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Vascular Dementia

Vascular dementia is a common type of dementia caused by conditions that damage the blood vessels in the brain or interfere with proper blood flow and oxygen delivery to the brain.



Vasculitis is a group of rare conditions that can occur when you have swelling in the walls of your blood vessels. This can lead to serious health problems.


Venous Thromboembolism

Venous thromboembolism is a condition in which you have blood clots in your veins. The blood clots can block blood flow to your lungs (called a pulmonary embolism). A deep vein thrombosis (DVT) occurs when a blood clot form in a deep vein, usually in the leg.


Ventilator/Ventilator Support

A ventilator is a machine that blows air — or air with extra oxygen — into the lungs. You may need to be put on a ventilator if you have a condition that makes it very hard for you to breathe.


Vitamin B12–Deficiency Anemia

Vitamin B12-deficiency anemia is a condition in which the body can't make enough healthy red blood cells because it doesn't have enough vitamin B12.



Wolff-Parkinson-White Syndrome

Wolff-Parkinson-White syndrome is a problem with the heart’s electrical system that controls the heartbeat that can make the heart beat too quickly or with an irregular rhythm.


Clinical Trials

The NHLBI leads and supports many clinical trials to help find new ways to prevent, detect, and treat heart, lung, blood, and sleep disorders.

Fact Sheets and Handouts

The NHLBI develops materials for patients and health professionals on many heart, lung, blood, and sleep conditions. Information from the NHLBI is based on the latest scientific findings.