What is pulmonary embolism?
Pulmonary embolism is the sudden blockage of a major blood vessel (artery) in the lung, usually by a blood clot. In most cases, the clots are small and are not deadly, but they can damage the lung. But if the clot is large and stops blood flow to the lung, it can be deadly. Quick treatment could save your life or reduce the risk of future problems.
What are the symptoms?
The most common symptoms are:
Pulmonary embolism can also cause more general symptoms. For example, you may feel anxious or on edge, sweat a lot, feel lightheaded or faint, or have a fast heart rate or palpitations.
If you have symptoms like these, you need to see a doctor right away, especially if they are sudden and severe.
What causes pulmonary embolism?
In most cases, pulmonary embolism is caused by a blood clot in the leg that breaks loose and travels to the lungs. A blood clot in a vein close to the skin is not likely to cause problems. But having blood clots in deep veins (deep vein thrombosis) can lead to pulmonary embolism. More than 300,000 people each year have deep vein thrombosis or a pulmonary embolism.1
Other things can block an artery, such as tumors, air bubbles, amniotic fluid, or fat that is released into the blood vessels when a bone is broken. But these are rare.
What increases your risk of pulmonary embolism?
Anything that makes you more likely to form blood clots increases your risk of pulmonary embolism. Some people are born with blood that clots too quickly. Other things that can increase your risk include:
You are also at higher risk for blood clots if you are an older adult (especially older than 70) or extremely overweight (obese).
How is pulmonary embolism diagnosed?
It may be hard to diagnose pulmonary embolism, because the symptoms are like those of many other problems, such as a heart attack, a panic attack, or pneumonia. A doctor will start by doing a physical exam and asking questions about your past health and your symptoms. This helps the doctor decide if you are at high risk for pulmonary embolism.
Based on your risk, you might have tests to look for blood clots or rule out other causes of your symptoms. Common tests include blood tests, ultrasound, spiral CT scan, electrocardiogram (EKG, ECG), and MRI.
How is it treated?
Doctors usually treat pulmonary embolism with medicines called anticoagulants. They are often called blood thinners, but they don't really thin the blood. They help prevent new clots and keep existing clots from growing.
At first, the doctor may give you a shot of heparin, a blood thinner that works quickly. Then you may take warfarin (such as Coumadin), a blood thinner that you take as a pill. Most people take warfarin for a few months. People at high risk for blood clots may need it for the rest of their lives.
If symptoms are severe and life-threatening, "clot-busting" drugs called thrombolytics may be used. These medicines can dissolve clots quickly, but they increase the risk of serious bleeding. Another option is surgery to remove the clot (embolectomy).
Some people can't take blood thinners, or they form clots in spite of taking the medicine. To prevent future problems, they may have a filter put into the large vein (vena cava) that carries blood from the lower body to the heart. A vena cava filter helps keep blood clots from reaching the lungs.
If you have had pulmonary embolism once, you are more likely to have it again. Blood thinners can help reduce your risk, but they increase your risk of bleeding. If your doctor prescribes blood thinners, be sure you understand how to take your medicine safely, and see your doctor for regular blood tests.
You can reduce your risk of pulmonary embolism by doing things that help prevent blood clots in your legs.
Frequently Asked Questions
eMedicineHealth Medical Reference from Healthwise
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