Chapter 7: Emergency Treatment of a Heart Attack

A heart attack is one of the most time-sensitive medical emergencies. The moment a coronary artery becomes blocked, the heart muscle begins to lose its oxygen supply. Within minutes, heart muscle cells become injured, and if blood flow is not restored quickly, irreversible damage occurs. Every minute of delay increases the amount of permanent muscle loss, reduces the heart’s pumping ability, and raises the risk of death.

Modern medical advances have dramatically improved the survival rate of heart attack patients. Today, many individuals who receive rapid treatment recover fully and return to active lives. However, the success of treatment depends largely on how quickly the patient reaches medical care and how rapidly the blocked artery is reopened.

This chapter explains the emergency treatment of myocardial infarction, beginning with first aid at home and continuing through hospital-based therapies, emergency angioplasty, medications, and coronary artery bypass surgery.

The First Hour: The Golden Hour

Cardiologists often refer to the first hour after the onset of heart attack symptoms as the Golden Hour. During this period, rapid restoration of blood flow can save a large amount of heart muscle.

Studies have shown that patients treated within the first hour have significantly lower rates of heart failure, arrhythmias, and death than those treated later.

Unfortunately, many people lose valuable time because they ignore symptoms, mistake them for indigestion, or hope they will disappear.

Every minute counts.

Recognizing the Emergency

Anyone experiencing the following symptoms should assume a heart attack until proven otherwise:

• Chest pressure or tightness lasting more than 10–15 minutes
• Pain spreading to the arm, shoulder, neck, jaw, or back
• Shortness of breath
• Cold sweating
• Nausea or vomiting
• Severe weakness
• Dizziness or fainting
• Sudden unexplained fatigue

Do not wait for symptoms to improve on their own.

What to Do Immediately

If a heart attack is suspected:

1. Call emergency medical services immediately.
2. Stop all physical activity.
3. Sit or lie down comfortably.
4. Stay calm and avoid walking unnecessarily.
5. Loosen tight clothing around the neck or chest.
6. Unlock the front door if possible so emergency personnel can enter quickly.
7. Inform family members or nearby people.

Driving yourself to the hospital is discouraged because dangerous heart rhythm disturbances may develop unexpectedly.

Aspirin: The First Life-Saving Medication

One of the first treatments for a suspected heart attack is aspirin.

Platelets play a major role in forming the blood clot that blocks the coronary artery. Aspirin reduces platelet activity, slowing further clot formation.

If the patient is not allergic to aspirin and has no medical reason to avoid it, emergency personnel or healthcare professionals often recommend chewing a standard aspirin tablet rather than swallowing it whole. Chewing allows the medication to be absorbed more rapidly.

Early aspirin administration has been shown to reduce mortality significantly.

However, aspirin should not be taken by individuals with known severe allergy, active gastrointestinal bleeding, or other contraindications unless directed by a healthcare professional.

Nitroglycerin

Nitroglycerin is commonly prescribed for patients with coronary artery disease.

It works by relaxing blood vessels, reducing the heart’s workload, and improving blood flow through the coronary arteries.

Nitroglycerin may relieve chest pain caused by reduced blood flow, but it does not dissolve blood clots or cure a heart attack.

Patients who already have a prescription may take nitroglycerin exactly as instructed by their physician while awaiting emergency medical services.

Nitroglycerin should never be taken together with medications for erectile dysfunction, such as sildenafil, tadalafil, or vardenafil, because the combination can cause dangerously low blood pressure.

Oxygen Therapy

For many years, oxygen was routinely given to every heart attack patient.

Modern research has shown that oxygen therapy is most beneficial for patients who have:

• Low oxygen saturation
• Severe shortness of breath
• Heart failure
• Cardiogenic shock

Patients with normal oxygen levels generally do not benefit from routine oxygen administration.

Emergency Medical Services

Emergency medical teams begin treatment before the patient reaches the hospital.

