Coronary Artery Disease: Symptoms, Causes & Treatment

Coronary Artery Disease (CAD) is a chronic condition characterized by progressive narrowing of the coronary arteries that supply blood and oxygen to the heart muscle. The primary cause is the gradual accumulation of fatty deposits and cholesterol on artery walls, a process called atherosclerosis. Over time, this narrowing reduces the amount of blood reaching the heart, particularly during physical exertion or stress.

This disease causes various symptoms ranging from angina (chest pain during exertion) to acute myocardial infarction (heart attack when blood flow is completely blocked). CAD is among the most common heart diseases worldwide and is the leading cause of death in developed and developing countries. In Jordan, the disease represents a significant health burden, especially with the prevalence of risk factors such as obesity, diabetes, and hypertension.

Early diagnosis and effective treatment can control the disease and prevent progression. Severe cases may require advanced procedures such as cardiac catheterization or bypass surgery, while basic treatment relies on medications and lifestyle modifications.

Symptoms of Coronary Artery Disease range from mild to severe depending on the degree of artery narrowing. Some people experience no symptoms in early stages (a dangerous situation as it may lead to sudden heart attack), while others experience clear symptoms during exertion. Note that women may sometimes display different symptoms than men.

• Angina (Chest Pain): Pain or pressure in the chest, usually starting behind the breastbone, worsens with physical exertion or emotional stress, and improves with rest or nitrate medications.
• Chest Pain During Exertion: May be sharp or pressure-like, may radiate to the left arm, neck, or jaw.
• Shortness of Breath: Feeling breathless or suffocated, especially during physical activity.
• Fatigue and Exhaustion: Severe unexplained tiredness, noticeable even with simple activities.
• Dizziness and Lightheadedness: Feeling dizzy or loss of balance.
• Nausea: Especially accompanying severe chest pain.
• Anxiety and Stress: Some patients experience severe anxiety and a sense of impending doom.
• Cold Hands and Feet: Due to poor circulation.
• Irregular Heartbeat: Feeling rapid or irregular heart palpitations.
• Difficulty with Minor Exertion: Such as climbing stairs or brisk walking.
• Worsening Symptoms in Early Morning: Symptoms may be worse in the early morning hours.
• Important Note for Women: Women may experience atypical symptoms such as severe fatigue, shortness of breath, back or jaw pain, without obvious chest pain.

• Atherosclerosis: Accumulation of cholesterol and fats on coronary artery walls, causing progressive narrowing.
• High Blood Pressure: Elevated pressure on artery walls accelerates plaque formation.
• High Cholesterol: Particularly LDL cholesterol, which accumulates in artery walls.
• Smoking: Damages artery walls and increases cholesterol oxidation, accelerating atherosclerosis.
• Diabetes: Raises blood glucose levels, negatively affecting blood vessel health.
• Chronic Inflammation: Some inflammatory conditions (e.g., rheumatoid arthritis) increase disease risk.
• Psychological Stress and Anxiety: Raise cortisol and adrenaline levels, affecting blood vessels.
• Genetics: Individuals with a family history of heart disease are at higher risk.

• Age: Risk increases with age (45+ for men, 55+ for women).
• Sex: Men have higher risk at younger ages, but women's risk increases after menopause.
• Obesity: Excess weight increases strain on the heart and blood vessels.
• Sedentary Lifestyle: Lack of physical activity increases disease risk.
• Unhealthy Diet: High intake of saturated fats, salt, and sugar.
• Excessive Alcohol Consumption: Negatively affects heart and blood vessel health.
• Abdominal Obesity: Fat accumulation around organs increases risk significantly.
• Metabolic Syndrome: A combination of conditions (high blood pressure, diabetes, obesity) greatly increases risk.
• Sleep Apnea: Raises blood pressure and stress on the heart.
• Personal Medical History: Previous heart attack or stroke increases risk of recurrence.

Diagnosis of Coronary Artery Disease relies on a combination of clinical evaluation and advanced tests. Early and accurate diagnosis is crucial in preventing heart attacks.

• Clinical Examination: The doctor checks pulse, blood pressure, and listens to the heart with a stethoscope (may detect abnormal sounds).
• Electrocardiogram (ECG/EKG): Records the heart's electrical activity and detects arrhythmias or signs of previous injury. Normal readings show specific waves (P, QRS, T) in a regular pattern.
• Stress Test: Heart rate should reach 140-160 beats/minute during the test. Detects reduced blood flow to the heart during exertion.
• Echocardiography: Ultrasound examination shows heart muscle movement, size, and efficiency. Ejection Fraction should be above 50% (normal).
• Chest X-ray: Reveals heart enlargement or signs of heart failure.
• Blood Tests: Measure total cholesterol (should be below 200 mg/dL), LDL (preferably below 100), HDL (preferably above 40 for men, 50 for women), triglycerides (below 150), and cardiac enzymes (Troponin, CK-MB) that rise during heart attack.
• Cardiac Magnetic Resonance Imaging (MRI): Provides detailed images of heart muscle and blood flow.
• Nuclear Scan: Uses radioactive dye to track blood flow to the heart.
• Cardiac Catheterization and Coronary Angiography: Gold standard for diagnosis. A thin catheter is inserted through blood vessels into coronary arteries, and dye is injected to visualize arteries on X-rays. Detects degree and location of narrowing.

