Deep Vein Thrombosis (DVT): Symptoms, Causes, Treatment, and Prevention

Have you ever had a swollen, painful, or red leg for no clear reason? Be careful, because it could be a sign of Deep Vein Thrombosis (DVT), a serious condition that often goes unnoticed but can be life-threatening. DVT occurs when a blood clot forms in a deep vein, usually in the leg, and if left untreated, it can lead to fatal complications.

Although it is often thought of as a rare health problem, DVT is actually more common than we might think. In fact, this condition can affect anyone, especially people who have an inactive lifestyle or a certain medical history.

According to data from the World Health Organization (WHO), DVT and pulmonary embolism are the third leading cardiovascular cause of death in the world after heart attack and stroke. An estimated 10 million cases of DVT occur globally each year, with a death rate of up to 10% of all cases.

In Indonesia, although specific data on DVT are still limited, reports from the Indonesian Ministry of Health (Kemenkes) show that the prevalence of cardiovascular disease, including DVT, continues to rise along with changes in people’s lifestyles. Factors such as obesity, lack of physical activity, and smoking contribute to the increased risk of DVT.

A study published in the Journal of Thrombosis and Haemostasis also states that Asian populations, including Indonesia, have a significant risk of DVT, especially in the working-age group (30 to 50 years). This underlines the importance of awareness of DVT prevention and early detection, especially amid a modern lifestyle that tends to be inactive.

By understanding DVT more deeply, we can take the right preventive steps and reduce the risk of dangerous complications. Read on to learn what DVT is, its symptoms, causes, risk factors, diagnosis, treatment options, and how to prevent it.

01 / Blood Vessel Disease

What Is Deep Vein Thrombosis (DVT)?

Deep Vein Thrombosis (DVT) is a medical condition in which a blood clot (thrombus) forms inside a deep vein, usually in the leg. Deep veins are blood vessels located deep inside the body, unlike superficial veins, which lie close to the surface of the skin. This blood clot can block normal blood flow, causing swelling, pain, and, in severe cases, serious complications such as a pulmonary embolism.

DVT is not a condition to be taken lightly. If not treated properly, the blood clot can break loose and travel to the lungs, blocking blood flow to these vital organs. That is why understanding DVT is very important for early detection and prevention.

How Do Blood Clots Form in the Deep Veins?

Blood clots form in the deep veins when there is a disruption in blood flow, damage to the blood vessel wall, or an increased tendency of the blood to clot. These conditions are often referred to as Virchow’s triad, which includes three main factors:

• Blood Stasis: Slowed blood flow, which often happens from sitting too long (for example, during long trips or bed rest after surgery).
• Blood Vessel Damage: Injury to a vein, whether from physical trauma, surgery, or infection.
• Hypercoagulability: A condition in which the blood clots more easily, which can be caused by genetic factors, pregnancy, or certain medications.

When these three factors occur together, the risk of a blood clot forming in a deep vein becomes higher. The clot can block the vein, obstruct blood flow back to the heart, and cause symptoms such as swelling and pain.

Parts of the Body Most Often Affected by Deep Vein Thrombosis

Although DVT can occur anywhere, the legs are the part of the body most often affected, especially the calves and thighs. This is because the veins in the legs have higher pressure and a longer distance to carry blood back to the heart, especially when a person sits or stands for a long time.

Besides the legs, DVT can also occur in the arms, although these cases are rarer. DVT in the arm is usually linked to the use of a central venous catheter or activities that involve repetitive arm movements, such as in weightlifters.

According to the American Heart Association (AHA), about 90% of DVT cases occur in the legs *, while the rest occur in the arms or other parts of the body. Knowing which areas of the body are prone to DVT can help us be more alert to the symptoms that appear. (* Source: American Heart Association, Natural History of Venous Thromboembolism)

02 / Blood Vessel Disease

Symptoms of Deep Vein Thrombosis to Watch Out For

Below are the symptoms of DVT to watch out for, from common signs to symptoms that may not be obvious.

