Abstract
Simultaneous digital plethysmographic and brachial arterial pressure recordings in 11 normal subjects at rest in bed in a comfortable atmosphere showed that the spontaneous variations in digital volume (alpha and beta deflections) were independent of variations in arterial blood pressure. This indicates that the regulation of the caliber of the peripheral blood vessels as well as the spontaneous variations in the volume of the digital vessels is not passively produced by fluctuations in arterial blood pressure, including the Traube-Hering waves, but must be controlled by different centers and pathways of the sympathetic nervous system. Submitted on July 27, 1959
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