Venous Insufficiency and Varicosities
Chronic venous insufficiency is a common clinical problem whose presentation ranges from mildly unsightly venous dilation to recurrent cellulitis and ulceration requiring frequent hospitalizations. An estimated 20% of the US adult population has some degree of varicose veins, and up to 5% have advanced chronic venous insufficiency and venous ulceration.
The venous system of the lower extremities is composed of deep veins that lie within the muscular compartments and superficial veins that lie outside the deep fascia and muscles. Although the underlying etiology is not fully understood (genetic, hormonal, and environmental factors have been postulated), these disorders result from chronic venous hypertension, which can be caused by incompetence of the venous valves, venous thrombosis or obstruction, and/or failure of the muscular “venous pump” (the pumping effect that occurs upon contraction of leg muscles during walking and other activities).
Telangiectasias and reticular veins are dilated intradermal and subdermal veins, respectively. They are present in about 50%-60% of individuals, with women being more commonly affected than men. ,
Varicose veins are dilated, tortuous, subcutaneous veins usually greater than 3 mm in diameter. They are present in 10%-30% of the general population and are particularly frequent in older individuals and women. , Most are asymptomatic. However, clinical symptoms may include swelling, aching, tension, leg fatigue, burning, and pruritus, which may be relieved with recumbency or leg elevation.
Chronic venous insufficiency is determined by the presence of edema, skin changes, or ulceration, which, if left untreated, can be limb- or life-threatening. Six to seven million people in the US are affected. Its prevalence increases with age, and it is twice as common in women as men.
Female gender. Venous insufficiency and varicosities occur up to twice as often in women as men.
Tall height. The association with height is thought to be due to the effect of gravity and pooling of blood in the lower extremities.
History of leg injury, phlebitis, or deep venous thrombosis raises the risk for venous insufficiency.
Lifestyle factors. Prolonged standing sedentary lifestyle, smoking, and pregnancy are suspected risk factors for the development of varicose veins, and obesity raises risk for venous disorders. Physical inactivity is associated with risk for chronic venous insufficiency and varicose veins in some, , although not all, studies.
Klippel-Trenaunay-Weber syndrome. This rare congenital condition occurs due to an abnormal or absent deep venous system and results in a triad of extensive unilateral varicose veins, limb hypertrophy, and one or more port-wine stains.
Diagnosis typically rests on symptomatology with confirmation of venous reflux by Doppler ultrasound. Additional testing is generally reserved for severe cases or when intervention is planned.
Doppler venous ultrasound gives information about the anatomy and flow patterns of the venous system. It accurately maps the veins of the leg and identifies the location and severity of valvular incompetence. In addition, it evaluates for deep venous thrombosis, which is fairly common in these patients. Ankle-brachial index (ankle-to-brachial blood pressure ratio) is calculated in conjunction with Doppler ultrasound to assess the presence of concurrent arterial disease, which is common in patients with venous disease.
Venography is an invasive method for evaluating the venous system. It is rarely used due to the safety and accuracy of Doppler ultrasound. However, venography is useful in some patients, particularly those who will undergo vascular surgery.
Initial conservative management is recommended for most patients. Bed rest, leg elevation, and compression stockings or bandages improve blood flow, reduce inflammation and edema, and compress dilated veins. Compression stockings act by decreasing venous pressure and reflux. They should be able to exert 20-30 mm Hg at the ankle with a decreasing pressure gradient toward the knee (note that compression stockings are different from the “antiembolism” stockings used in hospitals for DVT prevention, which exert less than 10 mm Hg).
Intermittent pneumatic compression pumps can be used for several hours daily and may be more effective than compression stockings or bandages.
Several drug therapies have been used. Diuretics may be used in patients with severe edema. Aspirin and oral antibiotics may be used to accelerate the healing of venous ulcers.
Venous ablation by injection sclerotherapy is useful in some patients with varicose veins for whom conservative therapies have failed. Laser therapy is the only option for treatment of telangiectasias that are too small.
Several surgical options are available and have high success rates. These include venous ligation with or without stripping, endovenous catheter ablation, and valvular reconstruction.
