What is a venous venography?
Venous imaging–venography–is an imaging process for evaluating veins structurally and functionally. With suspected venous disease, ultrasound is the first step to explore whether further diagnostics are warranted. If so, venography via CT or MRI can be used to help design therapeutic or surgical strategies to treat the abnormality. Although oral contrast is sometimes used, venography usually requires the injection of contrast material which itself can cause deep vein thrombosis. This risk is small and is much less hazardous than allowing venous disease to remain undiagnosed.
Veins anywhere in the cardiovascular system can present with chronic venous disorders that interfere with functional return of deoxygenated blood to the heart and threaten the tissue affected by the compromise of venous drainage. When venous drainage is not optimal, the normal gaseous exchange between arterial and venous interaction at the tissues (oxygen and carbon dioxide) can fail, leading to injury of the tissues involved in this failure.
Age and immobility are two frequent causes of venous disorders. The valves within veins, which keep blood from backing up, can deteriorate with age in some people. They can also be destroyed by clots (thrombi), which leads to venous insufficiency and to increased pressure from the pooled blood, called venous hypertension. Immobility prevents the pumping action of the legs from contributing to the flow upwards toward the heart.
Chronic venous disorders are classified by a system based on
- Clinical signs
Chronic Venous Disease
Chronic venous disease refers to abnormalities in venous structure or function that present symptoms or signs requiring further investigation or treatment:
- Extremity tingling
- Pain, aching, or burning
- Skin irritation or changes
- Dilated veins (telangectasias, varicosities)
- Clinical edema
Chronic Venous Insufficiency
Chronic venous insufficiency refers to chronic venous disease with more serious clinical signs, such as significant edema and changes in the skin, including ulceration.