I think you are saying that with medical therapy your heart function has improved from a low number Ejection Fraction (EF) to an EF of about 20%. The likelihood of completely recovery of heart function is very low in patient with such low EF's and medical therapy typically improves symptoms and not necessarily the EF. So based on an EF of 20% you would qualify for an ICD, a special pacemaker, which protects you from fast heart rates that are dangerous. You may also qualify for a Bi-V ICD if there are baseline problems in the electical system of the heart. Your cardiologist will make that decision.
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