REVIEW
A review of postural orthostatic tachycardia syndrome
Blood Pressure Unit, Mid Western Regional Hospital, Limerick, Ireland
A 21-year-old female reports an 18-month history of light-headedness on standing. This is often associated with palpitations and a feeling of intense anxiety. She has had two black-outs in the past 12 months. She is not taking any regular medications. Her supine blood pressure was 126/84 mmHg with a heart rate of 76 bpm, and her upright blood pressure was 122/80 mmHg with a heart rate of 114 bpm. A full system examination was otherwise normal. She had a 12-lead electrocardiogram performed which was unremarkable. She was referred for head-up tilt testing. She was symptomatic during the test and lost consciousness at 16 min. Figure 1 summarizes her blood pressure and heart rate response to tilting. A diagnosis of postural orthostatic tachycardia syndrome with overlapping vasovagal syncope was made.
Key Words: Tilt table testing, Clinical features, Pathophysiology, Treatment, Postural orthostatic tachycardia syndrome
* Corresponding author. Tel: +353 61482623, E-mail address: sheila.carew{at}hse.ie
Manuscript submitted 4 July 2008. Accepted after revision 4 November 2008.
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