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Ejection fraction can improve in some people on proper medical therapy. While exercise doesn't result in the significant improvement in heart function (in most studies) that we'd hope for, it can improve quality of life and functional capacity. I'd talk with the cardiologist about an exercise prescription and whether cardiac rehabilitation could be a possibility.
Your doctor can also use it to see if your heart failure is getting worse. This test can measure how much blood your heart pumps to your body. This measurement is called the ejection fraction. If your ejection fraction gets lower and you are having more symptoms, it means that your heart failure is getting worse.