Windflower Vein & Vascular

Ultrasound Guided Foam Sclerotherapy for Varicose Veins

Q: What is ultrasound guided foam sclerotherapy?

Ultrasound guided foam sclerotherapy (UGFS) is a non-surgical treatment for varicose veins in which a medicated foam is injected into the diseased vein under real-time ultrasound visualization. The foam irritates the vein wall, causing it to close and eventually be reabsorbed by the body. It is performed in a clinic without general anesthetic.

Q: How is foam sclerotherapy different from regular sclerotherapy?

Standard sclerotherapy uses a liquid sclerosant and is typically used for small surface veins and spider veins visible through the skin. Foam sclerotherapy uses a foam formulation that is more effective in larger veins because it stays in contact with the vein wall without being diluted by blood. Ultrasound guidance allows treatment of veins too deep to see with the naked eye.

Q: Is ultrasound guided foam sclerotherapy painful?

Most patients find it well tolerated. The needle insertion may cause a brief sting, and some people feel a mild burning or cramping sensation as the foam is injected. There is no general anesthetic needed. After the procedure, the leg may feel tender or achy for a few days.

Q: How long does UGFS take?

The procedure itself typically takes 30 to 60 minutes. You can expect to be at the clinic for about 90 minutes in total when you factor in preparation and post-procedure observation.

Q: How long does recovery take after foam sclerotherapy?

Most patients walk out of the clinic and return to light activities the same day. Compression stockings should be worn as directed for two weeks. Strenuous exercise and prolonged heat exposure (hot baths, saunas) should be avoided for the first two weeks. There is no surgical recovery.

Q: How soon will I see results from UGFS?

You will not see immediate results. The treated vein closes over time and is gradually reabsorbed. Most patients notice meaningful improvement within four to eight weeks. Full results, including resolution of bruising and any skin staining, develop over several months.

Q: Can varicose veins come back after sclerotherapy?

The specific veins that are successfully closed will not reopen. However, venous insufficiency is a chronic condition, and new varicose veins can develop over time. Follow-up ultrasound assessments help monitor for this, and additional treatment can be performed if needed.

Ultrasound guided foam sclerotherapy (UGFS) is a minimally invasive treatment for varicose veins using injected foam to close diseased veins. No surgery, no hospital stay.

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Ultrasound guided foam sclerotherapy (UGFS)

Ultrasound guided foam sclerotherapy (UGFS) is a minimally invasive treatment for varicose veins. A chemical solution mixed into a foam is injected directly into the affected vein under ultrasound guidance. The foam displaces blood inside the vein, causes the vein wall to become inflamed and close, and the collapsed vein is gradually absorbed by the body over the following weeks. No surgical incisions are required.

The ultrasound component is what makes this technique effective for deeper or larger veins that cannot be seen or felt through the skin. The treating physician watches the foam move through the vein in real time on an ultrasound monitor, confirming accurate placement and complete treatment of the target vessel.

At Windflower Vein & Vascular, ultrasound guided foam sclerotherapy is offered as part of a comprehensive approach to venous disease, either as a standalone treatment or in combination with other procedures such as microphlebectomy or endovenous ablation.

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Conditions Ultrasound Guided Sclerotherapy Helps Treat

Foam sclerotherapy under ultrasound guidance is particularly well suited for:

Large varicose veins in the leg that are too deep or tortuous for simple surface injection
Incompetent great saphenous or small saphenous veins, where thermal ablation is not appropriate or preferred
Recurrent varicose veins after previous treatment or surgery
Perforator veins (vessels connecting the deep and superficial venous systems) that are contributing to venous disease
Varicose veins associated with venous ulceration or chronic venous insufficiency
Patients who are not suitable for surgical treatment due to health or anatomy

It is also used in cases where the varicose vein anatomy is complex, making catheter-based techniques difficult to perform.

How Ultrasound Guided Foam Sclerotherapy Works

The sclerosant foam

The sclerosant is a chemical agent (typically sodium tetradecyl sulfate or polidocanol) that has been mixed with a small amount of gas using a technique that produces a stable foam. Foam is more effective than liquid sclerosant for treating larger veins because it displaces blood rather than mixing with it, allowing the chemical to stay in contact with the vein wall long enough to cause closure.

