Chronic Venous Insufficiency (CVI) — Complete Patient Guide

If your doctor told you “you have CVI” — you probably left the appointment with more questions than answers. What exactly is CVI? Is it the same as varicose veins? Is it dangerous? What happens if you leave it untreated? This guide answers all of these in plain language.

What Is Chronic Venous Insufficiency (CVI)?

The veins in your leg need to return blood to the heart — against gravity. They do this with small one-way valves that prevent blood from falling back down. When these valves fail — due to genetics, pregnancy, ageing, or prolonged standing — blood pools in the leg veins. The resulting elevated venous pressure is called venous reflux, and CVI is the chronic condition that describes this state.

The CEAP Classification — Understanding the Stages

CEAP is the international scale for classifying venous disease severity. Here is what each stage means in patient language:

• C0 — No visible signs. Symptoms (leg heaviness) may exist without physical findings.
• C1 — Spider veins — small red-purple networks of capillaries. Often cosmetic, but may indicate deeper insufficiency.
• C2 — Varicose veins — visible, bulging, blue-green veins above 3mm. Referral to a vein specialist is advisable at this stage.
• C3 — Edema — ankle and calf swelling worse by end of day. Directly caused by venous hypertension. May qualify for partial kupat holim coverage for RFA.
• C4 — Skin changes — pigmentation, venous eczema, lipodermatosclerosis around the ankle. Evidence of chronic damage from sustained venous pressure.
• C5 — Healed venous ulcer — high recurrence risk without treating the underlying cause.
• C6 — Active venous ulcer — open wound, typically near the inner ankle. Requires urgent treatment.

Why CVI Progresses Over Time

CVI is not a stable condition. Sustained elevated venous pressure gradually damages vein walls, causes more valve failures, and raises pressure further. Each stage sets the conditions for the next. The rule: the earlier you treat, the simpler, cheaper, and less complex the treatment.

Who Is at Risk for CVI?

• Family history — the strongest risk factor. Two affected parents = >90% risk
• Female sex — hormonal factors, pregnancy, oral contraceptives
• Prolonged standing — retail workers, healthcare staff, teachers
• Increasing age — vein walls weaken over time
• Prior DVT — deep vein thrombosis that damaged valves
• Obesity — increases mechanical pressure on the venous system

How Is CVI Diagnosed?

Dr. Shimon Aronhime, interventional radiologist and endovascular surgeon, performs a duplex ultrasound at every initial consultation. Duplex ultrasound is the diagnostic gold standard for CVI — it maps the entire venous system, measures the direction and velocity of blood flow, and identifies exactly which valves have failed and in which veins.

Treatment Options for CVI

• C1–C2: Sclerotherapy for spider veins, RFA or VenaSeal for varicose veins
• C3–C4: RFA/VenaSeal to close the refluxing saphenous vein — reduces edema and prevents progression to skin damage
• C5–C6: Urgent treatment including closure of the refluxing vein and local wound management

Frequently Asked Questions

What is chronic venous insufficiency (CVI)?

Chronic venous insufficiency is a condition in which the venous valves in the leg veins fail to function properly, allowing blood to pool in the lower limbs rather than returning efficiently to the heart. Symptoms range from heaviness and swelling (CEAP C1-C2) to skin changes and venous ulcers (C4-C6).

How is CVI diagnosed?

The gold standard is Duplex Doppler ultrasound, which maps venous reflux, identifies which veins are incompetent, and quantifies the degree of insufficiency. At Israel Vein Center, Doppler is performed at the consultation visit — no separate appointment needed.

Can CVI be cured?

CVI cannot be cured in the traditional sense, but the diseased veins causing reflux can be permanently closed with RFA or VenaSeal. This stops progression and reverses many symptoms. Without treatment, CVI tends to worsen over time.

What is the difference between CVI and varicose veins?

Varicose veins (C2) are one manifestation of CVI. CVI is the underlying disease — valve failure — of which varicose veins, spider veins, leg swelling, and venous ulcers are all different stages.

Is CVI curable?

The diseased veins themselves can be permanently closed by RFA or VenaSeal. Because there is a genetic component, compression stockings and exercise help after treatment.

What does C4 mean?

Skin changes around the ankle — pigmentation, venous eczema, skin hardening. Requires prompt treatment to prevent venous ulceration.

How fast does CVI progress?

Studies show approximately 20–30% of patients with C2 disease will advance to a higher stage within 5 years without treatment. Early intervention stops this progression.

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References

1. Gloviczki P, et al. The 2022 Society for Vascular Surgery, American Venous Forum, and American Vein and Lymphatic Society clinical practice guidelines for the management of varicose veins. J Vasc Surg Venous Lymphat Disord, 2023–2024.
2. European Society for Vascular Surgery (ESVS) 2022 clinical practice guidelines on the management of chronic venous disease. Eur J Vasc Endovasc Surg, 2022.
3. Lurie F, et al. The 2020 update of the CEAP classification system and reporting standards. J Vasc Surg Venous Lymphat Disord, 2020.