Birmingham Vein Center Venous System

Venous System Anatomy

Venous System Anatomy

The veins in the lower limbs are classified into two systems:

  • Superficial Veins (including saphenous)
  • Deep Veins

The two systems are connected by perforating veins that pass through the deep fascia at mid-thigh, knee and ankle. The diagram shows the veins of the superficial system in blue and pink and the deep system in gray. The great saphenous vein is highlighted in pink.

Three factors influence the return of blood back to the heart:

  1. Respiration - the movement of the diaphragm creates a negative pressure that assists the return of blood from the legs to the heart
  2. Vein Valves - healthy valves close, preventing blood from refluxing or pooling
  3. Calf Muscle Pump - action of the calf muscle helps to force blood upward

Venous Insufficiency

Venous insufficiency, a.k.a., venous reflux, is the impaired return of venous blood from the legs and feet, often manifesting as varicose veins, swollen ankles, aching legs, skin changes or venous ulcers.

In many cases, venous insufficiency is the result of over-dilation of the venous vessels in the legs. This dilation eventually prevents the valve cusps from closing properly resulting in reflux. The pooling of blood results in ineffective flow back to the heart.

In some cases the reflux is caused not only by the over dilation of the vessel wall, but also by damaged or absent valves.

One of the most common clinical manifestations of venous insufficiency is varicose veins. Varicose veins are superficial veins that have dilated in response to increased pressure due to incompetent valves. These varicose veins progressively worsen, and often manifest into other symptoms, if left untreated.

Patients presenting with varicose veins should be referred to a surgeon or vein specialist to undergo a physical examination and/or in-depth evaluation, including a duplex ultrasound study.

Common Symptoms Of Venous Insufficiency

In the absence of other symptoms, patients with cosmetic concerns due to the presence of varicose veins might be evaluated with only a physical examination. However, patients presenting with other symptoms of venous insufficiency, such as those listed below, should also undergo an in-depth evaluation, including a duplex ultrasound study.

  • Leg pain, aching, tired or weak legs, especially after long periods of standing or sitting
  • Varicose veins
  • Burning or itching of the skin
  • Swollen legs and/or swollen ankles (edema)
  • Color and texture changes of the skin
  • Open wounds (skin ulcers)

Venous Reflux Education Video

Varicose Veins

Varicose veins are typically found in the superficial venous system and often involve the main trunk veins - the great and small saphenous veins - as well as tributaries.

Varicose veins are superficial veins that have expanded in response to increased pressure caused by incompetent or absent valves. This dilation eventually prevents the valve cusps from closing properly resulting in reflux. Alternatively, a lack of competent valves can also cause dilation of the vein. As one valve fails, increasing pressure is exerted on each more distal valve until they, too, become incompetent. Diameters of varicose veins can range from 3 mm to > 8 mm.2

The disease is typically progressive and if left untreated can encompass the entire vessel and can ultimately affect the deep system.

Edema & leg or ankle swelling with and without skin changes

Edema and swollen ankles are the next progressive states of venous insufficiency and occur as the result of venous hypertension forcing fluid into the lymphatic and interstitial spaces.

This can cause leg or ankle swelling and changes in skin pigmentation. Severe pain and discomfort are typical of these conditions, particularly in the lower leg (calf & ankle) where proximity of nerves exacerbates the situation. In addition to superficial involvement, these stages usually include some portion of the deep vein system (including perforators).

Active & Healed Venous Ulcers

Venous ulcers indicate the most severe forms of venous insufficiency and typically involve both the deep (including perforators) and superficial vein systems. Extreme reflux and venous hypertension result in changes in the microcirculation of the skin eventually leading to severe ulceration.

Anatomic involvement at these stages generally involves the saphenous system3, the perforators (typically the Cockett perforators), and the deep system (typically the femoral, superficial femoral and/or the profunda). A smaller subset of the population has deep system-only involvement (<5%) and an even smaller portion perforator-only incompetence.

What's new in Varicose Vein management?
The Closure procedure treats superficial venous reflux disease in leg veins.
VNUS Closure Procedure

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Conservative Therapy
Venous Duplex Scanning
Phlebectomy
VNUS Closure
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