What Are We Measuring?

A heart attack, also called a myocardial infarction, occurs when the heart muscle doesn’t receive sufficient oxygen due to a blockage of blood flow to the heart.

The Centers for Medicare and Medicaid Services (CMS) evaluates 30-day mortality and readmission rates for heart attack patients:

  • 30-Day Mortality Rate: The percentage of heart attack patients who died within 30 days of admission to the hospital
  • 30-Day Readmission Rate: The percentage of heart attack patients who were discharged from the hospital and were readmitted to any hospital for any reason in the next 30 days

Below are two charts showing Massachusetts General Hospital’s performance compared to national benchmarks on these measures.

How We Are Performing?

Heart Attack 30-Day Mortality Rate

Lower scores are better 

The following chart shows the 30-Day Heart Attack mortality rate.
Data Source: CMS Hospital Compare

Heart Attack 30-Day Readmission Rate

Lower scores are better

The following chart shows the 30 Day Heart Attack readmission rate.
Data source: Hospital Compare.

   ★ Performance is statistically better than the benchmark
= Performance is statistically similar to the benchmark
   ▼ Performance is statistically worse than the benchmark