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The primary purpose of this monograph is to present the technical details associated with a method of recording the rate of blood flow into and out of the digits of man. The author describes the various theoretic considerations involved in obtaining accurate readings, using the venous occlusion plethysmographic method. Attention is also called to the dangers of error encountered and to the means used to minimize or evade them. Through an analysis of the curves obtained from the finger with a double-beam plethysmograph, the author is able to measure the time course of the rate of blood into and out of the finger tip. He believes that the method should be applicable to the understanding of peripheral circulation in normal and abnormal vascular states; however, it is necessary to point out that the finger, containing large numbers of arteriovenous shunts, represents a specialized type of vascular bed and, hence, does
Digital Plethysmography: Introducing a Method for Recording Simultaneously the Time Course of the Rate of Blood Flow into and out of the Finger Tip. JAMA. 1954;156(7):749. doi:10.1001/jama.1954.02950070077027