Murmur are common in the Adult population. If you as driver have a murmur. You must find out from your treating Doctor what grade of murmur you have.
FMCSA guild lines states that grade 1 and 2 is consider normal. Ove grade 2 you must have a cardiologist evaluation.
Cardiology A standard system for indicating the intensity of cardiac sounds, based on a scale of 1 to 6, by stethoscope. See Gallop, Murmur.
Murmur grades1 Barely audible-requires concentration 2 Soft, easily heard 3 Loud w/o thrill 4 Loud with thrill 5 Loud with minimal contact between stethoscope and chest 6 Loud with no contact between stethoscope and chest .