What Is Chronic Venous Insufficiency?
Chronic venous insufficiency (CVI) is a condition in which the veins of the lower limbs cannot efficiently return blood to the heart. It results from incompetence of the venous valves, venous obstruction, or failure of the calf muscle pump, producing sustained venous hypertension.
Chronic venous hypertension leads to a spectrum of manifestations ranging from telangiectasias and varicose veins to edema, skin changes such as hyperpigmentation and lipodermatosclerosis, and venous ulcers. CVI is one of the most prevalent vascular diseases, affecting up to 40% of women and 17% of adult men.
Although often viewed as a cosmetic concern, CVI is a progressive disease that can cause significant morbidity. Venous ulcers, in particular, have a major impact on quality of life and health-care costs, with recurrence rates of 50-70%.
Venous Hypertension
Incompetent venous valves allow reflux, raising pressure in the lower-limb veins, especially when standing.
Progressive Disease
Without treatment, CVI progresses from varicose veins to edema, skin changes, and eventually venous ulcers that are difficult to heal.
High Prevalence
Affects up to 40% of women and 17% of adult men. Risk factors include heredity, obesity, pregnancy, and prolonged standing.
Pathophysiology
Venous return from the lower limbs depends on three mechanisms: competent venous valves (which prevent reflux), the calf muscle pump (which propels blood during walking), and the thoracoabdominal pressure gradient. Failure of any component generates venous hypertension.
The most common cause is primary valvular incompetence, often with a genetic predisposition. Prior deep vein thrombosis causes CVI through residual obstruction and valvular destruction (post-thrombotic syndrome). Sustained venous hypertension drives leakage of fluid, proteins, and red blood cells into the interstitium.
At the microvascular level, chronic venous hypertension activates leukocytes that adhere to the endothelium, releasing proteolytic enzymes and free radicals. This causes chronic inflammation, pericapillary fibrosis, tissue hypoxia, and eventually ulceration. Hemosiderin deposited from the breakdown of extravasated red blood cells produces the characteristic hyperpigmentation.
Symptoms
Symptoms of CVI vary with disease stage. The CEAP classification (Clinical, Etiologic, Anatomic, Pathophysiologic) is the standardized staging system. Symptoms typically worsen with prolonged standing and improve with limb elevation.
Symptoms of Chronic Venous Insufficiency
- 01
Heavy and tired legs
Heaviness and fatigue in the lower limbs, especially at the end of the day or after prolonged standing.
- 02
Lower-limb edema
Swelling that worsens through the day and improves with leg elevation and overnight rest. Initially reversible, it becomes persistent.
- 03
Varicose veins and telangiectasias
Dilated and tortuous veins visible under the skin. Telangiectasias ("spider veins") are dilated thin veins up to 1 mm.
- 04
Pain and burning
Dull or burning pain in the lower limbs that worsens with standing and improves when the legs are raised.
- 05
Skin hyperpigmentation
Brownish darkening of the skin, especially over the medial ankle, from hemosiderin deposition.
- 06
Venous ulcer
Wound usually located over the medial malleolus, with irregular borders and a granulation-tissue base. May take months to heal.
CEAP CLINICAL CLASSIFICATION
| CLASS | DESCRIPTION |
|---|---|
| C0 | No visible or palpable signs of venous disease |
| C1 | Telangiectasias or reticular veins (<3 mm) |
| C2 | Varicose veins (varicose veins >3 mm) |
| C3 | Edema of venous origin |
| C4a | Venous eczema and/or hyperpigmentation |
| C4b | Lipodermatosclerosis and/or atrophie blanche |
| C5 | Healed venous ulcer |
| C6 | Active venous ulcer |
Diagnosis
Diagnosis of CVI is primarily clinical, complemented by color Doppler ultrasonography (venous duplex), which is the first-line study. The duplex identifies valvular reflux (reflux time >0.5 seconds in superficial veins or >1 second in deep veins), venous obstruction, and incompetent perforators.
The exam should be performed with the patient standing, evaluating the superficial venous system (great and small saphenous), the deep system (femoral, popliteal, tibial), and perforators. It is essential for treatment planning, identifying the anatomic pattern of reflux and guiding which procedures are indicated.
Differential Diagnosis
Lower-limb edema is the most common symptom of chronic venous insufficiency, but it has a broad differential diagnosis — cardiac, renal, and lymphatic causes must be systematically evaluated.
