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Figure 2 A case of handgrip (HG) tilting. The top trace shows the heart rate (HR) curve; the bottom trace shows systolic, diastolic, and mean blood pressure (BP) curves. Symptoms of impending syncope occurred when systolic BP fell to 80 mm Hg with an abrupt drop in HR from 95 beats/min to 65 beats/min. During treatment, BP progressively increased and symptoms disappeared. The vagal bradycardic reflex was also quickly interrupted, and HR rose in an oscillatory manner to baseline values. During the recovery phase, systolic BP decreased but remained at values higher than before and symptoms did not recur.