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Angina pectoris, often simply called angina, is a medical term for chest pain or discomfort due to reduced blood flow to the heart muscle. It's not a disease itself, but rather a symptom of an underlying heart condition, most commonly coronary artery disease (CAD).

Understanding Angina Pectoris

The heart muscle (myocardium) requires a constant supply of oxygen-rich blood to function properly. This blood is delivered through the coronary arteries. When these arteries become narrowed or blocked due to plaque buildup (atherosclerosis), the heart muscle may not receive enough oxygen, especially during periods of increased demand like exercise or stress. This oxygen deprivation leads to the characteristic pain or discomfort of angina.

The term "angina pectoris" is derived from Latin: "angere" meaning to strangle or choke, and "pectus" meaning chest. This perfectly describes the sensation many people experience.

Types of Angina

Angina can manifest in different ways, and understanding these types is crucial for diagnosis and treatment:

1. Stable Angina (Chronic Angina)

• Description: This is the most common type. It occurs predictably when the heart is working harder, such as during physical exertion, emotional stress, or exposure to cold weather. The pain is usually relieved by rest or nitroglycerin.
• Mechanism: The coronary arteries are narrowed, limiting blood flow. During increased demand, the heart can't get enough oxygen.
• Characteristics:
• Predictable pattern (same triggers, same intensity, same relief).
• Lasts a few minutes (typically 1-5 minutes).
• Relieved by rest or sublingual nitroglycerin.
• Does not worsen over time in terms of frequency or intensity.

2. Unstable Angina

• Description: This is a more serious and unpredictable form of angina. It's often considered a medical emergency and a warning sign of an impending heart attack.
• Mechanism: The plaque in the coronary artery may have ruptured, leading to clot formation that further narrows or temporarily blocks the artery, even at rest.
• Characteristics:
• Occurs unexpectedly, often at rest or with minimal exertion.
• May be more severe, last longer (more than 10-20 minutes).
• May not be relieved by rest or nitroglycerin.
• Can worsen over time (increasing frequency or intensity).
• New onset angina that is severe or occurs at rest.

3. Variant Angina (Prinzmetal's Angina)

• Description: This is a rare type of angina caused by a sudden spasm of the coronary arteries, temporarily narrowing them and reducing blood flow.
• Mechanism: Unlike stable or unstable angina, it's not primarily due to atherosclerosis but rather to temporary arterial spasms.
• Characteristics:
• Occurs typically at rest, often at night or in the early morning.
• Can be severe.
• Relieved by nitroglycerin.
• May be associated with other vasospastic conditions like Raynaud's phenomenon or migraines.

4. Microvascular Angina (Syndrome X)

• Description: This type of angina occurs when there's pain but no significant blockages in the large coronary arteries. Instead, the problem lies in the tiny blood vessels (microvasculature) that supply the heart.
• Mechanism: The small blood vessels don't function properly, limiting blood flow to the heart muscle.
• Characteristics:
• Can be triggered by exercise or stress.
• Pain may last longer than stable angina.
• Often harder to diagnose as standard angiograms may appear normal.
• More common in women.

Symptoms of Angina

The primary symptom is chest pain or discomfort, which can be described in various ways:

• Pressure, squeezing, fullness, or tightness in the center of the chest.
• Burning sensation or indigestion-like feeling.
• Pain radiating to the left arm, neck, jaw, shoulder, or back.
• Shortness of breath.
• Sweating.
• Nausea.
• Fatigue.
• Dizziness.

It's important to note that symptoms can vary between individuals, and women, older adults, and people with diabetes may experience "atypical" symptoms, such as shortness of breath, nausea, or fatigue, without classic chest pain.

Causes and Risk Factors

The most common cause of angina is coronary artery disease (CAD), which is a result of atherosclerosis. Risk factors for CAD and thus angina include:

• High blood pressure (hypertension)
• High cholesterol (hyperlipidemia)
• Smoking
• Diabetes
• Obesity
• Lack of physical activity
• Family history of heart disease
• Age (risk increases with age)
• Stress

Diagnosis

Diagnosing angina typically involves:

• Medical history and physical exam: Discussing symptoms, risk factors, and family history.
• Electrocardiogram (ECG/EKG): To check the heart's electrical activity.
• Blood tests: To check for markers of heart damage or risk factors like cholesterol.
• Stress test: To see how the heart performs under exertion (e.g., treadmill, pharmacological stress).
• Echocardiogram: An ultrasound of the heart to assess its structure and function.
• Coronary angiography: An invasive procedure using dye and X-rays to visualize the coronary arteries and identify blockages.
• CT angiography: A non-invasive imaging technique to visualize coronary arteries.

Treatment

Treatment for angina aims to reduce the frequency and severity of attacks, relieve symptoms, and prevent more serious cardiac events like heart attacks. It often involves a combination of lifestyle changes, medications, and sometimes medical procedures.

1. Lifestyle Changes

• Healthy diet: Low in saturated fats, trans fats, cholesterol, and sodium.
• Regular exercise: As advised by a doctor.
• Weight management.
• Smoking cessation.
• Stress management.
• Limiting alcohol intake.

2. Medications

• Nitrates (e.g., nitroglycerin): To relax and widen blood vessels, improving blood flow. Used to relieve acute attacks and prevent them.
• Beta-blockers: To slow the heart rate and reduce the heart's workload.
• Calcium channel blockers: To relax blood vessels and reduce the heart's workload.
• Antiplatelet drugs (e.g., aspirin): To prevent blood clots.
• Statins: To lower cholesterol levels and stabilize plaque.
• ACE inhibitors/ARBs: To lower blood pressure and protect the heart.
• Ranolazine: An anti-anginal medication that works differently from other drugs.

3. Medical Procedures

• Angioplasty and stenting (Percutaneous Coronary Intervention - PCI): A catheter with a balloon is used to open a blocked artery, and a stent (a small mesh tube) is often placed to keep it open.
• Coronary artery bypass grafting (CABG): A surgical procedure where a healthy blood vessel from another part of the body is used to bypass a blocked or narrowed coronary artery, creating a new path for blood flow.

When to Seek Medical Attention

Angina is a serious condition that requires medical evaluation. If you experience new or worsening chest pain, or if your angina symptoms change (e.g., occurring at rest, lasting longer, not relieved by nitroglycerin), seek immediate emergency medical attention. These could be signs of unstable angina or a heart attack.