Ambulance personnel typically:

• Monitor heart rhythm continuously.
• Record an ECG.
• Measure blood pressure and oxygen saturation.
• Start intravenous access.
• Administer aspirin when appropriate.
• Provide oxygen if needed.
• Give medications for pain and blood clot prevention.
• Alert the receiving hospital if a STEMI is identified.

This early treatment shortens the time to definitive therapy.

Hospital Emergency Evaluation

Upon arrival at the emergency department, treatment continues immediately.

The medical team rapidly performs:

• Electrocardiogram (ECG)
• Blood tests including troponin
• Physical examination
• Continuous cardiac monitoring
• Chest X-ray if necessary

If the ECG shows ST-segment elevation, the patient is usually transferred immediately to the cardiac catheterization laboratory.

Pain Management

Severe chest pain increases stress hormones, raising heart rate and blood pressure.

Pain relief helps reduce anxiety and decreases the heart’s oxygen demand.

Medications may include:

• Nitroglycerin
• Morphine (selected patients)
• Fentanyl (in some cases)

Modern practice uses opioid medications more selectively than in the past because they may interfere with the absorption of certain antiplatelet drugs.

Antiplatelet Medications

Platelets are responsible for forming the clot that blocks the coronary artery.

Several medications prevent platelets from sticking together.

These include:

• Aspirin
• Clopidogrel
• Ticagrelor
• Prasugrel

Most patients receive aspirin together with a second antiplatelet medication, a strategy known as dual antiplatelet therapy (DAPT).

DAPT significantly reduces the risk of recurrent clot formation after stent placement.

Anticoagulant Medications

Anticoagulants reduce the formation of fibrin, the protein that stabilizes blood clots.

Common anticoagulants include:

• Unfractionated heparin
• Low-molecular-weight heparin (enoxaparin)
• Bivalirudin (selected PCI patients)

These medications prevent existing clots from enlarging and reduce the formation of new clots during treatment.

Primary Percutaneous Coronary Intervention (Primary PCI)

Primary PCI is the preferred treatment for ST-elevation myocardial infarction.

It is commonly known as emergency angioplasty.

During the procedure:

1. A catheter is inserted into an artery in the wrist or groin.
2. The catheter is guided to the blocked coronary artery.
3. Contrast dye identifies the blockage.
4. A tiny balloon is inflated to compress the clot and plaque.
5. A stent is placed to keep the artery open.

The procedure usually takes between 30 and 90 minutes.

Primary PCI has become the gold standard because it restores blood flow more effectively than clot-dissolving medications and reduces the risks of stroke, recurrent heart attack, and death.

Coronary Stents

After balloon angioplasty, most patients receive a coronary stent.

A stent is a small metal mesh tube that supports the artery from within.

Two main types are used:

Bare-Metal Stents (BMS)

These were widely used in the past but have a higher risk of restenosis, meaning the artery may narrow again.

Drug-Eluting Stents (DES)

These stents slowly release medication that inhibits excessive tissue growth inside the artery.

Drug-eluting stents are now the standard choice because they significantly reduce the risk of restenosis.

After receiving a stent, patients must take prescribed antiplatelet medications consistently to prevent clot formation inside the stent.

Thrombolytic Therapy

When PCI cannot be performed quickly, thrombolytic therapy may be used.

Thrombolytic drugs dissolve blood clots blocking the coronary artery.

Common medications include:

• Alteplase
• Tenecteplase
• Reteplase

These drugs work best when administered within the first few hours after symptom onset.

However, they carry a risk of serious bleeding, including bleeding inside the brain.

Therefore, careful evaluation is necessary before administration.

Rescue PCI

Sometimes thrombolytic therapy fails to restore blood flow.

In these cases, emergency angioplasty, known as rescue PCI, is performed to reopen the blocked artery.

Coronary Artery Bypass Grafting (CABG)

Some patients have severe blockages involving multiple coronary arteries.

