What is magnetic resonance venography (MRV)?

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Magnetic resonance venography (MRV) is an imaging test used to visualize veins in the body. Veins are blood vessels that return blood from your body's organs to your heart and lungs, so your blood can be replenished with oxygen and nutrients.

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How MRI Venography Works

It may not surprise you that MRV is performed with the same medical equipment that is used for magnetic resonance imaging (MRI), which is a large machine that uses a complex and fascinating technique to create an image that represents what is happening inside the body) …

In particular, the MRI machine uses special magnets that "read" information, which is then sent to a computer with built-in calibrated software that can interpret the information generated by the magnetic equipment.

This information is used to recreate a body image that your healthcare team can examine when evaluating your medical problem.

The MRI machine can be set up to view images of various parts of the body, including shapes, hard areas, and blood or blood vessels. Sometimes MRI is used to view tumors, injuries, and diseases such as stroke .

When imaging blood vessels, it is important not to confuse magnetic resonance angiography (MRA) with MRV. MRA is used to examine arteries (the type of blood vessels that carry oxygen-rich blood to organs), while MRV examines veins.

Appointment of magnetic resonance venography.

MRV is used to assess blood flow in the veins and can detect blood clots or other abnormalities. Most serious blood vessel diseases, such as strokes and heart attacks, are caused by artery problems, not vein problems.

In general, venous disease is less common than arterial disease. Also, more often, diseases associated with vein disease are less serious than those caused by arterial disease.

This is why you hear more about MRI (which creates an image of the organ itself, and not so much about blood vessels) or MRA (which aims to create an image of an artery) than you do about MRV. .

The big picture here is that if you need an MRV, your healthcare provider is likely evaluating you for a less common health problem that may take time to diagnose. Some of these problems include structural abnormalities of the veins or problems with blood flow in the brain, venous malformations in a very young child, and / or blood clots that affect the veins rather than the arteries.

A specific condition that is tested with MRV is called cerebral vein thrombosis, which is a blood clot in the veins of the brain. Although strokes and brain disorders are very rare in young women of childbearing age, the risk increases slightly during pregnancy.

Also, at times, the brain structure of a developing or nursing child may not look as expected, and brain MRV can provide some indication as to whether blood flow or abnormal vein structure may be a contributing factor. Finally, conditions such as intracranial hypertension can cause neurological symptoms that can be assessed using MRV.

Contraindications for MRV

An MRI machine uses a magnet, so you cannot have an MRV (or MRI or MRA) if a metal device is implanted in your body. The force of the powerful magnet used in the MRI machine can cause serious problems, such as misalignment or injury to the magnet. Similarly, if you have a pacemaker, the magnet can cause a malfunction with potentially serious consequences .

Get the word of drug information

MRV is not a routine diagnostic test. If you are being tested for a specific medical condition or have a health problem that takes time to diagnose, you may be concerned about what to expect. As you go through this process, be sure to get the most out of your health care by asking questions and talking to your health care team.

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