The procedure

The skin is cleaned and a needle is guided into the target vein using real-time ultrasound imaging. Once the needle is confirmed to be correctly positioned, the foam is slowly injected. The treating physician watches the foam travel through the vein on the ultrasound monitor. Compression is applied to the leg immediately after injection to keep the vein walls together and encourage closure.

The procedure typically takes 30 to 60 minutes, depending on how many veins are being treated. It is performed in a clinic setting under no anesthetic or with a small amount of local anesthetic at the injection site. Most patients feel only a mild stinging or pressure sensation.

After treatment

A compression stocking is applied immediately following the procedure. Walking is encouraged right away to promote circulation. You will be asked to wear compression stockings and avoid prolonged sitting or standing for a period following treatment.

What to Expect After Treatment

The treated vein will not disappear immediately. Over the following weeks, the body absorbs the closed vein, and the visible bulge gradually subsides. Some inflammation, bruising, and firmness along the vein track is normal and expected as part of the healing response.

Most patients see a significant reduction in the treated veins within four to eight weeks. In some cases, particularly where veins are large or extensive, more than one treatment session may be needed for complete results. Your treating physician will assess your response at follow-up and advise whether additional sessions are recommended.

How Many Treatments Are Needed

This varies from patient to patient. Some people achieve their goals in a single session; others with more extensive venous disease may require two or three treatments spaced four to eight weeks apart. At your initial consultation, the extent of your venous disease will be mapped with duplex ultrasound, and a realistic estimate of the number of sessions required will be discussed.

Benefits of Ultrasound Guided Foam Sclerotherapy

No surgical incisions, stitches, or general anesthetic
Performed in a clinic setting with same-day discharge
Effective for large, deep, and recurrent varicose veins that other minimally invasive techniques may not reach
Can treat multiple veins in a single session
Lower recovery burden compared to surgical options
The procedure can be repeated if needed without increased risk

Risks and Considerations

Ultrasound guided foam sclerotherapy is safe and widely used, but patients should be aware of the following:

Bruising and tenderness along the treated vein are common and resolve over one to four weeks.
Skin staining (hyperpigmentation): A brownish discolouration can develop along the treated vein track, caused by iron deposits from trapped blood. This fades in most patients over several months but can occasionally be longer lasting.
Trapped blood (thrombophlebitis): Firm, tender lumps may develop as the treated vein closes. These are expected and resolve on their own; in some cases, draining the trapped blood at a follow-up visit speeds resolution.
Visual disturbances: Mild, temporary visual symptoms (flashing lights, blurring) can occur shortly after injection. They resolve within minutes and are more commonly associated with large foam volumes. Tell your physician immediately if you experience this.
Deep vein thrombosis (DVT): Rare. The foam can extend into the deep venous system in some cases. Post-procedure compression and walking help reduce this risk. Patients with a history of DVT or clotting disorders require specific assessment before treatment.
Nerve irritation or skin damage: Uncommon, and typically associated with injection near superficial nerves or inadvertent injection outside the vein.
Incomplete closure or recurrence: Some veins may not close fully and require retreatment.

Your physician will review your health history, including any history of clotting disorders, prior DVT, or known right-to-left cardiac shunt (such as a patent foramen ovale), before recommending UGFS.

Frequently Asked Questions

What is ultrasound guided foam sclerotherapy?

How is foam sclerotherapy different from regular sclerotherapy?

Is ultrasound guided foam sclerotherapy painful?

How long does UGFS take?

How long does recovery take after foam sclerotherapy?

How soon will I see results from UGFS?

Can varicose veins come back after sclerotherapy?

Am I a good candidate for UGFS?

UGFS is suitable for a broad range of patients with varicose veins, including those with recurrent veins after previous treatment. It may not be appropriate for patients with certain clotting disorders, active leg infections, significantly impaired arterial circulation, or a known right-to-left cardiac shunt. A duplex ultrasound assessment and consultation are the first steps in determining whether it is right for you.

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An ultrasound scan is the starting point for any varicose vein treatment at Windflower Vein & Vascular.

It maps the venous anatomy, identifies the source of reflux, and informs which treatment approach is most appropriate for your situation. Contact us to schedule a consultation and find out whether ultrasound guided foam sclerotherapy is the right option for you.

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