S532 Prospective Evaluation of Gastrointestinal Symptoms and Health-Related Quality of Life in Patients With Postural Orthostatic Tachycardia Syndrome Using Validated Surveys. (October 2021) - Abboud, Ibrahim; Abboud, Yazan; Hiramoto, Brent; Modi, Rusha; DeLeve, Laurie D.; Taneja, Sonia; Dodge, Jennifer L.; Soffer, Edy; Shaker, Anisa