Varicose Vein Sclerotherapy
Principles of varicose vein sclerotherapy; techniques, injection protocols, and results management
Sclerotherapy is the gold standard and the least invasive treatment approach for the removal of spider veins (telangiectasias) and prominent reticular veins in the lower extremities. Achieving maximum cosmetic efficacy with tissue safety requires understanding the dynamic structure of the vessels, selecting the precise concentration of drugs, and applying the appropriate pressure to reconstruct the vein wall.
1. Pathophysiology and Vascular Basis of Sclerotherapy
The ultimate goal of sclerotherapy is to reproduce controlled fibrosis in the lumen of dysfunctional vessels without causing secondary damage to the surrounding skin beds. In a healthy physiological state, the pigeon-nest valves prevent blood from returning downward; however, due to valvular insufficiency, hydrostatic reflux causes dilation of the terminal capillaries and the appearance of purple or blue branched veins.
Sclerosing drugs directly damage the endothelial lining of blood vessels. This process occurs in three distinct biological stages:
- Cellular denaturation: destruction of the intercellular junction of the endothelium and separation of the inner layer from the media.
- Sterile thrombosis: Obstruction of the inner lumen of a vessel without severe purulent or systemic inflammatory reactions.
- Persistent fibrosis and tissue resorption: Transformation of the damaged vessel into a rope-like fibrous strand that is eventually absorbed and eliminated by macrophages over weeks.
2. Careful pre-treatment assessment and the role of ultrasound
Observation of superficial veins is only the tip of the iceberg. Every candidate for sclerotherapy treatment requires a structured evaluation to determine whether the vein involvement is merely cosmetic or is rooted in deeper chronic venous insufficiency.
Initial clinical examinations
Skin assessment, presence of hemosiderin pigmentation, swelling around the ankle, history of deep vein thrombosis (DVT), and drug sensitivity.
Duplex ultrasound
Examination of the saphenofemoral and saphenopopliteal junctions to detect reflux times greater than 0.5 seconds and prevent recurrence of the lesion.
Transillumination and polarized light
Facilitates identification of deeper subcutaneous feeder veins for more precise injection guidance.
3. Classification of sclerosing agents and precise dosing
The choice of sclerosant should be strictly tailored to the caliber of the vein, the depth of placement, and the sensitivity of the treatment area. The most common drugs in reputable clinics are as follows:
| Drug name | Mechanism of action | Suggested concentration | Optimal use case |
|---|---|---|---|
| Polidocanol | Detergent (biological detergent) with local anesthetic effect | 0.25% to 1% | Telangiectasias and fine reticular veins |
| Sodium tetradecyl sulfate (STS) | Strong detergent with a more intense inflammatory response | 0.1% to 0.5% | Reticular vessels with medium diameter and thick feeders |
| Hypertonic Saline | Osmotic (osmotic dehydration of the endothelium) | 11.8% to 20% | Patients prone to allergies (with burning during injection) |
Using doses that exceed the standard not only does not create a more desirable result, but also greatly increases the risk of skin damage and scarring due to extravasation (the drug leaking out of the vein).
4. Comparison of Liquid and Foam Techniques
The introduction of the Tessari Method foam technique brought about a fundamental change in the aesthetic and therapeutic efficacy of sclerotherapy. The fundamental differences between these two formulations determine their use:
Liquid Sclerotherapy
It is rapidly diluted by the bloodstream. It is ideal for very thin capillary veins (under 1 mm) that require minimal disruption and have no chance of gas microembolism.
Foam Sclerotherapy
Mixing a 1:4 or 1:5 ratio of drug to gas/air. The foam displaces the blood column without dilution and provides prolonged contact with the vessel wall at a lower concentration.
5. Step-by-step injection protocol in the clinic
A consistent clinical approach will prevent unwanted cosmetic complications. The injection is usually performed in the supine or gentle Trendelenburg position:
- Using very fine needle tips: Using 30 or 32 gauge needles with a special cut and steep slope.
- Controlled entry angle: Penetration of the needle at a gentle angle of approximately 10 to 20 degrees parallel to the skin bed to avoid passing through the posterior wall of the vein.
- Confirm intravascular placement: Ensure that the needle tip is fully positioned within the lumen before applying any pressure to the syringe plunger.
- Slow injection with minimal pressure: Inject with a small volume (about 0.1 to 0.2 cc at each injection point) until the vein is blanched and the flow of the solution stops.
- Anatomical prioritization: Treatment always begins with the larger reticular feeder vessels and then progresses to the fine capillary telangiectasia branches.
6. Compression and Postoperative Care
Post-injection care is half of the clinical process and plays a crucial role in preventing unwanted mass thromboses and pigmentation.
- Daily walking: Encourage the patient to walk continuously for 15 to 20 minutes immediately after leaving the clinic to activate the leg muscle pump.
- Avoid high temperatures: Absolutely avoid saunas, jacuzzis, hot baths, and exposure to direct sunlight for at least 2 to 3 weeks.
- Avoid high-impact exercise: Avoid weight lifting or high-impact running during the first 72 hours of treatment.
7. Preventive management of complications and prognosis
Although sclerotherapy is considered the safest treatment for telangiectasia, being fully aware of the undesirable symptoms and managing them promptly guarantees lasting beauty:
Telangiectatic matting (Matting)
Formation of a new network of very small red capillaries in response to high inflammation or untreated deep reflux; usually resolves spontaneously within a few months.
Hemosiderin hyperpigmentation
Brown spots caused by iron deposition from destroyed red blood cells; risk reduction with timely aspiration of microthrombi at checkups two weeks later.
Localized skin necrosis
A rare complication resulting from leakage of concentrated drug into extravascular tissue or spasm of adjacent arterioles; requires immediate discontinuation and local supportive measures.
Sclerotherapy is a precise clinical art. Maintaining the right balance between vein diameter, sclerosant concentration, and uniform external pressure management restores the patient's skin's clarity and uniformity in the shortest possible time and without the need for long periods of rest.
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