Can an ejection fraction of 25% be improved?

My husband was recently hospitalized because he had a hard time breathing. We found out he is a diabetic and has heart failure. After several tests and a whole week of trying to stablize his heart rate with many medications, he was diagnosed with atrial fibrillation and only 25% ejection fraction. He won't be able to see a cardiologist for another 3 weeks or so and it worries me. He is a 47 year old police officer, quit smoking since his hospitalization and he never abused alcohol. He is taking several prescribed medications and insulin and I record his blood pressure and heart rate daily. We'll wait to see a specialist but the physician made it seem like he was doomed with an ejection fraction that low. So, my question is, can his ejection fraction of 25% be improved?