What measurement means for heart bypass surgery

Heart bypass surgery, also known as coronary artery bypass grafting (CABG) is a procedure used to treat people with diseased coronary arteries (vessels that supply blood to the heart).

The coronary arteries carry oxygen and nutrient-rich blood to the heart muscles. They can become narrowed or blocked due to build-up of fat and cholesterol, called plaque deposits. CABG is a surgical procedure performed to reroute blood flow around blocked areas in the arteries to the heart. CABG may be used to prevent a heart attack or to treat chest pain or other heart problems resulting from the blockages.

Although heart bypass surgery is relatively safe, people having this procedure are at risk for complications:

  • Kidney failure
  • Bleeding or infection
  • Heart attack and stroke
  • Death
How to understand Proficiency Ratings

Hospitals performing 200 or more CABG procedures have achieved proficiency – this can be a sign of high-quality care. Hospitals performing less than 10 procedures may only do so on an emergency basis and their ratings are not included in this report.

How to understand Mortality Ratings

A high mortality rate may not be due to medical errors. Some hospitals may experience a greater number of deaths because they see more sick patients. Our mortality rate information is shown as a comparison between a hospital’s actual mortality rate and the rate expected for that hospital. A rate that is the “Same” or “Better” than expected can be a sign of high-quality care.