1. A measure of procedural success: the higher the primary patency, the better and longer-lasting the stent procedure, with no need for further interventional treatment. 2. A predictor of the patient’s course: with a high primary patency, the patient may need fewer repeated treatments for vessel problems.
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Secondary patency
Definition: after stent placement, if the vessel develops mild narrowing or blockage over a period of time, it can still be kept open and usable through a simple intervention (such as balloon angioplasty or placing another stent). This is called “secondary patency”.
What it means: secondary patency more realistically reflects the success rate at which the access keeps working over a period of time when a stent is combined with simple interventions (such as balloon angioplasty or another stent). Physicians refer to this figure to judge how durable the treatment is and how likely the patient is to need further access maintenance in the future.
Summary: a central vein stent is an important but carefully assessed treatment option for dialysis patients. It can relieve symptoms and extend the life of the access, but regular follow-up and preparation for repeat treatment are still needed. (Possible complications of central vein stents include stent migration, stent fracture with blockage, infection and others.)
SG/RiCa
