title: Characteristic features of the differential sphygmogram in peripheral vascular dilation.
abstract: Characteristic features of differential sphygmogram were investigated in persons in whom the radial circulation had been interrupted in order to produce a partial distension of muscular-type arteries and minute peripheral vessels. Eighteen subjects aged 20-35 years were examined. The differential and volume sphygmograms were recorded in the radial artery. After a five-minute stoppage of the circulation, the following characteristic features of the differential sphygmogram were observed: 1) the differential curve assumed the shape of a triangle with a broad base; 2) the amplitudes of all wave components decreased, the B wave disappeared, the V2 wave was minimal, and the t2 time considerably extended. The ratios V2/V1 and V2/(V1 +V2) were considerably diminished. These ratios may serve as fundamental criteria for the appraisal of vascular elastic properties in an intact organism.
mesh_terms: D001794:Blood Pressure; D001808:Blood Vessels / Q000502:physiology*; D004106:Dilatation; D004548:Elasticity; D006801:Humans; D009129:Muscle Tonus; D009130:Muscle, Smooth / Q000098:blood supply; D011674:Pulse; D014655:Vascular Resistance