Common Symptoms

Deep Vein Thrombosis (DVT) often shows typical symptoms, especially in the area where the blood clot has formed. Here are some common symptoms to pay attention to:

• Swelling: One of the most common signs is swelling in the leg, especially in the calf or thigh. This swelling usually occurs in only one leg.
• Pain or discomfort: The pain often feels like a cramp or muscle tension, especially when standing or walking. This pain can get worse over time.
• Redness or skin discoloration: The skin in the affected area may look red or turn bluish.
• Warm skin: The area around the blood clot often feels warmer to the touch than other areas.

These symptoms can appear suddenly or develop gradually, depending on the size and location of the blood clot.

Symptoms You May Not Notice

Not all symptoms of DVT are obvious. Some symptoms may be vague or even go unnoticed, especially in the early stages. Here are symptoms that are often ignored:

• A heavy or tired feeling in the leg: Some people complain of a heavy or tired feeling in the leg, similar to fatigue after physical activity, even though they have not done anything strenuous.
• Mild swelling: The swelling may not always be clearly visible, especially if the blood clot is still small.
• Pain that comes and goes: Pain from DVT can come and go, making people think it is just ordinary muscle pain.
• Flu-like symptoms: In some cases, DVT can cause symptoms such as a low-grade fever or feeling unwell, which are often mistaken for a mild infection.

These symptoms are often ignored because they are not considered serious. In fact, early detection is very important to prevent more severe complications.

When to Seek Medical Help Right Away

DVT is a condition that requires medical treatment as soon as possible. Contact a doctor or go to a hospital right away if you experience the following symptoms:

• Sudden and severe leg swelling: If one leg swells significantly in a short time, especially if it comes with pain.
• Chest pain or shortness of breath: This can be a sign that the blood clot has traveled to the lungs and caused a pulmonary embolism, a life-threatening condition.
• Coughing up blood: A cough with blood is a serious symptom that requires emergency treatment.
• Rapid heartbeat or dizziness: These symptoms may indicate that the body is short of oxygen because of a pulmonary embolism.

According to the American Society of Hematology (ASH), about 30% of untreated DVT cases can progress to a pulmonary embolism *, which has a high death rate. Therefore, do not delay seeking medical help if you suspect symptoms of DVT. (* Source: American Society of Hematology 2021 Guidelines for Management of Venous Thromboembolism: Prevention and Treatment in Patients with Cancer)

03 / Blood Vessel Disease

Risk Factors for Deep Vein Thrombosis

In addition to the main causes explained above, there are several risk factors that can increase a person’s chance of developing DVT. These factors include:

• Inactive lifestyle: Sitting or standing for long periods without moving much, such as when working at a computer or traveling long distances.
• Obesity: Excess body weight puts more pressure on the blood vessels in the legs, slowing blood flow.
• Smoking: The chemicals in cigarettes can damage blood vessels and increase the risk of blood clots.
• Age: The risk of DVT increases with age, especially over 60.
• Family history: If a family member has had DVT or a blood clotting disorder, your risk is also higher.

According to World Thrombosis Day, about 60% of DVT cases occur in people who have at least one lifestyle risk factor, such as lack of physical activity or obesity.

Medical Conditions Associated With Deep Vein Thrombosis

Several medical conditions can also increase the risk of DVT, including:

• Cancer: Some types of cancer and their treatments (such as chemotherapy) can make the blood clot more easily.
• Heart disease: Heart failure or heart rhythm disorders (such as atrial fibrillation) can slow blood flow.
• Severe infection or inflammation: Conditions such as sepsis or autoimmune diseases can trigger blood clots to form.
• Varicose veins: Veins that are widened and do not work properly (varicose veins) can increase the risk of DVT.
• Previous DVT: If you have had DVT before, your risk of having it again is higher.

04 / Blood Vessel Disease

Serious Complications That Can Occur If DVT Is Not Treated

Deep Vein Thrombosis (DVT) is not a condition that can be ignored. If not treated properly, DVT can cause serious, life-threatening complications with long-term effects on health. In this section, we will discuss two main complications to watch out for: pulmonary embolism and post-thrombotic syndrome. By understanding these risks, you can be more alert and act quickly to prevent worse outcomes.

1. Pulmonary Embolism and Its Dangers

One of the most dangerous complications of Deep Vein Thrombosis (DVT) is pulmonary embolism. A pulmonary embolism occurs when a blood clot in a deep vein breaks loose, travels through the bloodstream, and blocks a blood vessel in the lungs. This condition can be life-threatening because it obstructs blood flow to the lungs and reduces the oxygen supply to the whole body.

