Other functional murmurs can be present in athletes, and in pathologic states such as fever, anemia, or hypoproteinemia.Īnything that muffles the heart sounds can obscure a murmur such as obesity, thoracic effusions, or loud respiratory sounds. ![]() These are important features to distinguish innocent murmurs from congenital heart murmurs.Tend to vary in intensity with a change in HR or body position.Soft, low intensity sounds (grade 1/6 to 2/6).These murmurs should resolve by 6 months of age, and tend to have the following characteristics: Young animals (< 6 months of age) can have functional heart murmurs in absence of cardiac disease in other situations. In contrast, note that if blood viscosity is increased, a murmur may be masked. These murmurs are usually low grade (< grade 3). Not always A few examples of murmurs existing without cardiac disease:įunctional or physiologic murmurs can be associated with low blood viscosity (anemia, hypoproteinemia) instead of actual cardiac disease. patent ductus arteriosus, PDA)Īre murmurs always due to cardiac disease? Connections between the great vessels (i.e.interatrial and interventricular defects holes) ![]()
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