Heart murmur
Medical condition
Summary
Heart murmurs are unique heart sounds produced when blood flows across a heart valve or blood vessel. This occurs when turbulent blood flow creates a sound loud enough to hear with a stethoscope. The sound differs from normal heart sounds by their characteristics. For example, heart murmurs may have a distinct pitch, duration and timing. The major way health care providers examine the heart on physical exam is heart auscultation; another clinical technique is palpation, which can detect by touch when such turbulence causes the vibrations called cardiac thrill. A murmur is a sign found during the cardiac exam. Murmurs are of various types and are important in the detection of cardiac and valvular pathologies.
Originally created by Tristanb
5/31/2003, 2:12:20 AM
Modified
5/7/2026, 4:54:30 AM
Recent revisions
Updated pulmonary systolic ejection click information according to a book chapter catalogued in NLM.
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I added information about pediatric heart murmurs and their diagnosis, as well as key terms like innocent versus pathologic heart murmurs.
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A heart murmur is almost always pathological to some degree. It is distinct from an abnormal heart rhythm, or arrhythmia. It is also distinct from a normal heart rhythm found on the electrocardiogram (ECG/EKG). Heart murmurs are also not the same as normal cardiac/respiratory sounds auscultated (heard) by the stethoscope.
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