Percutaneous coronary intervention (PCI) is a clinical procedure that is performed to treat stenosis of the coronary arteries of the heart. It involves the visualization of the blood vessels using coronary catheterization and X-ray imaging, followed by a coronary angioplasty using a balloon catheter. This ensures that the obstructed artery is inflated to relieve the narrowing. Stents are then deployed to keep the opening of the vessel intact. PCI is appropriate in case of stable coronary artery disease, or when coronary stenosis is more than 50%, or when angina symptoms are unresponsive to therapy. Percutaneous coronary angioplasty is a common procedure with no major complications. Mostly after three months of the procedure, the artery sufficiently heals and no longer requires the stent. This book contains some path-breaking studies in the field of coronary interventions. It outlines the procedures and practices of percutaneous coronary intervention in detail. This book includes contributions of experts and scientists which will provide innovative insights into cardiology.