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Figure 2 (A) Changes in maximum systolic blood pressure dP/dT during tilt sequence. In the HUT+ group, max systolic blood pressure dP/dT decreased significantly at the mid-tilt interval and during syncope. *p < 0.0171, for mid-tilt vs. early-tilt; #p < 0.0001, faint vs. mid-tilt. (B) Changes in electrical-mechanical activation time during the tilt sequence. The electrical-mechanical interval gradually prolonged during the tilt sequence in the HUT+ group, reaching statistical significance at the time of the faint. *p = 0.0016, for faint vs. mid-tilt. For both A and B, the solid line shows data from the HUT+ group and the dashed line for the HUT– group. HUT = head up tilt.
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