Percutaneous Coronary Intervention (PCI) is a medical procedure used to treat narrowed or blocked arteries in the heart. During PCI, a thin tube called a catheter is inserted through a blood vessel, usually in the arm or leg, and guided to the heart. A small balloon at the tip of the catheter is then inflated to open up the blocked artery, often followed by placing a stent to keep the artery open. This procedure helps improve blood flow to the heart, reducing symptoms like chest pain and shortness of breath. PCI is often recommended for patients with coronary artery disease, allowing them to return to their daily activities more quickly than with traditional surgery.