Chronic venous insufficiency and varicose veins appear to be related to an obesity-promoting Western lifestyle poor in dietary fiber and low in physical activity. Evidence suggests that avoidance of these risk factors may reduce the incidence of venous disorders. In persons with established venous insufficiency and varicose veins, the therapeutic applications of flavonoid-containing botanicals may strengthen blood vessels by increasing collagen cross-linking in the vascular endothelium.
In observational studies, the following factors are associated with reduced risk of venous disorders:
Denis Burkitt, known for the identification and treatment of Burkitt’s lymphoma, hypothesized that varicose veins result from a fiber-poor diet that leads to constipation-induced straining during defecation. This straining may raise intra-abdominal pressure, causing transmission of pressure to the major venous trunks draining the leg veins. (Dr. Burkitt hypothesized a similar mechanism for the pathogenesis of hemorrhoids.) The resulting retrograde blood flow to these veins may in turn result in a dilation of the proximal segment of the veins and failure of the valves in a sequential manner. Further abdominal straining and the presence of unsupported blood in the veins cause a deterioration in vascular integrity.,
Although this hypothesis has not been proven, epidemiological evidence supports a relationship between a lack of fiber and the prevalence of varicose veins. The presence of varicose veins in some developing regions is associated both with increases in refined (fiber-poor) carbohydrate and decreases in stool weight. Straining during defecation resulted in an almost 3-fold higher risk for the prevalence of both mild and severe trunk varices, but this was observed in men only. Subjects with trunk varicose veins and those with chronic venous insufficiency had higher levels of haemostatic factors (fibrinogen, tissue plasminogen activator [tPA], and von Willebrand factor) compared with those without trunk varices or chronic venous insufficiency. Although additional studies are needed to investigate the role of a high-fiber diet in varicose vein prevention, low-fat, high-fiber diet interventions have reduced tPA and increased fibrinolysis, , indicating their usefulness in the prevention of varicosities.
Avoidance of Overweight
Obesity has not been consistently associated with chronic venous insufficiency. However, most studies have shown that overweight and obese women are more likely to develop varicose veins. Women who are moderately overweight (BMI = 25.0-29.9 kg/m 2) have a 1.5-fold increased risk of varicose veins, compared with nonoverweight women. Women with a BMI ≥ 30 have a 3-fold greater risk. Obesity prevention appears to be more effective than obesity treatment. Obesity surgery was not effective for improvement of venous insufficiency. For details on dietary contributors to and treatments for obesity, see the Obesity chapter.
Certain botanical treatments have demonstrated promise for treating chronic venous insufficiency in limited clinical trials. These include the following:
Horse chestnut seed. A systematic review of the use of horse chestnut seed ( Aesculus hippocastanum) for chronic venous insufficiency concludes that it probably reduces lower leg volume and may reduce ankle and calf swelling. The active component (aescin) appears to promote blood circulation and may strengthen the elasticity of veins. The common dosage of horse chestnut is 300 mg twice daily, containing 50 mg of aescin in each dose.
Diosmin-hesperidin combination. Long-term controlled clinical trials have revealed that this combination (Daflon 500 mg twice daily) of flavonoids increases venous tone, improves lymphatic drainage, and reduces capillary hyperpermeability, with resultant changes in chronic venous insufficiency and associated venous conditions. These improvements included significant decreases in ankle and calf circumferences, functional discomfort (nocturnal cramps and sensations of leg heaviness, swelling, or heat), and plethysmographic parameters, such as venous capacitance, distensibility, and emptying., A recent meta-analysis of controlled clinical trials indicated that adding Daflon 500 mg twice daily increased the likelihood of healing venous leg ulcers by 32%, compared with conventional therapy alone.
Butcher’s broom. Extracts of Ruscus aculeatus (150 mg 2-3 times/day) improve venous insufficiency through inhibition of the permeability-inducing effect of histamine, bradykinin, and leukotriene B4.Butcher’s broom is particularly effective when combined with another flavonoid (hesperidin) and vitamin C. Benefits include improved venous emptying; decreased capillary filtration rate; reduction of pain severity, cramps, heaviness, paresthesia, venous capacity, and severity of edema; and decreases in calf and ankle circumference.,
What to Tell the Family
Some evidence suggests that venous insufficiency and varicose veins may be, in part, preventable through a high-fiber, low-fat diet; regular exercise; and maintenance of normal body weight. Medical, surgical, and botanical approaches are available for treatment.
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