DIFFERENTIAL DIAGNOSIS
Differential Diagnosis
Heart Failure
- Bilateral limb edema + dyspnea
- Jugular venous distention
- Pulmonary crackles
- Decompensated HF = urgent cardiology referral
Diagnostic Tests
- BNP
- Echocardiogram
Deep Vein Thrombosis
- Acute unilateral onset
- Painful firmness
- Warmth and erythema
- DVT = urgent anticoagulation
Diagnostic Tests
- Venous Doppler
- D-dimer
Lymphedema
- Non-pitting edema
- Toe involvement
- After surgery with lymph node dissection
Diagnostic Tests
- Lymphoscintigraphy
Renal Failure
- Bilateral edema
- Proteinuria
- Elevated creatinine
Diagnostic Tests
- Creatinine
- Urinalysis
Lipedema
- Women
- Symmetric fat deposition in legs
- Spared feet
- Does not improve with diet
Diagnostic Tests
- Clinical exam
- Exclusion of systemic causes
DVT: An Emergency That Mimics Venous Insufficiency
Deep vein thrombosis (DVT) can present identically to a CVI flare — unilateral edema with heaviness and leg pain. Distinguishing features include: acute onset (CVI is chronic), painful muscle firmness on palpation, local warmth and erythema, often with risk factors for thrombosis (immobilization, recent surgery, malignancy, oral contraceptives, long flights). The Wells score estimates the clinical probability of DVT.
D-dimer has high sensitivity (less than 500 mcg/L excludes DVT with high probability when pretest probability is low) but low specificity. Lower-limb venous Doppler is confirmatory. Anticoagulation should be started immediately after diagnosis to prevent pulmonary embolism. Any acute-onset unilateral edema with the features described requires immediate evaluation.
Lymphedema vs. Venous Insufficiency: Clinical Distinction
Lymphedema results from obstruction or dysfunction of the lymphatic system, causing proteins and fluids to accumulate in the subcutaneous tissue. Unlike venous edema, lymphedema is non-pitting (no pit) or leaves a pit that recovers slowly, involves the toes (Stemmer sign: inability to pinch the skin of the second toe), and does not improve with elevation. Progressive skin fibrosis creates a "peau d&após;orange" appearance and thickened skin.
Secondary lymphedema is more common: it follows surgical lymph node dissection (mastectomy with axillary dissection) or radiotherapy. Primary lymphedema is rare, from congenital dysfunction. Lymphoscintigraphy is the gold standard for assessing lymphatic flow. Treatment — manual lymphatic drainage, compression bandaging, compression garments, and specific exercises — differs significantly from CVI management.
Lipedema: The Condition Frequently Confused With Obesity
Lipedema is an adipose tissue disease that predominantly affects women, characterized by symmetric, painful fat deposition in the legs — typically sparing the feet (a striking contrast between ankle and foot). The skin is hypersensitive to touch and bruises easily. Unlike common obesity, it does not improve with diet or exercise, and may progress to lipolymphedema when associated lymphatic involvement develops.
Diagnosis is clinical — no specific laboratory or imaging test exists. Treatment is mainly conservative: manual lymphatic drainage, compression, an anti-inflammatory diet, and aquatic exercises. Specialized liposuction (low-pressure tumescent liposuction) may be indicated in selected cases to reduce volume and pain.
Treatment
Treatment of CVI is escalated according to severity. Compression therapy is the cornerstone of conservative management, while minimally invasive and surgical procedures are indicated for significant reflux in saphenous or perforator veins.
Behavioral Measures
ContinuousAvoid prolonged standing, elevate the limbs at rest (above heart level), exercise regularly (walking, swimming), and control weight. Calf contraction during walking activates the venous muscle pump.
Compression Therapy
Continuous during the dayGraduated compression stockings: 20-30 mmHg for symptomatic varicose veins, 30-40 mmHg for edema and skin changes, 40-50 mmHg for venous ulcers. Inelastic compression bandaging for active ulcers.
Venoactive Agents (Phlebotonics)
Cycles of 3-6 monthsMicronized purified flavonoid fraction (diosmin/hesperidin): reduces edema, pain, and leg heaviness. Improves ulcer healing. Escin (horse chestnut extract): evidence for relief of edema and symptoms.
Procedures and Surgery
As indicatedThermal ablation (endovenous laser or radiofrequency): treats saphenous reflux. Sclerotherapy: for telangiectasias and reticular varicose veins. Conventional surgery (saphenectomy): selected cases.
Acupuncture as Treatment
Acupuncture may serve as complementary therapy in CVI through mechanisms that include improvement in microcirculation, modulation of the inflammatory response, and an analgesic effect. Studies with laser-Doppler flowmetry show that acupuncture may increase local cutaneous blood flow and improve microvascular perfusion.
Proposed mechanisms — extrapolated mainly from experimental studies and small clinical trials — include possible local release of vasodilators (nitric oxide, CGRP), modulation of sympathetic vasomotor tone, and effects on inflammatory cytokines. Biological plausibility exists, but clinical translation into solid outcomes is still limited. In practice, the role attributed to acupuncture is symptomatic: helping control pain, edema, and the sensation of heavy legs.
In clinical practice, acupuncture is considered a complementary option for symptomatic relief in CVI, especially for patients with pain, edema, and a sensation of heaviness in the lower limbs. It does not replace compression therapy, which remains the cornerstone of treatment.
