Genesis of Pistol-Shot and Korotkoff Sounds

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Abstract
Since spontaneous vascular sounds and Korotkoff sounds bear a close resemblence to each other and to the normal heart sounds, the intravascular pressure and sound relationships were investigated by mean of high speed recording. The consistent finding that the sound represented an acute disturbance in flow, moving ahead of the pulse wave suggested that rapid energy transfer occurred at this time. A general schema of the parameters of energy transfer involving mean blood velocity, elasticity, and rate of change of pressure and vessel diameter can be supported inasmuch as the production of spontaneous sounds can be accomplished in elastic arterial system of humans by increasing the magnitude of one or more of the parameters. Radiological evidence of the degree of vessel expansion with pulsatile flow is also presented.

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