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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «V»:

  1. Varicose veins Varicose veins
    Varicose veins are swollen, twisted, and sometimes painful veins that have filled with an abnormal collection of blood. See also: Varicose vein stripping Varicose vein - noninvasive treatment Venous insufficiency Causes In normal veins, valves in the vein keep blood moving forward toward th...
  2. Varicose veins - what to ask your doctor Varicose veins - what to ask your doctor
    Varicose veins are abnormally swollen, twisted, or painful veins that have filled with blood. They usually happen in the legs. Below are some questions you may want to ask your doctor or nurse to help you take care of your varicose veins. Questions What are varicose veins? What causes them? What m...
  3. Vascular ring Vascular ring
    Vascular ring is an abnormal formation of the aorta, the large artery that carries blood from the heart to the rest of the body. It is a congenital problem, which means it is present at birth. See also: Double aortic arch Causes Vascular ring is rare. It accounts for less than 1% of all congenital...
  4. Vasectomy Vasectomy
    A vasectomy is surgery to cut the vas deferens, the tubes that carry a man’s sperm from his scrotum to his urethra. The urethra is the tube that carries sperm and urine out of the penis. After a vasectomy, sperm cannot move out of the testes. A man who has had a successful vasectomy cannot ma...
  5. Vasoactive intestinal polypeptide Vasoactive intestinal polypeptide
    Vasoactive intestinal polypeptide (VIP) is a substance found throughout the body, but the highest levels normally occur in the nervous system and gut. VIP has many functions: It helps control or send nerve signals It helps relax certain muscles along the gastrointestinal tract It increases the amou...
  6. Vasoconstriction Vasoconstriction
    Vasoconstriction is the narrowing (constriction) of blood vessels by muscles in their walls. When blood vessels constrict, the flow of blood is restricted or slowed. Vasoconstriction may be slight or severe. It may result from disease, medication, or psychological conditions. Medications that cause ...
  7. Vasomotor rhinitis Vasomotor rhinitis
    Vasomotor rhinitis is a nonallergic condition that involves a constant runny nose, sneezing, and nasal congestion. See also: Allergic rhinitis Rhinitis Causes Vasomotor rhinitis is not caused by an infection or allergy. The exact cause is unknown. Symptoms are triggered by something that irri...
  8. VDRL test VDRL test
    The VDRL test is a screening test for syphilis. It measures substances, called antibodies, that can be produced in response to Treponema pallidum, the bacteria that causes syphilis. The test is similar to the newer rapid plasma reagin (RPR) test. How the Test is Performed The test is usually perfor...
  9. Vegetarianism Vegetarianism
    A vegetarian diet is a meal plan that contains little or no animal products. Types of vegetarian diets include: Vegan: Diet consists of only foods of plant origin. Lacto-vegetarian: Diet consists of plant foods plus some or all dairy products. Lacto-ovovegetarian: Diet consists of plant foods, dai...
  10. Venipuncture Venipuncture
    Venipuncture is the collection of blood from a vein, usually for laboratory testing. How the Test is Performed Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an ela...
  11. Venogram Venogram
    A venogram is a way to look at veins in your body using x-rays and a special dye called contrast. It is most often use to look at veins in the legs and belly area (abdomen). Veins are not normally seen in an x-ray. That is why the special dye is used. The health care provider injects this dye into a...
  12. Venogram - leg Venogram - leg
    Lower extremity venography is a test used to see the veins in the leg. X-rays are a form of electromagnetic radiation like light, but of higher energy, so they can go through the body to form an image on film. Structures that are dense (such as bone) will appear white, air will be black, and other ...
  13. Venous insufficiency Venous insufficiency
    Venous insufficiency is a condition in which the veins have problems sending blood from the legs back to the heart. See also: Deep venous thrombosis Stasis dermatitis and ulcers Varicose veins Causes Venous insufficiency is caused by problems in one or more deeper leg veins. Normally, valve...
  14. Ventricular assist device Ventricular assist device
    Ventricular assist devices (VAD) help your heart pump blood from the main pumping chamber of your heart (the left ventricle) to the rest of your body. These pumps may be implanted in your body or connected to a pump outside your body. Description A ventricular assist device has three parts: A pump...
  15. Ventricular fibrillation Ventricular fibrillation
    Ventricular fibrillation (VF) is a severely abnormal heart rhythm (arrhythmia) that can be life-threatening. Causes The heart pumps blood to the lungs, brain, and other organs. Interruption of the heartbeat for only a few seconds can lead to fainting (syncope) or cardiac arrest. Fibrillation is an ...