Heart Attack: Causes, Warning Signs, and Treatment

Most people associate a heart attack with sudden chest pain, as it is one of its most common signs. A heart attack can, however, also cause other symptoms that are easier to overlook or mistake for something less serious. Recognising these signs and seeking emergency medical care can help limit damage to the heart and reduce the risk of serious complications. This article explores the causes of a heart attack, the warning signs to look out for and the treatment options available.

What is a Heart Attack?

A heart attack, medically known as a myocardial infarction, occurs when blood flow to part of the heart muscle is severely reduced or blocked. The heart needs a continuous supply of oxygen-rich blood to function. When this supply is interrupted, the affected heart muscle begins to sustain damage.

Most heart attacks occur because of coronary artery disease, a condition in which fatty deposits called plaques build up inside the coronary arteries. If a plaque ruptures, a blood clot can form and block blood flow to the heart muscle. Without prompt treatment, the affected tissue may suffer permanent damage.

A heart attack is a medical emergency that requires immediate attention. The extent of heart muscle damage depends partly on how long blood flow remains restricted and how quickly treatment begins.

What Causes a Heart Attack?

A heart attack most commonly occurs when blood flow through one of the coronary arteries becomes blocked. However, other conditions can also restrict the blood supply to the heart. The main causes include:

• Coronary Artery Disease: Fatty deposits gradually accumulate inside the coronary arteries, narrowing the space available for blood to flow. This can restrict the supply of oxygen to the heart muscle.

• Plaque Rupture: The outer layer of a plaque can break, triggering the formation of a blood clot. If the clot blocks a coronary artery, it can cause a heart attack.

• Coronary Artery Spasm: A sudden tightening of a coronary artery can temporarily or severely restrict blood flow to the heart. In some cases, this can trigger a heart attack.

• Spontaneous Coronary Artery Dissection (SCAD): This uncommon condition occurs when a tear develops in the wall of a coronary artery, disrupting blood flow. It can cause a heart attack even in people without typical cardiovascular risk factors.

• Reduced Oxygen Supply: In some circumstances, a severe imbalance between the oxygen supplied to the heart and its needs can cause a heart attack, particularly when another illness or condition places significant strain on the body.

Who is at Risk of a Heart Attack?

A heart attack can affect people of different ages, although the likelihood generally increases with age. Certain medical conditions, lifestyle habits and inherited factors can increase the risk by contributing to coronary artery disease or placing additional strain on the cardiovascular system.

Some important risk factors include:

• High Blood Pressure: Persistently elevated blood pressure can damage artery walls and contribute to the development of coronary artery disease.

• High Cholesterol: High levels of LDL cholesterol can promote the formation of fatty deposits inside the arteries, increasing the risk of blockages.

• Diabetes: Elevated blood glucose levels can damage blood vessels and increase the likelihood of developing cardiovascular disease.

• Smoking: Tobacco use damages blood vessels, promotes plaque formation and increases the likelihood of blood clot formation.

• Unhealthy Lifestyle: Physical inactivity, a diet high in saturated and trans fats, and excess body weight can contribute to cardiovascular risk.

• Age and Family History: The risk generally increases with age. A family history of premature cardiovascular disease can also indicate a higher inherited risk.

• Existing Heart Disease: People with established coronary artery disease or a previous heart attack have a higher risk of further cardiac events.

Some risk factors can be modified through lifestyle changes and medical treatment, while others, such as age and family history, cannot be changed. 

What are the Warning Signs of a Heart Attack?

Heart attack symptoms can vary in intensity and presentation. Some people experience sudden, severe chest pain, while others develop discomfort or breathlessness that initially seems mild. Symptoms may also begin gradually or come and go.

Heart attack warning signs can include:

• Chest Discomfort: Pressure, tightness, squeezing, heaviness or pain in the centre of the chest. The discomfort may last several minutes or disappear and return.

• Pain in Other Areas: Discomfort may spread to one or both arms, the shoulders, back, neck, jaw or upper abdomen.

• Shortness of Breath: Difficulty breathing may occur with chest discomfort or on its own.

• Cold Sweats: Sudden sweating without an obvious cause can accompany a heart attack.

• Nausea or Indigestion: Some people experience nausea, vomiting or discomfort that resembles indigestion.

• Dizziness or Light-headedness: A feeling of faintness or sudden weakness may occur during a cardiac event.

• Unusual Fatigue: Some people, particularly women, may experience unexplained tiredness or weakness, sometimes before the heart attack itself.

Chest pain remains a common heart attack symptom in both men and women. However, symptoms do not always follow the same pattern, and the absence of severe chest pain does not rule out a heart attack.

A heart attack can also occur without obvious symptoms, which is sometimes described as a silent heart attack. It may only be identified later through an ECG or other medical investigations.

How is a Heart Attack Treated?

Heart attack treatment aims to restore blood flow to the heart muscle, limit tissue damage and prevent complications. 

Treatment may involve the following:

Emergency Assessment

Doctors assess symptoms, vital signs and medical history while arranging urgent investigations. An electrocardiogram (ECG) records the heart's electrical activity, while blood tests, including cardiac troponin, help identify heart muscle injury.

Medications

Depending on the clinical situation, treatment may include antiplatelet medicines to reduce clot formation, anticoagulants to limit clot growth and other medicines to manage pain, blood pressure or the heart's workload.

Angioplasty and Stenting

Percutaneous coronary intervention (PCI) may be performed to restore blood flow through a blocked coronary artery. A catheter is used to reach the affected artery, and a balloon may be inflated to open the blockage. A stent is often placed to help keep the artery open.

Coronary Artery Bypass Surgery

In selected cases, coronary artery bypass grafting (CABG) may be recommended to create an alternative route for blood to reach the heart muscle.

What Should You Do If Someone Has a Heart Attack?

A suspected heart attack requires urgent medical assistance. Taking the right steps while waiting for emergency services can help the person receive timely care.

The immediate steps include:

• Call Emergency Services: Contact emergency services immediately. In India, the emergency number is 112. Do not wait to see whether the symptoms improve.

• Help the Person Rest: Ask the person to stop any physical activity and rest in a comfortable position while waiting for medical assistance.

• Follow Medical Instructions: Follow the emergency dispatcher's guidance. Aspirin may be recommended in some circumstances, but it is not suitable for everyone. Medical advice should be followed, particularly if there is an allergy or a risk of bleeding.

• Monitor Their Condition: Stay with the person and watch for changes in consciousness or breathing. Do not leave them alone while waiting for help.

• Start CPR if Necessary: If the person becomes unresponsive and is not breathing normally, begin cardiopulmonary resuscitation (CPR) and use an automated external defibrillator (AED), if available. Follow the emergency dispatcher's instructions.

Consult Today

A heart attack can be life-threatening, and its symptoms are not always as obvious as many people expect. Since timely medical attention can make a significant difference to the outcome, it is important to take unusual chest discomfort, breathlessness or other possible warning signs seriously. If there are concerns about heart health or symptoms that need evaluation, consult a cardiologist for a thorough assessment and appropriate medical guidance.