A deep vein can remain narrowed or blocked after a blood clot or other injury. When blood cannot leave the leg normally, pressure can build and cause long-lasting swelling, heaviness, pain, skin changes, or a venous ulcer. Not every old clot needs a procedure. Treatment is considered when the symptoms, imaging, and expected benefit support reopening the vein.
What causes a chronic vein blockage?
The most common cause is scarring after a deep-vein thrombosis, or DVT. This can lead to post-thrombotic syndrome. Other causes include prior catheters, surgery, radiation, injury, or narrowing where veins pass through the chest, abdomen, or pelvis. Symptoms may include:
- Swelling that affects one leg more than the other
- Heaviness, aching, pressure, or cramping
- Symptoms that worsen with standing or walking
- Visible veins across the lower abdomen, pelvis, or leg
- Skin darkening, thickening, or a venous ulcer
- Arm, face, or neck swelling when an upper-body vein is involved
Blockage, reflux, and PAD are different
A chronic venous occlusion blocks blood returning to the heart. Venous reflux is backward flow through weak valves. PAD is reduced blood flow through an artery. These problems can overlap, but they require different tests and treatments.
How it is evaluated
Evaluation includes symptom history, examination, and review of prior clots and procedures. Duplex ultrasound is often the first test. CT or MR venography may show deeper veins. Catheter venography and intravascular ultrasound can define the blockage when treatment is being considered. The team also reviews blood-thinner use, kidney function, bleeding risk, heart and lung symptoms, and other possible causes of swelling.
When treatment may be considered
Conservative care can include activity, compression when safe, skin care, wound care, and medication directed by the patient’s clinicians. A procedure may be considered when significant symptoms continue and imaging shows a blockage that can reasonably be treated. An interventional radiologist may pass a wire through the blocked segment, open it with a balloon, and place a stent when needed to keep the vein supported. Chronic blockages vary widely; some cannot be crossed or may not remain open.
The outpatient procedure and recovery
Provectus performs selected chronic venous interventions as outpatient procedures, generally with local anesthesia and moderate sedation when clinically appropriate. Access is obtained through a vein, often in the leg, neck, or arm, depending on the location of the blockage. Patients go home after monitored recovery. Temporary soreness, bruising, or swelling may occur. Medication, activity, compression, and imaging follow-up are individualized. A venous stent requires ongoing surveillance.
Benefits, limits, and risks
Successful treatment may reduce venous pressure, swelling, pain, or ulcer-related symptoms. Relief may be incomplete when valve damage, lymphedema, or another condition also contributes. Possible complications include bleeding, infection, contrast reaction, kidney injury, vein injury, clotting, pulmonary embolism, stent movement, stent narrowing, or the need for another procedure. Blood-thinning medication after treatment is not identical for every patient.
When symptoms are urgent
Sudden new swelling or pain may mean an acute DVT. Chest pain, shortness of breath, coughing blood, or fainting may mean a pulmonary embolism; call 911.
Patient Q&A
Can a vein that has been blocked for years be reopened?
Sometimes. The answer depends on the location, length, scarring, nearby veins, and whether the expected benefit outweighs the risk.
Is chronic venous occlusion the same as May-Thurner syndrome?
No. May-Thurner is an iliac-vein compression pattern. A chronic occlusion may result from an old clot or other injury, although both conditions can involve the iliac veins.
Will a stent cure all leg swelling?
Not always. Swelling can have more than one cause, including valve damage or lymphedema.
Will I need a blood thinner after treatment?
The plan depends on prior clotting, bleeding risk, the treated vein, and the procedure. It must be individualized.
Can a treated vein block again?
Yes. Follow-up and medication adherence are important because restenosis or clotting can occur.