Heart Attack (Myocardial Infarction)

A heart attack is a life-threatening medical emergency that occurs when blood flow to a section of the heart muscle is severely reduced or completely blocked. Without a steady supply of oxygen-rich blood, the affected heart tissue begins to die within minutes. The faster blood flow is restored, the more heart muscle can be saved — which is why immediate medical attention is critical.

Heart attacks are among the leading causes of death worldwide, yet many are preventable with the right knowledge and lifestyle choices. In this guide, we will explore what happens during a cardiac event, how to recognize it, and when to seek help.

Understanding Myocardial Infarction (MI)

The medical term for a heart attack is myocardial infarction (MI). "Myocardial" refers to the heart muscle, and "infarction" means tissue death due to lack of oxygen. Myocardial infarction symptoms can range from sudden and severe to subtle and easily mistaken for indigestion or fatigue — particularly in women and older adults. There are two main types of myocardial infarction:

• STEMI (ST-elevation MI): a complete blockage of a coronary artery and is considered a massive heart attack
• NSTEMI (non-ST-elevation MI): the artery is only partially blocked.

Both require emergency medical care, though STEMI is generally more immediately life-threatening.

How Blood Clots Block the Heart

Most heart attacks are caused by coronary artery disease (CAD) — a condition where fatty deposits called plaques build up inside the coronary arteries over time. This process, known as atherosclerosis, narrows the arteries and reduces blood flow to the heart.

When a plaque ruptures, the body responds by forming a blood clot at the site. If the clot becomes large enough to completely block the artery, the downstream heart muscle is cut off from oxygen and begins to die. This is the defining event of a heart attack. It is important to note that a heart attack is distinct from cardiac arrest, which is when the heart stops beating altogether — though a heart attack can trigger cardiac arrest.

Recognizing Heart Attack Symptoms

Knowing the signs of a heart attack can save your life or the life of someone around you. Heart attack symptoms can appear suddenly or build gradually over hours or even days. The most common signs include:

• Chest pain or discomfort — Often described as pressure, squeezing, tightness, or a crushing sensation in the center or left side of the chest. This is the hallmark symptom of heart attack.
• Pain radiating to other areas — Discomfort may spread to the left arm, both arms, the jaw, neck, back, or stomach.
• Shortness of breath — This may occur with or without chest pain and can appear during rest or mild activity.
• Nausea or vomiting — Particularly common in women.
• Cold sweats — Breaking into a sudden, unexplained sweat is a warning sign that should not be ignored.
• Lightheadedness or dizziness — Feeling faint or suddenly unsteady.
• Unusual fatigue — Extreme tiredness, especially in the days leading up to a heart attack, is frequently reported — particularly by women.

Not all heart attacks present with dramatic chest pain. Some people experience only mild discomfort, while others — especially those with diabetes — may have a "silent" heart attack with few or no symptoms. Angina, a recurring chest pain caused by reduced blood flow, can sometimes resemble heart attack symptoms but typically subsides with rest or medication. A true heart attack will not.

Immediate Actions: What To Do During a Heart Attack

If you or someone nearby shows signs of a heart attack, every second counts.

1. Call emergency services immediately. Do not drive yourself to the hospital. Emergency responders can begin treatment en route.
2. Chew an aspirin (325 mg or a low-dose 81 mg) if available and not allergic — this helps prevent further blood clotting.
3. Stay calm and rest. Sit or lie down in a comfortable position to reduce strain on the heart.
4. Loosen tight clothing to make breathing easier.
5. If the person becomes unconscious and stops breathing, begin CPR if you are trained to do so. Use an automated external defibrillator (AED) if available.

Do not wait to see if symptoms improve on their own. Time lost is heart muscle lost — and prompt action dramatically improves survival and recovery outcomes.

Heart Attack Causes and Risk Factors

Understanding heart attack causes can help guide prevention. The primary cause is coronary artery disease, but several factors accelerate its development.

Non-modifiable risk factors (those you cannot change):

• Age — risk increases significantly for men over 45 and women over 55
• Family history of heart disease or early heart attack
• Genetic conditions affecting cholesterol metabolism

Modifiable heart attack risk factors (those you can address):

• High blood pressure (hypertension) — damages artery walls over time
• High LDL cholesterol — contributes to plaque buildup
• Smoking — damages blood vessels and accelerates atherosclerosis
• Type 2 diabetes — raises risk substantially due to effects on blood vessels and nerves
• Obesity — especially excess abdominal fat
• Physical inactivity — a sedentary lifestyle weakens cardiovascular health
• Unhealthy diet — high in saturated fats, trans fats, salt, and processed foods
• Chronic stress — elevates blood pressure and promotes inflammation
• Excessive alcohol consumption

Certain conditions such as metabolic syndrome, sleep apnea, inflammatory diseases like rheumatoid arthritis, and a history of preeclampsia in women are also associated with elevated cardiovascular risk.

Diagnosing a Heart Attack

When a patient arrives at the emergency room with suspected heart attack symptoms, doctors move quickly to confirm the diagnosis and assess the extent of damage. Several diagnostic tools are used in combination.

Electrocardiogram (ECG/EKG): What It Reveals

An electrocardiogram (ECG or EKG) is typically the first test performed. It records the electrical activity of the heart and can reveal abnormal patterns that indicate a blocked artery or damaged heart tissue. In a STEMI, the ECG shows a characteristic "ST elevation" — a clear signal that a major coronary artery is completely occluded. An ECG can provide results within minutes, making it an essential first step in emergency care.

