Click on image to view larger version.

Figure 5 Changes in EP after PROP. In the ISP independent group, EP showed a significant increase (A). In the ISP-dependent group, PROP responders had a mean 2.2-fold increase in EP levels at 15 min of tilting. Two PROP nonresponders showed a marked increase (29.2- and 11.7-fold) in EP levels (arrow) (B).