Introduction
Postural orthostatic tachycardia syndrome (PoTS) can be defined simply as a persistent tachycardia, with or without hypotension in the upright posture,1 with symptoms of orthostatic intolerance.2 Diagnosis varies depending on each centre, and may include the three-minute sit-to-stand test, 10-minute lie-to-stand test and/or tilt-table testing. A persistent heart rate rise of 30 or greater in the context of eliciting symptoms of orthostatic intolerance is usually considered diagnostic. It was officially recognised in 1993, but had previously existed under other names including soldier’s heart, Da Costa syndrome, irritable heart
