28 September 2026
: Case report 
Coexisting Postural Orthostatic Tachycardia Syndrome on Autonomic Reflex Testing in Functional Neurologic Disorder
Unusual clinical course, Challenging differential diagnosis
Sushmita Das
AEF 1, Sri Rama Narayana Yerraballa AEF 1, Priyanka Shekhawat AEF 1*
DOI: 10.12659/AJCR.953323
Am J Case Rep 2026; 27:e953323
Figure 3 Conceptual diagram illustrating overlapping symptoms and distinguishing diagnostic features of functional neurologic disorder (FND) and postural orthostatic tachycardia syndrome (POTS). The central overlap highlights shared clinical manifestations while the outer sections depict condition-specific diagnostic signs and pathophysiologic mechanisms.