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Cardiology2113 papers

Angina pectoris

Last edited: 28 days ago

Overview

Angina pectoris is characterized by recurrent episodes of chest pain or discomfort due to myocardial ischemia, typically caused by coronary artery disease. It significantly impacts quality of life and is a major risk factor for cardiovascular morbidity and mortality. Affecting both sexes but more commonly seen in older adults and those with traditional risk factors like hypertension, hyperlipidemia, and diabetes, angina pectoris necessitates prompt and personalized management to prevent progression to more severe cardiovascular events. Understanding and effectively managing angina is crucial in day-to-day practice to alleviate symptoms, improve functional capacity, and reduce the risk of adverse outcomes 1 2 3 4.

Pathophysiology

Angina pectoris arises primarily from an imbalance between myocardial oxygen supply and demand. In patients with obstructive coronary artery disease (CAD), this imbalance is often due to atherosclerotic plaques narrowing the coronary arteries, reducing blood flow during periods of increased cardiac workload. The resulting ischemia triggers pain via activation of afferent pain pathways and the release of inflammatory mediators and neurotransmitters such as adenosine and neuropeptides 5 6. In cases of angina with nonobstructive coronary arteries (ANOCA), the pathophysiology may involve microvascular dysfunction, endothelial impairment, and impaired coronary flow reserve, leading to similar symptoms despite normal epicardial coronary arteries 7 8. These mechanisms underscore the need for a multifaceted approach to diagnosis and treatment, tailored to the underlying pathophysiology 9 10.

Epidemiology

The incidence of angina pectoris varies globally but is notably higher in regions with prevalent cardiovascular risk factors. In Western populations, the prevalence is approximately 5-10% in individuals over 65 years old, with a slight male predominance 1. Geographic variations exist, with higher rates observed in certain Middle Eastern countries due to lifestyle and environmental factors 1. Trends over time show an increasing prevalence linked to aging populations and rising rates of obesity and diabetes 11. Risk factors such as smoking, hypertension, hyperlipidemia, and diabetes significantly contribute to the burden of angina, highlighting the importance of preventive strategies and early intervention 12.

Clinical Presentation

Angina pectoris typically presents with substernal chest discomfort often described as pressure, tightness, or squeezing, lasting minutes and precipitated by physical exertion or emotional stress. Typical angina is well-correlated with exertion and relieved by rest or nitroglycerin. Atypical presentations may include nocturnal angina, spontaneous episodes without clear triggers, or pain radiating to the jaw, neck, back, or arms. Red-flag features include sudden onset, severe intensity, prolonged duration (>20 minutes), and associated symptoms like syncope, diaphoresis, or dyspnea, which may indicate acute coronary syndrome or other serious conditions requiring urgent evaluation 13 14.

Diagnosis

The diagnostic approach to angina pectoris involves a comprehensive clinical evaluation, supplemented by diagnostic testing to differentiate between stable angina, unstable angina, and angina with nonobstructive coronary arteries (ANOCA). Key steps include:

Clinical History and Physical Examination: Detailed history focusing on symptom characteristics, triggers, and relieving factors.

Electrocardiogram (ECG): Baseline ECG and stress ECG to identify ischemic changes.

Coronary Angiography: Essential for assessing coronary anatomy and identifying obstructive CAD.

Coronary Flow Reserve (CFR) and Index of Microcirculatory Resistance (IMR): In ANOCA, these tests help evaluate microvascular function.

Echocardiography: Useful for assessing left ventricular function and regional wall motion abnormalities.

Cardiac Biomarkers: Troponin levels to rule out acute coronary syndrome.

Specific Criteria and Tests:

Stress Testing: Positive stress test indicative of ischemia.

CFR < 2.0: Suggests impaired microvascular function.

IMR > 25: Indicative of increased microvascular resistance.

HbA1c ≥ 6.5%: Elevated in patients with poorly controlled diabetes, a risk factor for angina.

BP ≥ 140/90 mmHg: Hypertension as a modifiable risk factor.

LDL ≥ 130 mg/dL: Elevated LDL cholesterol levels requiring management.

Differential Diagnosis:

Pericarditis: Characteristic pleuritic chest pain, pericardial friction rub on auscultation.

Pulmonary Embolism: Sudden onset, pleuritic chest pain, hypoxia, and D-dimer elevation.

Aortic Dissection: Severe, tearing chest pain radiating to the back, often with hypotension.

Gastroesophageal Reflux Disease (GERD): Pain relieved by antacids, often worse lying down.

Management

First-Line Management

Lifestyle Modifications: Smoking cessation, dietary changes, weight management, and regular physical activity.

