
This study aimed to compare concentrations of autoantibodies to cardiovascular G protein-coupled receptors between patients with POTS and healthy controls. Autoantibody concentrations against all of the receptors tested were not significantly different between controls and patients with POTS. The majority of patients with POTS (98.3%) and all controls (100%) had α1 adrenergic receptor autoantibody concentrations above the seropositive threshold provided by the manufacturer (7 units/mL). The proportion of patients with POTS versus healthy controls who fell above the diagnostic thresholds was not different for any tested autoantibodies. These findings suggest that these tests do not help establish the role of autoimmunity in POTS.
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