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   Blood vessels that carry blood from the arms, legs, head and body organs back to the heart.


The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.

An appendage in anatomy and in clinical trials. See: Arm.

The hollow, muscular organ responsible for pumping blood through the circulatory system.


A blood vessel that carries blood from the body back into the heart.

Veinamine 8 per cent
Veinamine 8 per cent is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): amino acids; magnesium chloride; potassium acetate; potassium chloride; sodium acetate.


Vitreous Humor
The clear jelly (gel) that fills the center of the eye.

To empty the bladder in order to obtain a urine sample for testing.

Balloon valvotomy is when a balloon is used to at the time of cardiac catheterization to increase the area of a narrowed valve.

Variant Angina
A type of angina that occurs at rest. Most often due to coronary spasm.

Vena Cava
The two large veins that collect blood returning from all parts of the body and return it to the heart (right atrium) The inferior vena cava brings blood from the lower half of the body; and the superior vena cava brings blood from the upper half.


Venous Duplex Ultrasound
A non-invasive imaging procedure that uses high-frequency sound waves to determine the presence of clots in the arms or legs.

Venous Thrombosis
A blockage in a vein caused by a thrombus.

The lower, pumping chambers of the heart. The heart has two ventricles - the right and left ventricle.

Ventricular Fibrillation
An erratic, disorganized firing of impulses from the ventricles. The ventricles quiver and are unable to contract or pump blood to the body. This is a medical emergency that must be treated with cardiopulmonary resuscitation (CPR) and defibrillation as soon as possible.

Ventricular Rupture
In patients who suffer a significant heart attack, it is sometimes the case that the area of the muscle wall of the heart that is affected can become so weakened that it ruptures and leaks blood from the inner chamber of the heart.

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