Deep Vein Thrombosis (DVT)

Deep vein thrombosis (DVT, also called venous thrombosis) occurs when a thrombus (blood clot) develops in veins deep in your body because your veins are injured or the blood flowing through them is too sluggish. The blood clots may partially or completely block blood flow through your vein. Most DVTs happen in your lower leg, thigh or pelvis, but they also can occur in other parts of your body including your arm, brain, intestines, liver or kidney.

What is the danger of DVT?

Even though DVT itself is not life-threatening, the blood clots have the potential to break free and travel through your bloodstream. A pulmonary embolism (PE) happens when the traveling blood clots (emboli) become lodged in the blood vessels of your lung. Since this can be a life-threatening condition, you need a quick diagnosis and treatment.

As many as half of those who get a DVT in their legs develop symptoms of intermittent leg pain and swelling that may last months to years. These symptoms are called post-thrombotic syndrome and can happen because of damage to the valves and inner lining of your veins leading to blood “pooling” more than it should. This increases the pressure inside your veins and causes pain and swelling.

Characteristics of this condition include:

• Pooling of blood.
• Chronic leg swelling.
• Increased pressure within your veins.
• Increased pigmentation or discoloration of your skin.
• Leg ulcers known as venous stasis ulcers.

What is the difference between DVT and a superficial venous thrombosis?

A superficial venous thrombosis (also called phlebitis or superficial thrombophlebitis) is when blood clots develop in a vein close to the surface of your skin. These types of blood clots rarely travel to your lungs unless they move from the superficial system into the deep venous system first. While a physician can diagnose superficial vein clots with a physical exam, they can only diagnose DVT with an ultrasound.

How common is deep vein thrombosis?

Each year, approximately 1 to 3 in every 1,000 adults develop a DVT or pulmonary embolism in the United States, and up to 300,000 people die each year as a result of DVT/PE. It’s the third most common vascular disease, behind heart attacks and strokes. Acute DVT/PE can occur at any age, but are less common in children and adolescents and more common in those over the age of 60. More than half of all DVTs happen as a result of being in the hospital from a medical illness or following surgery. The reason why DVTs are more common after a hospital stay is because you’re lying in bed most of the time instead of moving around like you normally would.