Symptoms of a pulmonary embolism include:

• Sudden shortness of breath
• Sharp chest pain, especially when breathing in
• Coughing up blood
• A fast or irregular heartbeat
• Dizziness or fainting

According to the American Lung Association, pulmonary embolism is the third leading cause of cardiovascular-related death in the United States, with about 60,000 to 100,000 deaths each year. If not treated promptly, a pulmonary embolism can cause permanent lung damage or even sudden death.

2. Permanent Damage to the Blood Vessels (Post-Thrombotic Syndrome)

Besides pulmonary embolism, untreated DVT can also cause post-thrombotic syndrome, which is permanent damage to the blood vessels in the affected area. This condition occurs because the blood clot damages the valves in the veins, which help carry blood back to the heart. As a result, blood can pool in the legs, causing symptoms such as:

• Chronic swelling
• Pain or a heavy feeling in the legs
• Skin discoloration or wounds that are slow to heal (venous ulcers)

Data from the National Blood Clot Alliance show that 20 to 50% of patients with DVT can develop post-thrombotic syndrome *, especially if the blood clot is not treated quickly. This condition not only reduces quality of life but also requires long-term care to manage its symptoms. (* Source: National Blood Clot Alliance, Venous Stress Disorder: An In-Depth Guide for Patients and Health Care Providers)

05 / Blood Vessel Disease

Diagnosis and Treatment of Deep Vein Thrombosis (DVT)

Diagnosing Deep Vein Thrombosis

Deep Vein Thrombosis (DVT) is diagnosed through a series of medical tests to confirm whether there is a blood clot in a deep vein. Here are some commonly used diagnostic methods:

• Ultrasound (Doppler Ultrasound): This method is the most commonly used because it is safe, fast, and accurate. Doppler ultrasound uses sound waves to visualize blood flow and detect clots in the veins.
• D-Dimer Test: This blood test measures the level of D-dimer, a protein fragment that usually rises when there is a blood clot. However, a positive result needs to be confirmed with other tests because D-dimer levels can be high due to other conditions.
• Venography: This procedure involves injecting contrast dye into a vein, followed by an X-ray scan to see blood flow and detect clots. Although it is accurate, venography is rarely used because it is invasive.
• MRI or CT Scan: These tests are used if the blood clot is suspected to be in an area that is hard to reach, such as the abdomen or pelvis.

Doppler ultrasound is generally the first-choice test for diagnosing DVT in the legs.

Treatment Options for Deep Vein Thrombosis

Once a diagnosis of DVT is confirmed, prompt treatment is needed to prevent serious complications. Here are the commonly recommended treatment options:

• Anticoagulants (Blood Thinners): Drugs such as heparin, warfarin, or DOACs (Direct Oral Anticoagulants) are given to prevent new clots from forming and to stop existing clots from growing. This treatment usually lasts 3 to 6 months, depending on the patient’s condition.
• Thrombolytic Therapy: In severe cases of DVT with a risk of pulmonary embolism, thrombolytic drugs may be given to dissolve the blood clot quickly. However, this therapy carries a higher risk of bleeding.
• Compression Stockings: Special stockings are used to reduce swelling and prevent complications such as post-thrombotic syndrome.

Anticoagulants given at the right time can help reduce the risk of pulmonary embolism.

Long-Term Care to Prevent Recurrence

After the acute phase of DVT has been treated, long-term care is needed to prevent it from coming back. Steps that can be taken include:

1. Continued anticoagulant therapy: Some patients may need to take blood thinners long term, especially if they have risk factors such as recurrent DVT or a genetic condition that increases the risk of blood clots.
2. Lifestyle changes: Maintaining an ideal body weight, quitting smoking, and exercising regularly can help reduce the risk of DVT.
3. Regular monitoring: Patients are advised to have regular checkups with their doctor to monitor the condition of their blood vessels and adjust treatment if needed.

Data from the Journal of Thrombosis and Haemostasis show that about 30% of patients with DVT are at risk of recurrence within 10 years if they do not receive proper preventive care.

