Abstract
T HE clinical diagnosis of coarctation of the aorta can be made without difficulty when there is enough constriction of the aorta to cause collateral circulation to become well established. However, the degree of constriction may vary from a slight indentation to practically complete obliteration. The site of coarctation may also vary and anomalies of the great vessels may be present. Therefore, it is advantageous to establish the site and degree of the constriction in order to decide whether or not the condition can be corrected surgically and whether operation is likely to be hazardous. The purpose of this report is to present the combination of two well established methods for the study of blood flow and blood pressure, namely, photo-electric plethysmography and direct measurements of arterial blood pressure as an aid to the diagnosis and location of coarctation of the aorta. By these means the relative blood flow of peripheral parts can be estimated and accurate blood pressure in an extremity can be measured.
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