Heart murmur Heart murmurs can be appreciated by auscultation of the heart by stethoscope. Murmurs can be further categorized by intensity (6 grades), duration, timing (systolic, diastolic, or continuous), location, transmission, and quality (musical, vibratory, blowing, etc). Heart murmur Cardiac murmurs Cardiac murmur UMLS:C0018808 An extra or unusual sound heard during a heartbeat caused vibrations resulting from the flow of blood through the heart. SNOMEDCT_US:414786004 SNOMEDCT_US:421493004 Heart murmurs SNOMEDCT_US:88610006 Abnormal heart sound