Blood Tests to Confirm Damage

When heart muscle cells die, they release proteins into the bloodstream. The most important of these is troponin — a highly sensitive marker of heart muscle injury. Elevated troponin levels confirm that a myocardial infarction has occurred and help doctors gauge the severity of the damage.

Other blood markers including CK-MB (creatine kinase-MB) and myoglobin may also be measured. Blood tests are typically repeated at intervals to track how levels change over time, which helps determine whether the event is ongoing or resolving.

Additional diagnostic tools may include echocardiography (ultrasound of the heart), chest X-ray, and coronary angiography — an imaging procedure that directly visualizes the coronary arteries and identifies the exact location of a blockage.

Heart Attack Treatment Options

Heart attack treatment aims to restore blood flow as quickly as possible, limit damage to the heart muscle, and prevent future events. Treatment is tailored to the type and severity of the heart attack.

Medications Commonly Used

• Thrombolytics (clot-busting drugs) — dissolve the blood clot blocking the artery, especially useful when emergency intervention is not immediately available
• Antiplatelet agents (e.g., aspirin, clopidogrel) — prevent further clot formation
• Anticoagulants (blood thinners) — reduce clotting risk
• Beta-blockers — reduce heart rate and blood pressure, protecting the heart
• ACE inhibitors — help the heart pump more effectively and prevent long-term remodeling
• Nitrates — relieve chest pain by widening blood vessels
• Statins — lower cholesterol and stabilize existing plaques

Interventional Procedures

• Percutaneous Coronary Intervention (PCI / angioplasty): The preferred treatment for STEMI when available. A thin catheter is guided through the arteries to the blockage site, where a balloon is inflated to open the artery. A stent is usually placed to keep the artery open.
• Coronary Artery Bypass Grafting (CABG): In cases with multiple or complex blockages, open-heart surgery may be required. Healthy blood vessels from elsewhere in the body are used to create new routes around blocked arteries.

The goal in treating heart attacks is always to minimize the time between symptom onset and treatment — often referred to as "door-to-balloon" time in hospital settings.

Recovery and Rehabilitation After a Heart Attack

Recovering from a heart attack is a gradual process that involves both physical healing and lifestyle adjustment. Most patients spend several days in the hospital for monitoring, medication management, and initial recovery.

Cardiac rehabilitation is a structured, medically supervised program that plays a vital role in long-term recovery. It typically includes:

• Monitored exercise training to safely rebuild cardiovascular fitness
• Education on heart-healthy eating, medication adherence, and stress management
• Psychological support to address anxiety and depression, which are common after a cardiac event

Beyond formal rehabilitation, recovering from a heart attack requires significant lifestyle changes:

• Quitting smoking permanently
• Following a heart-healthy diet low in saturated fats and sodium
• Maintaining a healthy weight
• Managing blood pressure, cholesterol, and blood sugar levels
• Taking prescribed medications consistently
• Gradually increasing physical activity under medical guidance

Most patients can return to normal daily activities within a few weeks, though returning to work or strenuous exercise will depend on the individual's condition. Regular follow-up appointments with a cardiologist are essential during this period.

Potential Complications of a Heart Attack

Even after successful treatment, complications of a heart attack can arise, particularly if a significant amount of heart muscle has been damaged.

• Heart failure — the heart becomes too weak to pump blood efficiently
• Arrhythmias — irregular heart rhythms, which can be life-threatening
• Cardiogenic shock — a severe drop in cardiac output that leads to organ failure
• Pericarditis — inflammation of the sac surrounding the heart
• Ventricular aneurysm — a bulge in the weakened wall of the heart
• Recurrent heart attack — individuals who have had one heart attack are at elevated risk for another

Early and comprehensive medical care significantly reduces the likelihood and severity of these complications. Close monitoring during recovery helps detect any emerging issues before they become critical.

Preventing Heart Attacks

Heart attack prevention is possible for the majority of people. Since most heart attacks stem from modifiable risk factors, proactive steps can dramatically reduce your risk. Key prevention strategies include:

• Regular check-ups and screenings — Know your blood pressure, cholesterol, and blood sugar levels. Early detection of abnormalities allows for timely intervention.
• Adopt a heart-healthy diet — Emphasize vegetables, fruits, whole grains, legumes, lean proteins, and healthy fats (such as olive oil and omega-3 fatty acids). Minimize processed foods, red meat, and excess salt.
• Exercise regularly — Aim for at least 150 minutes of moderate aerobic activity per week, such as brisk walking, cycling, or swimming.
• Stop smoking — Quitting smoking is one of the single most impactful steps you can take for heart health, regardless of how long you have smoked.
• Manage chronic conditions — Work closely with your doctor to keep blood pressure, cholesterol, and diabetes under control.
• Reduce and manage stress — Incorporate relaxation techniques such as meditation, deep breathing, or yoga into your daily routine.
• Limit alcohol — If you drink, do so in moderation.
• Maintain a healthy weight — Even modest weight loss can meaningfully improve cardiovascular risk.

If you have a family history of coronary artery disease or have experienced angina or other warning signs, speak with a cardiologist about your individual risk profile. Preventive medications such as statins or low-dose aspirin may be appropriate for some patients.

At Medical Park, our cardiology and cardiovascular surgery teams provide comprehensive care for all stages of heart disease from risk assessment and prevention to emergency treatment and long-term rehabilitation. If you have concerns about your heart health, do not hesitate to consult one of our specialists.