Abstract
Mid-diastolic murmurs were recorded in patients with atrial and ventricular septal defects, rheumatic mitral insufficiency, and miscellaneous cardiac abnormalities. In each instance the oscilloscopic trace showed a fairly regular wave form with low frequency of vibration. Sound spectrography confirmed the concentration of the vibrational energy in the low-frequency range. The similarity of the characteristics of these murmurs suggests a common mechanism of origin: vibration of a solid structure, such as valve leaflets or annulus, during ventricular filling. The postulated vibrational mechanism would explain the physical resemblance of these traces to those of the innocent cardiac murmurs of childhood.
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