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Diastolic murmurs are murmurs heard during diastole, between the second heart sound (S2) and the first heart sound (S1). Compared to systolic murmurs, diastolic murmurs are more difficult to hear with traditional auscultation and almost always indicate heart disease.
One of the two basic types of diastolic murmurs, early decrescendo diastolic murmurs suggest regurgitant flow through an incompetent semilunar (aortic or pulmonary) valve.
The other basic type of diastolic murmur, a rumbling diastolic murmur in mid or late diastole suggests the abnormal narrowing (stenosis) of an atrioventricular (mitral or tricuspid) valve.
