Figure 7.

a) Data from 15 533 separate Sphygmocor reports in 1604 different subjects/patients, showing the relationship between estimated aortic systolic pressure (ordinate mmHg), and brachial artery systolic pressure, determined by conventional cuff sphygmomanometry (abscissa). b) Relationship between estimated aortic systolic pressure (ordinate) and directly measured radial artery systolic pressure (abscissa) for 80 observations under different conditions in 35 patients studied at surgery prior to initiation of cardiopulmonary bypass. c) Relationship between estimated aortic systolic pressure (ordinate) and simultaneously measured aortic systolic pressure (abscissa) for data shown in centre panel. For all, dotted line is line of identity, solid line is regression line.