With an accurate diagnosis and proper treatment, DVT can be managed well, reducing the risk of complications and improving the patient’s quality of life.

06 / Blood Vessel Disease

Effective Steps to Prevent DVT

Prevention is far better than cure. With simple steps and lifestyle changes, you can significantly reduce your risk of DVT. Below are healthy lifestyle tips, the importance of avoiding sitting for too long, and the use of compression stockings for high-risk individuals.

Healthy Lifestyle Tips to Reduce the Risk of Deep Vein Thrombosis

Adopting a healthy lifestyle is the main step in reducing the risk of Deep Vein Thrombosis (DVT). Here are some tips you can follow:

1. Exercise regularly: Physical activity such as walking, cycling, or swimming can improve blood circulation and prevent blood stasis. Try to exercise for at least 30 minutes a day, 5 times a week.
2. Maintain an ideal body weight: Excess body weight puts more pressure on the blood vessels in the legs, increasing the risk of DVT. Eat a healthy, balanced diet to maintain your weight.
3. Stay well hydrated: Drinking water regularly helps keep the thickness of your blood normal, reducing the risk of clotting.
4. Quit smoking: Smoking damages blood vessels and increases the risk of clotting. Quitting smoking is an important step to protect your cardiovascular health.

An active lifestyle can help reduce the risk of DVT, especially in people with risk factors such as obesity or a family history.

The Importance of Avoiding Sitting Too Long and Stretching During Long Trips

Sitting for too long, whether at work or while traveling, can slow blood flow in the legs and increase the risk of DVT. Here is how to prevent it:

1. Stretch every 1 to 2 hours: If you sit for a long time, stand up and do simple stretches such as moving your legs or walking for 5 to 10 minutes.
2. Move your legs while sitting: Rotate your ankles or lift your heels alternately to keep blood flowing smoothly.
3. Avoid crossing your legs: Crossing your legs can restrict blood flow. Try to keep your legs straight.

Using Compression Stockings for High-Risk Individuals

Compression stockings are specially designed to help improve blood circulation in the legs by applying even pressure. They are very useful for high-risk individuals, such as:

• Patients after surgery
• Pregnant women
• People with a history of DVT
• People who have to sit or stand for long periods

Compression stockings work by:

1. Preventing swelling in the legs
2. Reducing heaviness or pain
3. Lowering the risk of blood clots forming

Wearing compression stockings can help reduce the risk of DVT in patients who undergo major surgery or have limited mobility.

By taking these preventive steps, you can significantly reduce your risk of DVT and keep your blood vessels healthy in the long term.

07 / Blood Vessel Disease

Conclusion

Deep Vein Thrombosis (DVT) is a serious condition that occurs when a blood clot forms in a deep vein, especially in the leg. Symptoms include swelling, pain, and redness in the affected area. If left untreated, DVT can lead to dangerous complications such as pulmonary embolism and post-thrombotic syndrome. Risk factors for DVT include an inactive lifestyle, obesity, smoking, and certain medical conditions such as cancer or heart disease. DVT is diagnosed with Doppler ultrasound, a D-dimer test, or venography, while treatment involves anticoagulants and thrombolytic therapy.

Keeping your cardiovascular system healthy is an important step in preventing DVT and other heart diseases. Start by adopting a healthy lifestyle, such as exercising regularly, maintaining an ideal body weight, and avoiding cigarettes. In addition, watch for symptoms of DVT and consult a doctor promptly if you suspect any unusual signs. Remember, early detection and quick treatment can save lives.

Do not wait until it is too late! Start taking preventive steps today to protect yourself and your family from the risk of cardiovascular disease. If you have risk factors for DVT, such as a family history or limited mobility, consider wearing compression stockings and talking to your doctor about the right preventive steps.

Remember that the information in this article is educational and is not a substitute for professional medical advice. If you have symptoms or risk factors of deep vein thrombosis or other cardiovascular (heart and blood vessel) diseases, consult a specialist promptly or visit Heartology Cardiovascular Hospital for proper evaluation and care.

At Heartology Cardiovascular Hospital, cardiologists can explain your condition and the procedures, risks, and benefits of testing, as well as answer your questions about heart and blood vessel health.