Key result
A 28-year-old woman diagnosed with postural tachycardia syndrome demonstrated alpha-adrenergic denervation and beta-adrenergic hyperresponsiveness, with symptoms improving after midodrine treatment.
Case Report (n=1)
This case report describes a 28-year-old woman with postural tachycardia syndrome, highlighting alpha adrenergic denervation and beta adrenergic hyperresponsiveness as potential pathophysiologic factors.
Postural tachycardia syndrome is defined as the development of orthostatic symptoms without orthostatic hypotension. We report a 28-year-old female patient with postural tachycardia syndrome who exhibited palpitation, low-grade fever and weight loss. Evaluation of autonomic nervous system functions showed that cardiovagal function was normal. Sweat response to acetylcholine was decreased. Excessive blood pressure elevation was seen in phase IV of the Valsalva maneuver. Pathophysiologic factors in this case were considered to be alpha adrenergic denervation and beta adrenergic hyperresponsiveness. It is important that this syndrome be widely recognized and properly diagnosed.
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Kishi et al. (2001) conducted a case report in Postural Tachycardia Syndrome (n=1). Midodrine hydrochloride was evaluated on Heart rate increase on standing/tilt-up. A 28-year-old woman diagnosed with postural tachycardia syndrome demonstrated alpha-adrenergic denervation and beta-adrenergic hyperresponsiveness, with symptoms improving after midodrine treatment.
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