Others have disease affecting the left main coronary artery or anatomy unsuitable for stenting.

These patients may require coronary artery bypass graft surgery.

During CABG:

• A healthy blood vessel is taken from the leg, arm, or chest.
• The surgeon creates a new pathway around the blocked artery.
• Blood reaches the heart muscle through this bypass.

CABG is particularly beneficial for:

• Diabetes patients with multiple blocked arteries
• Left main coronary artery disease
• Complex three-vessel disease
• Failed angioplasty

Although bypass surgery is a major operation, it often provides excellent long-term results.

Treatment of Arrhythmias

Heart attacks frequently cause dangerous rhythm disturbances.

Treatment depends on the specific arrhythmia.

Examples include:

• Defibrillation for ventricular fibrillation
• Temporary pacemaker for severe heart block
• Antiarrhythmic medications such as amiodarone
• Electrical cardioversion when necessary

Continuous ECG monitoring is essential during the first 24 to 48 hours after a heart attack.

Treatment of Cardiogenic Shock

Cardiogenic shock occurs when extensive heart muscle damage prevents the heart from pumping enough blood to maintain circulation.

Treatment may include:

• Intravenous fluids (carefully selected)
• Vasopressor medications
• Inotropic medications
• Mechanical circulatory support devices
• Emergency PCI
• CABG when indicated

Cardiogenic shock remains one of the most serious complications of myocardial infarction.

Mechanical Circulatory Support

In critically ill patients, temporary devices may assist the heart.

Examples include:

• Intra-aortic balloon pump (IABP)
• Impella ventricular assist device
• Extracorporeal membrane oxygenation (ECMO)

These technologies temporarily support circulation while the heart recovers or until definitive treatment is performed.

Intensive Cardiac Care Unit

Following emergency treatment, most patients are admitted to a Coronary Care Unit (CCU) or Intensive Care Unit (ICU).

Continuous monitoring includes:

• Heart rhythm
• Blood pressure
• Oxygen levels
• Urine output
• Laboratory tests
• Heart function

Most dangerous arrhythmias occur during the first 24 hours, making close observation essential.

Medications Started During Hospitalization

Several medications are commonly initiated soon after a heart attack:

• Aspirin
• Second antiplatelet drug
• Statin
• Beta blocker
• ACE inhibitor or ARB
• Anticoagulant
• Nitroglycerin when needed

These medications improve survival and reduce future cardiovascular events.

Why Rapid Treatment Matters

Prompt treatment offers numerous benefits:

• Preserves heart muscle.
• Improves pumping function.
• Reduces heart failure.
• Lowers the risk of arrhythmias.
• Decreases mortality.
• Shortens hospital stay.
• Improves long-term quality of life.

Patients treated early generally recover more quickly and have better long-term outcomes.

Common Mistakes During a Heart Attack

Several mistakes can delay life-saving treatment:

• Ignoring symptoms
• Waiting for pain to disappear
• Driving yourself to the hospital
• Taking unapproved home remedies instead of seeking medical care
• Continuing physical activity despite chest pain
• Delaying calling emergency services

Public education about heart attack recognition remains one of the most effective ways to improve survival.

Chapter Summary

Emergency treatment of a heart attack focuses on restoring blood flow to the heart as quickly as possible. Early recognition, rapid activation of emergency medical services, prompt use of aspirin when appropriate, ECG evaluation, antiplatelet and anticoagulant therapy, and emergency c

oronary angioplasty with stent placement have transformed survival rates. When angioplasty is not possible, thrombolytic therapy or coronary artery bypass surgery may be required. Every minute saved preserves heart muscle and improves the patient’s chances of a full recovery.

In the next chapter, we will discuss the complications of a heart attack, including heart failure, arrhythmias, cardiogenic shock, valve damage, ventricular rupture, blood clots, recurrent heart attacks, sudden cardiac arrest, and long-term effects on heart function.