Medications

• Beta-blockers: Reduce heart rate and blood pressure, decreasing oxygen demand. Examples: metoprolol, atenolol.
• ACE Inhibitors: Help dilate blood vessels and lower blood pressure. Examples: lisinopril, enalapril.
• Calcium Channel Blockers: Relax blood vessels and reduce heart rate. Examples: amlodipine, diltiazem.
• Nitrates: Dilate blood vessels and reduce cardiac workload. Used for quick relief (sublingual glycerin) or long-term (nitrate patches).
• Aspirin: Blood thinner that prevents clot formation and reduces heart attack risk. Typical preventive dose is 75-100 mg daily.
• Other Blood Thinners (clopidogrel or ticagrelor): Given with aspirin after angioplasty (Dual Antiplatelet Therapy - DAPT).
• Cholesterol-Lowering Drugs (Statins): Reduce cholesterol levels and protect blood vessels. Examples: atorvastatin, simvastatin. High doses may reduce LDL below 70 mg/dL.
• Angiotensin II Receptor Blockers (ARBs): Safe alternative to ACE inhibitors if the latter is not tolerated.

Procedures and Interventions

• Percutaneous Coronary Intervention (PCI): A catheter with a balloon or metal stent is inserted into the narrowed artery to widen it. Usually for severe narrowing (>70%) or acute emergencies.
• Stents: Left in the artery after widening to prevent re-narrowing. May be bare metal (BMS) or drug-coated (DES).
• Coronary Artery Bypass Grafting (CABG): Performed when multiple arteries are severely narrowed or main artery is affected. A healthy blood vessel from the leg or chest is grafted to bypass the narrowed section.
• Cardiac Rehabilitation: Organized program including guided exercises, nutritional counseling, and psychological support.

Lifestyle Changes

• Quit Smoking: Essential for improving blood vessel health.
• Regular Physical Exercise: 150 minutes of moderate-intensity exercise weekly (e.g., brisk walking), or 75 minutes of vigorous exercise. Exercise strengthens the heart and improves circulation.
• Healthy Diet: Reduce saturated fats, salt, and sugar. Increase vegetables, fruits, omega-3 rich fish, and whole grains. Mediterranean diet is highly beneficial.
• Weight Loss: Losing 5-10% of current weight significantly improves heart health.
• Blood Pressure and Diabetes Control: Blood pressure should be below 130/80 mmHg; diabetes HbA1c below 7%.
• Stress Management: Use relaxation techniques like yoga or meditation; get adequate sleep (7-9 hours daily).
• Avoid or Severely Limit Alcohol.
• Regular Follow-up: Visit cardiologist regularly and undergo periodic screening.

• Myocardial Infarction (Heart Attack): A medical emergency where blood flow completely stops to a portion of heart muscle, causing tissue death. Can be fatal if untreated immediately.
• Heart Failure: Heart muscle becomes too weak to pump blood efficiently to nourish the body and lungs. Causes fluid accumulation and severe fatigue.
• Dangerous Arrhythmias: May cause ventricular fibrillation or cardiac arrest, fatal conditions if not treated immediately.
• Stroke: If a clot from heart arteries travels through blood to the brain and blocks a cerebral vessel, it may cause paralysis or permanent loss of abilities.
• Stable and Unstable Angina: Unstable angina is very dangerous as it may develop into heart attack at any moment.
• Heart Valve Weakness: Heart muscle damage may weaken valve function.
• Cardiac Rupture: A rare but fatal complication that may occur after acute heart attack.
• Secondary Pulmonary Hypertension: Elevated blood pressure in lung vessels resulting from chronic heart failure.

• Complete Smoking Cessation or Avoid Secondhand Smoke: Smoking is a major risk factor; quitting improves blood vessel health immediately.
• Maintain Healthy Weight: BMI should be between 18.5 and 24.9. Obesity increases cardiac strain.
• Regular Exercise: At least 150 minutes of moderate-intensity exercise weekly. Exercise reduces blood pressure, cholesterol, and improves heart health.
• Follow a Balanced and Healthy Diet: Increase vegetables, fruits, fish, and whole grains. Reduce saturated fats, salt, and sugar. Mediterranean diet is ideal.
• Blood Pressure Management: Regular monitoring and keeping pressure below 130/80 mmHg with medications if needed.
• Diabetes Control: Maintain appropriate blood sugar (HbA1c below 7%) through diet, exercise, and medications.
• Lower Cholesterol Levels: Follow healthy diet and take cholesterol-lowering drugs if needed. LDL should be below 100 mg/dL (or below 70 for high-risk individuals).
• Stress Management: Use relaxation techniques, yoga, meditation, or engage in enjoyable activities.
• Avoid or Severely Limit Alcohol: Excessive alcohol harms the heart and blood vessels.
• Regular Screening: For people over 40 (or with risk factors), routine checkups are important, including blood pressure, cholesterol, and blood sugar measurements.