Key Points
A Heart murmur results from turbulent blood flow.
A complete history and physical examination are most important for evaluating a cardiac murmur.
The intensity of a murmur does not necessarily reflect the severity of abnormality.
Innocent murmurs are systolic, less than grade 3 in intensity, and louden when the patient moves from an upright position to a supine position.
Electrocardiography and echocardiography are usually performed to define the cause of a pathological murmur.
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