answer:Well a heart murmur is an extra or unusual sound heard during a heartbeat. Murmurs range from very faint to very loud. Sometimes they sound like a whooshing or swishing noise. Normal heartbeats make a “lub-DUPP” or “lub-DUB” sound. This is the sound of the heart valves closing as blood moves through the heart. Doctors can hear these sounds and heart murmurs using a stethoscope. Some children just have a murmur and it goes away as they age but other times it can be caused by something being wrong with the heart. A heart murmur can be caused from a hole in the heart called a ASD (atrial septal defect) and/or VSD (Ventricular Septal Defect) my daughter was diagnosed with both and right now the VSD closed but the ASD is still there, if it causes her problems they can surgically close it later in life. She also has elongated ventricles but that does not cause a murmur but could send her into congestive heart failure at some point in her life, doctors are unsure if it will streghten over time or not. My father also had a heart murmur from Rheumatic fever as a baby which put a scar on his heart which I believe was a big contributing factor of his massive heart attack and death at age 40. This is as much as I know about on the subject and unfortunately its from personal experience.