Presyncopal sympathetic withdrawal is the same in patients with vasodepressor syncope and controls who faint on head-up tilting - 10/09/11
Abstract |
Head-up tilt provokes vasodepressor syncope in patients with this disorder but may also cause fainting in unaffected subjects. The aims of this study were to examine autonomic function and sequential changes in heart rate variability and plasma catecholamines during graded head-up tilt in patients with vasodepressor syncope compared with healthy subjects. Studies were performed in 10 patients and 15 control subjects. Eight negative controls completed the study; presyncope or syncope developed in seven positive controls and all 10 patients. The negative control group showed a progressive increase in mid-frequency from the supine position to end tilt. Patients and positive controls showed significant and similar falls in mid-frequency in the presyncope period. The rise in plasma norepinephrine was blunted in patients and positive controls, whereas plasma epinephrine increased more in these groups compared with the negative control group. In conclusion, the patterns of heart rate variability and catecholamine changes could not be distinguished in patients and positive control subjects. (Am Heart J 1997;133:230-9.)
Le texte complet de cet article est disponible en PDF.Plan
 | Reprint requests: Barry P. McGrath, MD, Department of Medicine, Monash Medical Centre, 246 Clayton Rd., Clayton, Melbourne, Victoria 3168, Australia. |
| 4/1/76861 |
Vol 133 - N° 2
P. 230-239 - février 1997 Retour au numéro
Article précédent
- Transthoracic three-dimensional echocardiographic reconstruction of left and right ventricles: In vitro validation and comparison with magnetic resonance imaging
- Riccardo Pini, Giuseppe Giannazzo, Mauro Di Bari, Francesca Innocenti, Luigi Rega, Giancarlo Casolo, Richard B. Devereux, From the aInstitute of Gerontology and Geriatrics, University of Florence, bDepartment of Radiology, Azienda Ospedaliera Careggi, and cDepartment of Medicine, The New York Hospital–Cornell Medical Center.
- Diagnostic value of exercise electrocardiography and angina after coronary artery stenting
- Victor Legrand, Bruno Raskinet, Gertjan Laarman, Nicolas Danchin, Marie A. Morel, Patrick W. Serruys, On behalf of the Benestent Study Group Liège, Belgium, From the Department of Cardiology, Catheterization Laboratory, Centre Hospitalier Universitaire Sart-Tilman.
Bienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
Déjà abonné à cette revue ?