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Averaged sympathetic response during early (VM2e, left panels) and late phase 2 (VM2l, right panel) of the Valsalva maneuver in patients with postural tachycardia syndrome (POTS) and healthy controls (CON). Response are derived from integrated muscle sympathetic activity (iMSNA) and action potential detection on the. raw neurogram (mean and peak spike frequency, and total spike count).
