What is Chronic Venous Insufficiency?
Chronic venous insufficiency is a progressive condition in which the one-way valves within the deep, superficial, or perforating veins of the legs become damaged or incompetent, allowing blood to reflux downward rather than traveling efficiently toward the heart. This retrograde flow raises the pressure within the venous system of the lower extremities — a state known as venous hypertension — which over time causes a cascade of structural and inflammatory changes in the vein walls, surrounding soft tissue, and skin.
CVI exists on a spectrum of severity, from mild symptoms such as aching and heaviness to advanced disease manifesting as chronic leg ulcers that can persist for months or years without appropriate treatment. The condition is closely related to varicose veins, which represent the visibly dilated, tortuous superficial veins that develop as a consequence of elevated venous pressure, though CVI can also exist without prominent varicose veins when the primary insufficiency is confined to the deep venous system.
The fundamental driver of CVI is venous valvular incompetence. Under normal conditions, venous valves open to allow upward flow toward the heart and close to prevent backflow when the calf muscle pump relaxes. When these valves are damaged — by prior deep vein thrombosis, inflammation, or structural degeneration — blood falls back into the dependent veins during relaxation, progressively elevating venous pressure and triggering the tissue changes that characterize advanced CVI. At Vascular Surgical Associates, we provide the diagnostic expertise and comprehensive treatment options necessary to address venous insufficiency at every stage of the disease.
Signs & Symptoms
CVI symptoms typically worsen throughout the day with prolonged standing or sitting and improve with leg elevation. The progression from mild discomfort to skin breakdown and ulceration underscores the importance of early evaluation and treatment.
Leg Aching, Heaviness & Fatigue
A persistent sense of heaviness, dull aching, or tiredness in the legs — particularly after prolonged standing or sitting — is often the earliest and most common symptom of venous hypertension and insufficiency.
Ankle & Lower Leg Swelling
Pitting edema of the ankles and lower legs that develops over the course of the day and partially resolves with overnight elevation, reflecting the accumulation of fluid driven into the interstitial tissues by elevated venous pressure.
Varicose Veins
Dilated, tortuous, rope-like superficial veins visible beneath the skin of the thighs and lower legs, representing the outward manifestation of superficial venous reflux and chronically elevated venous pressure.
Skin Discoloration (Hyperpigmentation)
Brown or reddish-brown staining of the skin of the lower leg and ankle, caused by the breakdown of red blood cells that have leaked out of the overpressured venous system and deposited hemosiderin in the surrounding tissue.
Lipodermatosclerosis
Chronic inflammatory changes in the skin and subcutaneous fat of the lower leg, producing firm, indurated, fibrotic tissue with an inverted champagne-bottle appearance. This finding signals advanced CVI and significantly increases the risk of venous ulceration.
Venous Leg Ulcers
Open wounds on the inner ankle or lower leg that develop when the skin, deprived of adequate nutrition by chronic venous hypertension, breaks down. Venous ulcers are often large, shallow, and irregularly bordered, and may persist for months or years without specialized wound care and treatment of the underlying venous disease.
CEAP Classification of Venous Disease
CVI is formally classified using the internationally recognized CEAP system, which grades venous disease from C0 (no visible or palpable signs) through C6 (active venous ulcer). This staging guides treatment planning and helps document disease severity and treatment response over time.
No Signs / Telangiectasias
C0 – C1
No visible venous disease (C0), or the presence of spider veins and reticular veins (C1) without functional venous insufficiency. Symptoms may still be present at this stage.
Varicose Veins
C2
Visible, dilated superficial varicose veins measuring 3 mm or more in diameter. Reflux in the great or small saphenous vein or tributaries is typically present on duplex ultrasound.
Edema
C3
Pitting edema of the ankle and lower leg caused by venous hypertension, without skin changes. This stage often benefits from both compression therapy and procedural treatment of reflux.
Skin Changes
C4
Hyperpigmentation, eczema, lipodermatosclerosis, or atrophie blanche — white scar tissue at the medial ankle — indicating chronic skin injury from venous hypertension.
Healed Venous Ulcer
C5
A venous ulcer that has healed but left behind scarring and persistent skin changes. Without treatment of the underlying venous insufficiency, recurrence is highly likely.
