Reversible sympathetic vasomotor dysfunction in POTS patients

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Freitas, J (Author) FMUP; Santos, R (Author) Other; Elsa Azevedo (Author) Other; Ovídio Costa (Author) FMUP; Carvalho, M (Author) Other; Falcao de Freitas, A (Author) Other

Journal

Title: Revista Portuguesa de Cardiologia

Vol. 19 No. 3

Pages: 1163-1170

ISSN: 0870-2551

Publisher: Sociedade Portuguesa De Cardiologia

Indexing

Scopus - 8 Citations

Other information

Authenticus ID: P-007-9BP

Abstract (EN): Background: Orthostatic intolerance refers to the development upon assuming an upright posture of disabling symptoms, which are partly relieved by resuming the supine position. Postural tachycardia syndrome (POTS) is an orthostatic intolerance syndrome characterized by palpitations due to excessive orthostatic sinus tachycardia, lightheadedness, tremor, and near-syncope. Patients usually undergo extensive medical, cardiac, endocrine, neurological and psychiatric evaluation, which usually fails to identify a specific abnormality. We investigated the autonomic and hemodynamic profile of POTS patients and the efficacy of bisoprolol and or fludrocortisone. Methods and Results: We evaluated eleven female patients with POTS before and after medical treatment with a cardio-selective beta blocker (bisoprolol) and/or fludrocortisone, and eleven age-matched controls. Variability of heart rate and systolic blood pressure was assessed by Fast Fourier Transform, and spontaneous baroreceptor gain by temporal sequences slope and ¿ index. Modelflow was used to quantify hemodynamics. All patients improved greatly after medication. The autonomic and hemodynamic impairment observed in patients with POTS, particularly after orthostatic stress, is treated effectively with bisoprolol and/or fludrocortisone. These results need further confirmation in a controlled double-blind study. Conclusions: Proper medical treatment dramatically improves the clinical and autonomic/hemodynamic disturbances observed in patients with POTS. The data support the hypothesis that POTS is due to a hyperadrenergic activation and/or hypovolemia during orthostasis.

Language: English

Type (Professor's evaluation): Scientific