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Figure 1 Acute tilt-table study results. Systolic blood pressure (SBP) (A) and heart rate (HR) (B) in the active treatment arm (continuous line) and control arm (dotted line). Values are expressed as mean ± 1 SE. During the test, some patients had syncope and the test was interrupted; numbers at the top refer to patients free of syncope at that time. (A) Handgrip (HG) started at the onset of impending syncope; compared with placebo, active HG caused a significant increase in SBP, which was already significant after 10 s. (B) Heart rate behavior was similar in the two arms. There was an initial compensatory HR increase, which peaked at the time of impending syncope. *p < 0.05.
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