Active Venous Ulcer
C6
An open, active venous ulcer — the most advanced and disabling stage of CVI, requiring coordinated wound care, compression therapy, and ablation of incompetent veins to promote healing.
Risk Factors
Varicose veins arise from a combination of genetic predisposition and lifestyle factors that place chronic stress on the venous system. Understanding these risk factors allows for earlier detection and more proactive management.
Prior Deep Vein Thrombosis (DVT)
DVT is one of the most important risk factors for CVI. Clot within the deep venous system damages or destroys venous valves, leading to post-thrombotic syndrome — a form of CVI that can develop weeks, months, or years after the initial DVT event.
Prolonged Standing or Sitting
Occupations or lifestyles that require prolonged standing — such as healthcare workers, teachers, and retail employees — or extended periods of sitting with leg dependency significantly increase venous pressure and accelerate the progression of venous insufficiency.
Obesity
Excess body weight increases intra-abdominal pressure, impedes venous return from the lower extremities, and is strongly associated with both the development and progression of chronic venous insufficiency and varicose veins.
Family History
A genetic predisposition to venous valve incompetence and varicose veins is well established. Individuals with one or both parents affected by varicose veins or CVI have a substantially elevated lifetime risk of developing the condition themselves.
Pregnancy
Pregnancy increases circulating blood volume, elevates intra-abdominal pressure through uterine enlargement, and exposes venous walls to hormonal relaxation — all of which promote venous dilation and valve incompetence. The risk of CVI increases with each successive pregnancy.
Age
Venous valves deteriorate with age, and the prevalence of CVI increases substantially in patients over 50. Reduced calf muscle pump efficiency with aging further impairs venous return and contributes to the development of venous insufficiency.
Evaluation at VSA
The cornerstone of CVI evaluation is duplex ultrasound — a non-invasive, real-time imaging study that maps the anatomy of the deep and superficial venous systems, identifies incompetent valves, quantifies the degree and distribution of venous reflux, and detects residual deep vein thrombus from prior DVT events. At Vascular Surgical Associates, our accredited Vascular Laboratory performs comprehensive venous duplex studies interpreted by board-certified vascular surgeons with extensive expertise in venous disease.
The evaluation begins with a thorough clinical history documenting symptom duration and progression, prior DVT or superficial thrombosis events, family history of venous disease, prior vein treatments, and the functional impact of symptoms on daily life and work. Physical examination assesses varicose vein distribution, skin changes, edema pattern, and wound characteristics in patients with active or healed ulcers. CEAP classification is assigned based on the combined clinical and ultrasound findings.
For patients with complex CVI — particularly those with suspected deep venous obstruction, iliac vein compression (May-Thurner Syndrome), or recurrent disease following prior treatment — additional cross-sectional imaging with CT venography or MR venography may be obtained to characterize the anatomy above the groin. Intravascular ultrasound (IVUS) may be used in the catheterization suite for more precise assessment of iliac vein disease prior to intervention. The complete evaluation culminates in a detailed, individualized treatment plan developed collaboratively with the patient.
Treatment Options
CVI is a highly treatable condition. Modern minimally invasive techniques allow most patients to be treated in an outpatient setting with rapid recovery and excellent long-term results. Our team selects and sequences treatments based on the pattern of reflux, disease severity, and patient goals.
Compression Therapy
Medical-grade compression stockings are the foundation of CVI management and remain essential before, during, and after procedural treatment. By applying graduated external pressure — greatest at the ankle, tapering toward the knee or thigh — compression reduces venous diameter, improves valve coaptation, and counteracts venous hypertension. Properly fitted stockings of appropriate compression class (typically 20–30 or 30–40 mmHg) significantly reduce symptoms, limit edema, and protect the skin from the inflammatory effects of chronic venous hypertension.
Endovenous Thermal Ablation (EVTA)
Endovenous laser ablation (EVLA) and radiofrequency ablation (RFA) are the gold-standard treatments for great saphenous vein (GSV) and small saphenous vein (SSV) incompetence. Under ultrasound guidance, a thin catheter is inserted into the incompetent vein and heat energy is delivered along the vein wall, causing it to seal permanently. Performed in our office under local tumescent anesthesia, EVTA requires no general anesthesia, leaves no surgical incisions, and allows patients to return to normal activity within 24–48 hours with compression stockings.
