HI, thanks for using healthcare magic Enlargement of different areas of the heart most commonly occurs in response to heart failure, hypertension, congenital changes, vitamin deficiency, amylodosis,infection, thyroid disease,side effect of medication or treatment. These are only some of the possible causes. IN most cases the changes cannot be reversed but can be controlled by treating the cause. If the cause of the enlargement is known and treated then it is possible that you may have no further changes. There are medications that can be used to treatment palpitations. Most belong to the beta blocker family of drugs eg atenolol, propanolol, bisoprolol, carvedilol, metoprolol I hope this helps