Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/37767
Title: Cardiac Impairment Evaluated by Transesophageal Echocardiography and Invasive Measurements in Rats Undergoing Sinoaortic Denervation
Authors: Sirvente, Raquel A.
Irigoyen, Maria C.
Souza, Leandro E.
Mostarda, Cristiano
La Fuente, Raquel N.
Candido, Georgia O.
Souza, Pamella R. M.
Medeiros, Alessandra [UNIFESP]
Mady, Charles
Salemi, Vera M. C.
Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Issue Date: 14-May-2014
Publisher: Public Library Science
Citation: Plos One. San Francisco: Public Library Science, v. 9, n. 5, 9 p., 2014.
Abstract: Background: Sympathetic hyperactivity may be related to left ventricular (LV) dysfunction and baro- and chemoreflex impairment in hypertension. However, cardiac function, regarding the association of hypertension and baroreflex dysfunction, has not been previously evaluated by transesophageal echocardiography (TEE) using intracardiac echocardiographic catheter.Methods and Results: We evaluated exercise tests, baroreflex sensitivity and cardiovascular autonomic control, cardiac function, and biventricular invasive pressures in rats 10 weeks after sinoaortic denervation (SAD). the rats (n = 32) were divided into 4 groups: 16 Wistar (W) with (n = 8) or without SAD (n = 8) and 16 spontaneously hypertensive rats (SHR) with (n = 8) or without SAD (SHRSAD) (n = 8). Blood pressure (BP) and heart rate (HR) did not change between the groups with or without SAD; however, compared to W, SHR groups had higher BP levels and BP variability was increased. Exercise testing showed that SHR had better functional capacity compared to SAD and SHRSAD. Echocardiography showed left ventricular (LV) concentric hypertrophy; segmental systolic and diastolic biventricular dysfunction; indirect signals of pulmonary arterial hypertension, mostly evident in SHRSAD. the end-diastolic right ventricular (RV) pressure increased in all groups compared to W, and the end-diastolic LV pressure increased in SHR and SHRSAD groups compared to W, and in SHRSAD compared to SAD.Conclusions: Our results suggest that baroreflex dysfunction impairs cardiac function, and increases pulmonary artery pressure, supporting a role for baroreflex dysfunction in the pathogenesis of hypertensive cardiac disease. Moreover, TEE is a useful and feasible noninvasive technique that allows the assessment of cardiac function, particularly RV indices in this model of cardiac disease.
URI: http://repositorio.unifesp.br/handle/11600/37767
ISSN: 1932-6203
Other Identifiers: http://dx.doi.org/10.1371/journal.pone.0087935
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