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Stress Test and Cardiomyopathy- Ejection fraction rate?

I had a stress test recently and I achieved up to 80%. I was previously diagnosed with a cardiomyopathy and about 6 months ago they said my ejection fraction rate was below 30, then i had another echograham about 3 months ago and they said my ejection fraction rate was 40. I have been taking several medications Ace inhibitors, Beta blockers, and a diuretic-

What does the stress test tell the doctor?

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The stress test does not tell anything to the doctor in particular, rather assist in performing the heart tests themselves.

Some heart problems are easier to diagnose when your heart is working hard and beating fast. During stress testing, you exercise (or are given medicine such as the beta blockers and ace inhibitors you mentioned) to make your heart work hard and beat fast while heart tests are done.

These tests may include nuclear heart scanning, echocardiography, magnetic resonance imaging (MRI), and positron emission tomography (PET) scanning of the heart.