Ischemic heart disease
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Ischemic Heart Disease Overview and Epidemiology
Ischemic heart disease (IHD), also known as coronary artery disease (CAD) or coronary heart disease (CHD), is caused by reduced blood flow to the heart muscle, usually due to atherosclerosis or narrowing of the coronary arteries. This imbalance between oxygen supply and demand leads to a range of clinical problems, from chest pain (angina) to heart attacks (myocardial infarction) and heart failure 234. IHD remains the leading cause of death worldwide, affecting millions and causing significant financial and social burdens 2467. While mortality rates have declined in many developed countries, IHD continues to be a major health issue globally, with variations in rates between countries and ongoing challenges due to rising obesity and diabetes 67.
Clinical Presentations and Risk Factors
IHD presents as either acute coronary syndromes (such as unstable angina and acute myocardial infarction) or chronic coronary syndromes (stable angina and chronic heart disease) 14. Major risk factors include hypertension, smoking, diabetes, obesity, and high cholesterol. In people with diabetes, IHD is the main cause of illness and death, and the risk of heart failure is significantly higher 47. Lifestyle-related factors, such as poor diet and lack of exercise, are increasingly recognized as key contributors to the development and progression of IHD .
Diagnosis and Noninvasive Imaging Techniques
Diagnosing IHD often starts with noninvasive imaging to assess the presence and severity of coronary artery disease, especially when symptoms are present but obstructive disease cannot be ruled out by clinical assessment alone 18. Coronary computed tomography (CT) angiography is now a first-line test in suitable patients due to its high accuracy in ruling out disease. Other noninvasive tests, such as cardiac MRI, PET, SPECT, and stress echocardiography, help determine the physiological significance of coronary artery blockages and detect previous heart attacks 18. These imaging techniques are essential for guiding treatment decisions and improving patient outcomes 18.
Treatment Approaches: Medical, Surgical, and Emerging Therapies
Optimal medical therapy, including medications to control blood pressure, cholesterol, and blood clotting, remains the cornerstone of IHD management 15. For patients who do not respond to medications, procedures like percutaneous coronary intervention (PCI) with stenting or coronary artery bypass grafting (CABG) can relieve symptoms and reduce the risk of future heart attacks 15. Newer approaches, such as fractional flow reserve (FFR)-guided revascularization, help identify which blockages need intervention .
Biopharmaceutical therapies, including protein, gene, and cell therapies, are being explored to promote new blood vessel growth and improve blood flow in the heart. Stem cell therapy, using cells from bone marrow, fat tissue, or induced pluripotent stem cells, shows promise in repairing heart tissue and improving heart function after injury, though more research is needed to confirm long-term benefits 510.
Prevention and Lifestyle Modification
Lifestyle changes are critical for both preventing and managing IHD. Smoking cessation, adopting a Mediterranean or plant-based diet, and regular physical activity can significantly reduce the risk of developing IHD and improve outcomes in those already affected 19. These preventive strategies are emphasized in current clinical guidelines and are essential for reducing the overall burden of IHD .
Global Trends and Future Directions
While IHD mortality is declining in many high-income countries, the disease remains a top cause of death worldwide, with increasing rates in some developing regions due to rising obesity and diabetes 67. Continued progress in prevention, early diagnosis, and innovative treatments is needed to further reduce the impact of IHD globally 67.
Conclusion
Ischemic heart disease is a complex and widespread condition with significant health and economic impacts. Advances in diagnostic imaging, medical and surgical treatments, and emerging therapies like stem cell transplantation offer hope for better management and outcomes. However, prevention through lifestyle modification remains the most effective strategy for reducing the burden of IHD worldwide 1245+5 MORE.
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