Problems with the Diagnostics of Postural Orthostatic Tachycardia Syndrome. Case Studies

Objective of the Review: To demonstrate the complexity in diagnosing postural orthostatic tachycardia syndrome. Key Points. Clinical manifestations of postural orthostatic tachycardia syndrome vary and can have a clinical phenotype that is similar to a number of neurological and somatic conditions. Conclusion. The case studies presented demonstrate the significance of diagnostic manoeuvres in differentiating this syndrome from other types of impairment of consciousness. An active test in standing position which is easy to conduct can be a diagnostic prompt, if it is verified with a history of typical chronic orthostatic intolerability, postural heart acceleration, and a variety of accompanying complaints. Keywords: postural orthostatic tachycardia syndrome, loss of consciousness, diagnostics.