For some insight, dilated left ventrice is a condition where normally the heart's chamber is increased and decreased as a compensatory component together with variations in blood pressure and heart rate to maintain a balance of blood flow between the right and left chambers. The greater the dilatation the stronger the contractions.
Problem develops when the dilatation is the result of "overcompensation". Usually the result of an increase workload caused by the high resistance the heart pumps against when there is narrow vessels, etc. If the underlying cause can be successfully treated the remodeled heart can return to a normal size.
Six years ago I had an enlarged left venticle and low contractility of the heart's pumping ability. The underlying cause was ischemia (occluded vessels) and vessel stenosis (narrow vessels)causing high blood pressure. A stent and medication to dilate vessels lowered the heart's workload and the enlarged heart and functionality returned to normal.
Concentric, restrictive type of cardiomyopathy is an enlargement of the left ventricle and the enlargement is related to thickened heart walls that crowd out filling capacity, reduces flexibility and that lowers cardiac output. That condition does not bode well for complete recovery as does a dilated cardiomyopathy.
Hope this helps, and thanks for your question.
Exercise, diet, medicines and lifestyle changes can improve the heart's functionality even in cardiomyopathy.
It depends. Do you have anymore information?