Percutaneous coronary intervention (PCI), also known as coronary
angioplasty or angioplasty, is a minimally invasive procedure to treat coronary
artery disease by restoring blood flow to the heart. It involves inserting a
catheter with a balloon at its tip into the narrowed or blocked artery, inflating
the balloon to widen it, and often placing a stent to keep it open.

used to record a 12-lead ECG. The level of exercise is increased in 3-minute stages of progressively increased grade (% incline) and speed (mph, km/h, etc.). The patient’s symptoms and blood pressure response are repeatedly checked. The American Heart Association recommends ECG treadmill testing as the first choice for patients with medium risk of coronary heart disease based on the risk factors of smoking, family history of coronary stenosis, hypertension, diabetes, and high cholesterol.