Atrial Dyssynchrony Measured by Strain Echocardiography as a Marker of Proarrhythmic Remodeling and Oxidative Stress in Cardiac Surgery Patients

• Autores: Sánchez, Francisco Javier; Gonzalez, Valeria A.; Farrando, Martin; Baigorria Jayat, Ariel O.; Segovia Roldan, Margarita; Garciá Mendívil, Laura; Ordovás, Laura; Prado, Natalia Jorgelina; Pueyo, Esther; Diez, Emiliano Raúl
• Año de publicación: 2021
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: ATRIAL DYSSYNCHRONY; STRAIN ECHOCARDIOGRAPHY; OXIDATIVE STRESS; ARRHYTHMIA; CARDIAC SURGERY
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Aging leads to structural and electrophysiological changes that increase the risk of postoperative atrial arrhythmias; however, noninvasive preoperative markers of atrial proarrhythmic conditions are still needed. This study is aimed at assessing whether interatrial dyssynchrony determined using two-dimensional speckle tracking echocardiography relates to proarrhythmic structural and functional remodeling. A cohort of 45 patients in sinus rhythm referred for cardiac surgery was evaluated by echocardiography and surface electrocardiogram the day before the intervention. Transmembrane potential, connexin, and potassium channel distribution, inflammatory, and nitrooxidative markers were measured from right atrial tissue obtained from patients. A difference greater than 40 milliseconds between right and left atrial free wall contraction confirmed the presence of interatrial dyssynchrony in 21 patients. No difference in relation with age, previous diseases, and 2-dimensional echocardiographic findings as well as average values of global longitudinal right and left atrial strain were found between synchronic and dyssynchronic patients. Postoperative atrial fibrillation incidence increased from 8.3% in the synchronic group to 33.3% in the dyssynchronic ones. P wave duration showed no difference between groups. Action potentials from dyssynchronous patients decreased in amplitude, maximal rate of depolarization, and hyperpolarized. Duration at 30% of repolarization increased, being markedly shorter at 90% of repolarization. Only the dyssynchronous group showed early and delayed afterdepolarizations. Atrial tissue of dyssynchronous patients displayed lateralization of connexin 40 and increased connexin 43 expression and accumulation of tumor necrosis factor-α in the intercalated disc. Tumor necrosis factor-α did not colocalize, however, with lateralized connexin 40. Nitroxidative marks and KATP channels increased perivascularly and in myocytes. Our results demonstrate that, as compared to a traditional surface electrocardiogram, the novel noninvasive echocardiographic evaluation of interatrial dyssynchrony provides a better identification of nonaged-related proarrhythmic atrial remodeling with increased susceptibility to postoperative atrial fibrillation.
Fil: Sánchez, Francisco Javier. Universidad Nacional de Cuyo; Argentina. Clínica de Cuyo; Argentina
Fil: Gonzalez, Valeria A.. Gobierno de la Provincia de Mendoza. Hospital Luis Lagomaggiore.; Argentina
Fil: Farrando, Martin. Clínica de Cuyo; Argentina
Fil: Baigorria Jayat, Ariel O.. Clínica de Cuyo; Argentina
Fil: Segovia Roldan, Margarita. Universidad de Zaragoza; España
Fil: Garciá Mendívil, Laura. Universidad de Zaragoza; España
Fil: Ordovás, Laura. Universidad de Zaragoza; España. Fundación Agencia Aragonesa para la Investigación y el Desarrollo; España
Fil: Prado, Natalia Jorgelina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Medicina y Biología Experimental de Cuyo; Argentina
Fil: Pueyo, Esther. Universidad de Zaragoza; España. Consorcio Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina; España
Fil: Diez, Emiliano Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Medicina y Biología Experimental de Cuyo; Argentina