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Europace 2006 8(5):349-351; doi:10.1093/europace/eul024
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© The European Society of Cardiology 2006. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

ATRIAL FIBRILLATION

Parasympathetic-mediated atrial fibrillation during tilt test associated with increased baroreflex sensitivity

Renata Rodrigues Teixeira de Castro1, Evandro Tinoco Mesquita1,2 and Antonio Claudio Lucas da Nobrega1,2,3,*

1 Laboratory of Autonomic and Cardiovascular Reactivity, Syncope Unit and Emergency Department, Hospital Pró-Cardíaco/PROCEP, Rio de Janeiro, RJ, Brazil; 2 Post-Graduate Program in Cardiovascular Sciences, Universidade Federal Fluminense, Niterói, RJ, Brazil; 3 Department of Physiology and Pharmacology, Universidade Federal Fluminense, Niterói, RJ, Brazil

The autonomic mechanism that triggered atrial fibrillation in a patient during tilt test was investigated. Neurocardiogenic syncope is often characterized by diminished baroreflex sensitivity during the hypotension period. Increased barorereflex sensitivity preceding the onset of atrial fibrillation in tilt testing may indicate the involvement of a vagally mediated mechanism, as shown in the present case.

Key Words: Syncope, Atrial fibrillation, Tilt table test, Autonomic nervous system, Baroreflex sensitivity

* Corresponding author: Rua Cinco de Julho, 318/1001, Icaraí, Niterói, Rio de Janeiro, Brazil. Tel: +55 21 8201 0008; fax: +55 21 2629 2405. E-mail address: anobrega{at}urbi.com.br


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Developed in collaboration with, European Heart Rhythm Association (EHRA), Heart Failure Association (HFA), and Heart Rhythm Society (HRS), Endorsed by the following societies, European Society of Emergency Medicine (EuSEM), European Federation of Internal Medicine (EFIM), European Union Geriatric Medicine Society (EUGMS), American Geriatrics Society (AGS), European Neurological Society (ENS), et al.
Guidelines for the diagnosis and management of syncope (version 2009): The Task Force for the Diagnosis and Management of Syncope of the European Society of Cardiology (ESC)
Eur. Heart J., November 1, 2009; 30(21): 2631 - 2671.
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