THIS IS a study based on 571 cases in which the plethysmograph was used as a corroborative aid in the clinical appraisal of patients with peripheral vascular diseases. The direct writing pneumoplethysmograph employed (Vasograph)* records volume changes of an end organ, such as a finger or a toe, and pulse volume in a segment of limb. It is useful in measuring relative blood flow, resting blood flow, and maximum blood flow after various vasodilating measures.
The plethysmographic methods used in this study have been described previously.1,2 The patient is studied in the supine position on a comfortable bed in a room kept at 24 C. A plastic cup is sealed to a digit in such a way that 4 cc of digit is encased within the cup (Fig 1). The left index finger, left second toe, and right second toe are the digits usually used. The temperature of
GASPAR MR, BEACH L, FERGUSON AT, GROVE G, JOERGENSON EJ. Selection of Patients for Peripheral Arterial OperationsPlethysmo graphic and Clinical Evaluation. Arch Surg. 1965;90(4):606-611. doi:10.1001/archsurg.1965.01320100150022