What is a heart murmur and how does it affect my enlarged heart?

Turbulence: A murmur is audible turbulence in the heart. It can be from vavular heart disease or other structual abnormalities. It can be innocent and not be clinically relevent. You can get a murmur with fevers, fast heart rates, and thyroid disease.Some times if the heart dilates the valves can incompletely close and cause a murmur. Would need more info to specifically answer your question.

Sound in the heart: When blood flows through the heart valve and if there is incompetence of the valve or narrowing of the valve, if produces a sound which a phsycian can dtect listening throug a stethoscope.

Sound in the heart: When you hear blood flow through a competent or narrow hear valve, it is a heart murmur. It it is singificant, it can enalrge heart chambers due to excessive blood flow.