Arterial Thrombosis

Overview

Arterial thrombosis happens when a blood clot forms inside an artery. Arteries are blood vessels that carry oxygen-rich blood from your heart to your organs and tissues. If a clot blocks an artery, the part of the body fed by that artery can be starved of blood and oxygen. This can damage the heart, brain, bowel, arm, or leg. It is different from a clot in a vein, which is called venous thrombosis.

Arterial thrombosis is a common cause of heart attacks and strokes. Clots in other arteries, such as the bowel or limbs, are less common but still serious.

It can affect anyone, but it is more likely in people with fatty build-up in their arteries, heart rhythm problems such as atrial fibrillation (an irregular heartbeat), diabetes, high blood pressure, high cholesterol, or a smoking habit. It becomes more common with age.

Symptoms

Common symptoms

• Chest pain, pressure, tightness, or heaviness, sometimes spreading to the arm, jaw, neck, or back
• Sudden weakness, numbness, or drooping on one side of the face or body
• Trouble speaking or understanding speech
• Sudden loss of vision or blurred vision in one eye
• A cold, pale, painful arm or leg, sometimes with loss of feeling or movement
• Severe abdominal pain, often with vomiting or diarrhea, if a bowel artery is blocked
• Shortness of breath, sweating, feeling faint, or a sense of doom

Symptoms in children

• Arterial thrombosis is rare in children. When it happens, it is often linked to a heart problem present from birth, a long-term tube (catheter) in a blood vessel, severe infection, dehydration, or an inherited clotting disorder.
• Children may show a cold, pale, painful arm or leg, or sudden weakness. Seek urgent medical help for these signs.

Symptoms in older adults

• Older adults are more likely to have arterial thrombosis because fatty build-up and heart rhythm problems are more common.
• Symptoms may be less typical, such as confusion, tiredness, or shortness of breath without chest pain. Do not dismiss sudden changes.

Causes

Main causes

• A blood clot can form when an artery is narrowed by fatty build-up (atherosclerosis) and the surface of the fatty plaque breaks open.
• A clot can also travel from the heart to an artery in the brain or body, especially in people with atrial fibrillation (an irregular heartbeat).
• Less often, clots form in arteries after injury, surgery, infection, or with certain clotting disorders.

Risk factors

• Smoking or using tobacco
• High blood pressure
• High cholesterol
• Diabetes
• Obesity and lack of physical activity
• An unhealthy diet high in salt, sugar, and processed foods
• Family history of heart attack or stroke
• Atrial fibrillation or other heart rhythm problems
• Previous heart attack, stroke, or peripheral artery disease (narrowed arteries in the limbs)
• Some inflammatory conditions and inherited clotting disorders
• Getting older

When to see a doctor

See a doctor urgently if:

• New pain, coldness, or color change in an arm or leg
• Chest discomfort that is new, comes and goes, or feels different from usual
• Sudden severe headache or vision changes
• Shortness of breath that is new or worsening
• If you have risk factors and feel generally unwell with no clear cause

Book a routine appointment if:

• Discussion about risk factors such as high blood pressure, cholesterol, diabetes, or smoking
• Follow-up after a clot or a procedure to open an artery
• Questions about medicines that reduce clotting
• Planning travel or surgery if you have had a clot

Diagnosis

A doctor will ask about your symptoms, past health, and medicines, and examine you. They will check blood flow, pulse, and signs of heart or brain problems. Tests depend on where the clot may be.

Tests that may be done

• Blood tests
• ECG (a heart tracing test)
• Ultrasound or Doppler scan to check blood flow
• CT angiography or MRI angiography (imaging tests that use dye or magnets to show arteries)
• Echocardiogram (an ultrasound of the heart)
• Ankle-brachial index (a blood pressure test comparing arm and ankle)

What to expect at your appointment

Some tests are quick and painless. Others use a small tube or dye and may feel cold or warm for a moment. Your team will explain each test. Do not delay emergency care while waiting for tests.

Treatment

Treatment aims to restore blood flow, stop the clot from growing, and prevent new clots. It depends on where the clot is and how serious it is. Emergency treatment may include medicines that dissolve clots or procedures to open the artery. Long-term care focuses on the cause and risk factors.

Self-care at home

• Take medicines exactly as prescribed
• Do not stop a medicine that reduces clotting without talking to your healthcare provider
• Keep follow-up appointments
• Know the warning signs and when to call emergency services
• Quit smoking and avoid secondhand smoke
• Stay active as advised by your healthcare team

Medical treatments

Doctors may use medicines that make the blood less likely to clot, medicines that dissolve clots in an emergency, and procedures to open or bypass a blocked artery. They will also treat the underlying cause, such as heart rhythm problems, high blood pressure, diabetes, or high cholesterol. Treatment is tailored to you.

When is surgery considered?

Some people need a procedure to remove a clot, open a narrowed artery with a small balloon and stent, or bypass the blocked area with a healthy blood vessel. A specialist decides this based on where the clot is and how much tissue is at risk.

Living with this condition

Life after arterial thrombosis often includes regular check-ups, medicines, and heart-healthy habits. Many people return to normal activities, but tiredness or worry can last a while. Follow your care plan and ask about rehabilitation if it is offered.

Lifestyle tips

• Quit smoking and get support if you need it
• Eat a balanced diet
• Move regularly and build up slowly
• Limit alcohol
• Manage stress and get enough sleep
• Take medicines as prescribed
• Check blood pressure, blood sugar, and cholesterol as advised

Diet and exercise

Choose vegetables, fruits, whole grains, beans, nuts, fish, and lean protein. Limit salt, sugary drinks, and heavily processed foods. Aim for regular movement, such as walking, as cleared by your doctor. Start slowly and build up.

Mental health and emotional wellbeing

It is normal to feel anxious, low, or frightened after a clot. These feelings can affect sleep and recovery. Talk to your healthcare team; counselling and support groups can help. If you feel hopeless or have thoughts of harming yourself, contact your local crisis service or emergency services right away.

Prevention

Many cases can be prevented or made less likely by managing risk factors. Not all clots can be prevented, but healthy habits and the right medical care lower your risk.

Vaccines

Stay up to date with recommended vaccinations, especially if you have heart or lung problems. Ask your healthcare provider which vaccines are right for you.

Screening programmes

There is no routine screening test for arterial thrombosis itself. Your doctor may check blood pressure, cholesterol, and blood sugar, and look for heart rhythm problems such as atrial fibrillation. These checks help find and treat risk factors early.

Complications

If left untreated

• Tissue damage in the heart, brain, bowel, arm, or leg
• Heart attack or stroke
• Loss of limb function or amputation in severe limb clots
• Long-term disability or death in serious cases

Long-term outlook

The outlook is often good when a clot is treated quickly and the cause is managed. Many people recover well with follow-up care and healthy habits. Your healthcare team can tell you what to expect for your situation.

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