The Arrhythmic Substrate for Atrial Fibrillation in Patients with Mitral Regurgitation.

Autor: R Schill M; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA., S Cuculich P; Department of Medicine, Cardiovascular Division, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8086, St. Louis, MO 63110, USA., M Andrews C; Department of Biomedical Engineering, Washington University in St. Louis; 1 Brookings Dr., Campus Box 1097, St. Louis MO 63130, USA., Vijayakumar R; Department of Biomedical Engineering, Washington University in St. Louis; 1 Brookings Dr., Campus Box 1097, St. Louis MO 63130, USA., Ruaengsri C; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA., C Henn M; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA., S Lancaster T; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA., J Melby S; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA., B Schuessler R; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA.; Department of Biomedical Engineering, Washington University in St. Louis; 1 Brookings Dr., Campus Box 1097, St. Louis MO 63130, USA., Rudy Y; Department of Medicine, Cardiovascular Division, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8086, St. Louis, MO 63110, USA.; Department of Biomedical Engineering, Washington University in St. Louis; 1 Brookings Dr., Campus Box 1097, St. Louis MO 63130, USA., J Damiano R; Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis; 660 S. Euclid Ave., Campus Box 8234, St. Louis, MO 63110, USA.
Jazyk: angličtina
Zdroj: Journal of atrial fibrillation [J Atr Fibrillation] 2020 Aug 31; Vol. 13 (2), pp. 2304. Date of Electronic Publication: 2020 Aug 31 (Print Publication: 2020).
DOI: 10.4022/jafib.2304
Abstrakt: Objective: Patients with severe mitral regurgitation commonly develop atrial fibrillation. The precise mechanisms of this relationship remain unknown. The objective of this study was to apply noninvasive electrocardiographic imaging of the atria during sinus rhythm to identify changes in atrial electrophysiology that may contribute to development of atrial fibrillation in patients with severe mitral regurgitation referred for mitral valve surgery.
Methods: Twenty subjects (9 atrial fibrillation and mitral regurgitation, 11 mitral regurgitation alone) underwent electrocardiographic imaging. Biatrial electrophysiology was imaged with activation maps in sinus rhythm. The reconstructed unipolar electrograms were analyzed for voltage amplitude, number of deflections and conduction heterogeneity. In subjects with mitral regurgitation, left atrial biopsies were obtained at the time of surgery. Results: Subjects with history of atrial fibrillation demonstrated prolonged left atrial conduction times (110±25 ms vs. mitral regurgitation alone (85±21), p=0.025); right atrial conduction times were unaffected. Variable patterns of conduction slowing were imaged in the left atria of most subjects, but those with prior history of atrial fibrillation had more complex patterns of conduction slowing or unidirectional block. The presence of atrial fibrillation was not associated with the extent of fibrosis in atrial biopsies.
Conclusions: Detailed changes in sinus rhythm atrial electrophysiology can be imaged noninvasively and can be used to assess the impact and evolution of atrial fibrillation on atrial conduction properties in patients with mitral regurgitation. If replicated in larger studies, electrocardiographic imaging may identify patients with mitral regurgitation at risk for atrial fibrillation and could be used to guide treatment strategies.
Databáze: MEDLINE
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