Prognosis
CVI is a chronic, progressive disease. With adequate conservative treatment (compression, exercise, weight control), most patients can control symptoms and prevent progression. Without treatment, the disease tends to advance to more severe stages over years.
Venous ulcers represent the most advanced stage and carry the worst prognosis. With adequate compression, 70-80% of ulcers heal within 6 months. However, the recurrence rate is high (50-70% at 5 years), especially when compression is discontinued. Reflux ablation procedures significantly reduce recurrence.
Myths and Facts
Myth vs. Fact
Varicose veins are only a cosmetic concern.
Varicose veins can be a sign of significant venous insufficiency. Without treatment, they may progress to edema, skin changes, and ulcers. They also increase the risk of superficial and deep vein thrombosis.
Myth vs. Fact
Crossing your legs causes varicose veins.
Crossing the legs does not cause varicose veins. The main risk factors are heredity, pregnancy, obesity, prolonged standing, and age. Genetics is the predominant factor in predisposition to CVI.
Myth vs. Fact
Compression stockings are uncomfortable and unnecessary.
Modern compression stockings are far more comfortable than older ones. They are the cornerstone of CVI treatment and significantly reduce symptoms, edema, and disease progression. Adherence to compression is the most important factor in management.
When to Seek Help
Frequently Asked Questions
Frequently Asked Questions
Chronic venous insufficiency has no definitive cure, since valvular incompetence is irreversible without intervention. However, adequate treatment — compression, an active lifestyle, venoactive drugs, and, when indicated, procedures to ablate incompetent veins — can effectively control symptoms and prevent progression to venous ulcers.
Yes. Graduated compression stockings (higher pressure at the ankle, lower at the thigh) are the cornerstone of conservative CVI treatment. They reduce edema, relieve symptoms (heaviness, pain, cramps), improve venous return, and prevent progression of trophic lesions. 20-30 mmHg compression is adequate for most cases; severe forms require 30-40 mmHg. Put them on in the morning before getting up.
Clinical studies suggest acupuncture may improve CVI symptoms — edema, pain, and nighttime cramps — by improving microcirculation and modulating vascular tone. It can complement conventional treatment, especially for patients with persistent symptoms despite compression stockings and venoactive agents. The acupuncture physician evaluates the indication individually.
Intervention (conventional surgery, sclerotherapy, endovenous laser, or radiofrequency) is indicated for: symptomatic varicose veins (pain, edema, burning) refractory to conservative treatment, recurrent thrombophlebitis, varix bleeding, or progression to an active or healed venous ulcer. Venous duplex ultrasound guides the choice of technique based on the reflux pattern.
Yes, with frequency that varies by technique and individual factors. The 5-year recurrence rate is 20-40% after conventional surgery. Endovenous techniques (laser, radiofrequency) have similar or slightly better rates. Continued use of compression stockings, adequate weight, and regular physical activity reduce the risk of recurrence. New varicose veins may appear in different veins regardless of prior treatment.
Varicose veins themselves do not cause cancer. However, recurrent superficial thrombophlebitis can occasionally be a manifestation of paraneoplastic syndrome (Trousseau sign). More importantly: very long-standing chronic venous ulcers (decades) may rarely evolve into squamous cell carcinoma (Marjolin ulcer). Any venous ulcer that does not heal within 3 months with adequate treatment should be biopsied.
Yes. Nighttime cramps in the lower limbs are frequent CVI symptoms, caused by local tissue hypoxia from venous stasis and electrolyte imbalance. Daytime compression stockings reduce nighttime cramps in many patients. Adequate hydration, magnesium supplementation, and stretching before sleep are complementary measures. Very frequent or severe cramps should be investigated to rule out other causes (neuropathy, hypothyroidism).
Yes. Pregnancy is an important risk factor for CVI and varicose veins — blood volume increases by 50%, the uterus compresses the iliac veins reducing venous return, and progesterone relaxes the venous walls. Gestational varicose veins develop in 10-20% of pregnant women. Most improve spontaneously within 3 months after delivery. Compression stockings are safe and indicated during pregnancy for women with CVI.
With adequate treatment — multilayer elastic compression (gold standard), moist dressings, and infection treatment when present — 60-70% of venous ulcers heal in 3 to 6 months. Large, long-standing, or infected ulcers may take longer. The recurrence rate is high (50-70% at 5 years) without maintenance compression therapy. After healing, compression stockings should be maintained indefinitely.
Beneficial habits include: walking regularly (the calf muscle pump is essential for venous return), avoiding long periods of standing or sitting still, elevating the lower limbs above heart level for 15-30 minutes several times a day, maintaining adequate weight, and avoiding tight clothing at the groin. Foods rich in flavonoids (berries, citrus fruits, teas) have documented venoactive properties. Excess sodium worsens edema.
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