"Patients with severe but stable heart disease who are treated with medications and lifestyle advice alone are no more at risk of a heart attack or death than those who undergo invasive surgical procedures, according to a large, federally funded clinical trial led by researchers at the Stanford School of Medicine and New York University’s medical school.
The trial did show, however, that among patients with coronary artery disease who also had symptoms of angina — chest pain caused by restricted blood flow to the heart — treatment with invasive procedures, such as stents or bypass surgery, was more effective at relieving symptoms and improving quality of life."
https://med.stanford.edu/news/all-news/2019/11/invasive-heart-treatments-not-always-needed.html
The trial did show, however, that among patients with coronary artery disease who also had symptoms of angina — chest pain caused by restricted blood flow to the heart — treatment with invasive procedures, such as stents or bypass surgery, was more effective at relieving symptoms and improving quality of life."
https://med.stanford.edu/news/all-news/2019/11/invasive-heart-treatments-not-always-needed.html