Pharmacotherapy:

- Beta-Blockers: Metoprolol 25-100 mg bid (Evidence: Strong) 15 - Calcium Channel Blockers: Amlodipine 5-10 mg daily (Evidence: Strong) 16 - Nitrates: Glyceryl trinitrate sublingual spray as needed (Evidence: Strong) 17 - Statins: Atorvastatin 20-80 mg daily to achieve LDL < 100 mg/dL (Evidence: Strong) 18

Second-Line Management

Additional Pharmacotherapy:

- Ranolazine: 500-1000 mg bid for angina frequency (Evidence: Moderate) 10 - ACE Inhibitors/ARBs: Lisinopril 10-20 mg daily for hypertension and heart failure prevention (Evidence: Strong) 19

Revascularization Procedures:

- Percutaneous Coronary Intervention (PCI): For significant obstructive CAD (Evidence: Strong) 20 - Coronary Artery Bypass Grafting (CABG): In cases of multivessel disease or left main stenosis (Evidence: Strong) 21

Refractory Angina

Advanced Therapies:

- Spinal Cord Stimulation (SCS): For refractory cases, consider SCS with high-density leads (Evidence: Moderate) 18 - Coronary Sinus Reducer (CSR): Implantation to improve myocardial perfusion (Evidence: Moderate) 29 30 - Enhanced External Counterpulsation (EECP): Non-invasive option for symptom relief (Evidence: Moderate) 19

Contraindications

Beta-Blockers: Asthma, severe bradycardia, heart block (unless paced)

Nitrates: Severe hypotension, right ventricular failure

Complications

Acute Complications:

- Myocardial Infarction: Progression to unstable angina or MI if ischemia is severe and prolonged. - Arrhythmias: Ventricular tachycardia, atrial fibrillation due to ischemia.

Chronic Complications:

- Heart Failure: Progression of left ventricular dysfunction. - Reduced Quality of Life: Persistent symptoms impacting daily activities. Refer patients with recurrent acute complications or refractory symptoms to cardiologists for advanced interventions and specialist care 2 3.

Prognosis & Follow-Up

The prognosis of angina pectoris varies based on the underlying cause and response to treatment. Prognostic indicators include the extent of CAD, left ventricular function, and control of risk factors. Regular follow-up intervals typically include:

Initial Follow-Up: Within 1-2 weeks post-diagnosis to assess symptom control and adjust therapy.

Ongoing Monitoring: Every 3-6 months to evaluate medication efficacy, adjust lifestyle interventions, and monitor biomarkers like troponin and BNP.

Annual Assessments: Comprehensive evaluations including ECG, stress testing, and lipid profiles to manage risk factors effectively 44 45.

Special Populations

Pregnancy: Close monitoring of angina symptoms and risk factors; avoid non-essential interventions; consider beta-blockers cautiously (Evidence: Moderate) 22.

Elderly: Tailored management focusing on minimizing polypharmacy and optimizing functional capacity (Evidence: Moderate) 23.

Comorbidities: Patients with diabetes require stringent glycemic control alongside angina management (Evidence: Strong) 12.

Ethnic Risk Groups: Middle Eastern populations may benefit from culturally tailored lifestyle interventions and closer monitoring of risk factors (Evidence: Moderate) 1.

Key Recommendations

Initiate Lifestyle Modifications: Smoking cessation, dietary changes, and regular exercise (Evidence: Strong) 1.

Prescribe Beta-Blockers: For symptom control and risk reduction (Evidence: Strong) 15.

Use Stress Testing: To differentiate stable from unstable angina (Evidence: Strong) 13.

Consider Coronary Angiography: For patients with refractory symptoms or suspected complex CAD (Evidence: Strong) 20.

Implement Pharmacological Therapy: Including statins, nitrates, and calcium channel blockers based on individual risk factors (Evidence: Strong) 16 17 18.

Evaluate Microvascular Function: In patients with ANOCA using CFR and IMR (Evidence: Moderate) 3 7.

Refer for Advanced Therapies: Such as SCS or CSR for refractory angina (Evidence: Moderate) 18 29.

Monitor Biomarkers Regularly: Troponin and BNP levels to assess disease progression (Evidence: Moderate) 45.

Tailor Management to Special Populations: Considering unique needs in pregnancy, elderly, and ethnic subgroups (Evidence: Moderate) 22 23 1.

Ensure Regular Follow-Up: To adjust treatment and monitor long-term outcomes (Evidence: Strong) 44.

References

Showing 100 most recent of 1513 indexed papers.

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