Nahhh, no such thing as dumbness! A hole in the heart can certainly cause a murmur, there are many types of murmurs, some are innocent and don't need any treatment, but then there are some that do need surgical intervention, like when a valve becomes so damaged, the blood doesn't flow the right direction and the heart isn't functioning correctly and needs to be replaced. When you listen to someone's chest with a sthethascope, you can actually tell where the murmur is and if you've got really good ears, what type as well. If there is a hole in the heart, like in an atrial septal defect, that murmur will be heard and believe me, it has a very distinct sound. Also what is interesting is that murmurs have different sounds, depending on what valve and what type of damage is done. I have heard murmurs so loud that I didn't even need a stethascope! I honestly could hear one patient's murmur at his bedside without a stethascope. He had very severe valve damage and needed a replacement. Heart arrythmia can certainly result from a damaged valve, mitral valve prolapse is famous for inducing the type of arrythmia I suffer from, supraventricular tachycardia....I also have a mild murmur, only a few docs have been able to pick it up, including my cardiologist. Hope I have helped..Jenn <img src="i/expressions/face-icon-small-smile.gif" border="0">