Ultrasound-Guided Foam Sclerotherapy (UGFS)
Foam sclerotherapy involves the injection of a sclerosant medication — typically polidocanol or sodium tetradecyl sulfate — that has been agitated into a foam formulation to maximize contact with the vein wall. Guided by real-time ultrasound, foam is injected into incompetent tributaries, perforating veins, or residual varicose veins following EVTA, causing the targeted vein to close and be reabsorbed by the body. UGFS is often used in combination with thermal ablation to treat the full extent of superficial venous disease.
Ambulatory Phlebectomy
For large, bulging varicose vein tributaries that are not amenable to sclerotherapy, ambulatory phlebectomy provides definitive removal through a series of tiny skin punctures — each only 1–2 mm in length — that require no sutures and heal with minimal scarring. Performed under local anesthesia in our office, phlebectomy is commonly performed at the same session as EVTA to comprehensively treat superficial venous disease in a single visit.
Iliac Vein Stenting
In patients whose CVI is driven by deep venous outflow obstruction — including post-thrombotic syndrome and May-Thurner Syndrome — endovascular stenting of the iliac vein restores adequate venous outflow from the leg and dramatically improves CVI symptoms and ulcer healing rates. This catheter-based procedure is performed in our accredited Angio Suite using intravascular ultrasound guidance, allowing precise stent sizing and deployment to restore the obstructed venous segment.
Wound Care Integration
Patients with active venous ulcers (CEAP C6) require coordinated wound care in addition to treatment of the underlying venous insufficiency. Our Wound 360 program provides specialized dressing protocols, biofilm management, and advanced wound therapies that work in concert with venous ablation and compression to accelerate ulcer healing. Treating the venous insufficiency driving the ulcer is essential — without correction of the underlying hemodynamic abnormality, ulcers reliably recur even after temporary closure.
Frequently Asked Questions
Varicose veins are a manifestation of CVI, but the two terms are not interchangeable. CVI is the underlying hemodynamic disorder — venous valve incompetence causing venous hypertension — while varicose veins are the dilated superficial veins that develop as a consequence of that elevated pressure. Many patients with CVI have prominent varicose veins, but CVI can also exist with little or no visible varicosities if the primary insufficiency is in the deep venous system. Conversely, small varicose veins can be present without significant venous reflux or functional impairment. Duplex ultrasound is required to accurately characterize the underlying venous hemodynamics.
In most cases, yes. Chronic venous insufficiency is a progressive condition. Without treatment, venous pressure continues to damage the skin and soft tissue of the lower leg, and patients typically advance through the CEAP stages over years — from edema and skin changes to lipodermatosclerosis and ultimately venous ulceration. Treatment — particularly endovenous ablation of incompetent veins combined with consistent compression — interrupts this progression and prevents the development of the most serious complications, including non-healing wounds and recurrent skin infections. Early treatment produces the best long-term outcomes.
Most patients undergoing endovenous thermal ablation or foam sclerotherapy return to normal daily activity within 24–48 hours. Walking is encouraged immediately after treatment, and most patients resume work within one to two days. Compression stockings are worn for a period after the procedure as directed by your surgeon. Strenuous exercise, prolonged standing, and air travel are typically restricted for a short period. Follow-up duplex ultrasound is performed to confirm closure of the treated vein and rule out superficial or deep vein thrombosis, which is rare but can occur as a complication of endovenous treatment.
Most insurance plans, including Medicare, provide coverage for the treatment of medically significant CVI — particularly when symptoms, skin changes, or ulceration are present and conservative treatment with compression has been documented. Coverage for purely cosmetic concerns such as spider veins and minor reticular veins is typically not covered. Our team assists patients with pre-authorization, clinical documentation, and appeals when needed to ensure that medically necessary treatment is appropriately covered.
Treated veins that are closed with thermal ablation or sclerotherapy do not reopen in the vast majority of cases. However, CVI is a systemic predisposition of the venous system, and new reflux can develop in adjacent veins over time — particularly in patients with a strong family history, ongoing risk factors such as obesity, or post-thrombotic syndrome. Routine surveillance duplex ultrasound after treatment allows early identification of recurrent or new reflux before symptoms progress, and additional treatment can be provided as needed.
