It depends on the cause and what part of the heart is enlarged, did they give you a diagnosis for youre condition? Is it your entire heart and did they give it a name? It is possible for the heart to re-model istself under certain conditions.
As Jon states it depends on the underlying cause. My experience the heart remodeled (dilated type) due to weak contractions (some impairment of heart muscle) and heavy workload (high blood pressure) for the heart to pump against. By reducing the heart's afterload (bp meds, beta blocker, med to increase contractions, etc) there has been a reverse remodeling and my heart size is within the normal range. The heart compensated with minor dilation and then overcompensated that impeded contractions effecting the heart's pumping efficiency and eventually heart failure.
If the heart has pathologically enlarged with heart muscle disease, the heart walls thicken and loses its flexibility. Sometimes ablation (surgically remove growth) is performed. The enlargement can be due to valve stenosis, mitral valve regurgitation, tortuous aorta, etc.
Minimal enlargement can indicate an athlete's heart where the left ventricle is enlarged and a normal consequence of a healthy efficient heart ( resting heart rate below 60 bpm). Was the enlargement dx with an echo or x-ray images? Sometimes not a very reliable source when the comment is slightly enlarged as the echo is an estimate and images may be unclear.
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