an enlarged heart is not a condition itself, but the result of another process. You need to know why you have an enlarged heart
part of it is enlarged
. An echo, an EKG, possibly a Holter monitor would all be good tests to have to determine heart function, possible causes and if there are any associated arrhythmias - either causing or resulting from the cardiomegaly. I know this is scary, and I know first hand what it feels like to hear those words come out of the doctor's mouth.