Left ventricular sphericity index predicts systolic dysfunction in rats with experimental aortic regurgitation.
Although an increased left ventricular (LV) diastolic diameter (DD) and a decreased ejection fraction have been used as markers for the surgical replacement of an insufficient aortic valve, these signals may be observed when irreversible myocardium damage has already occurred. The aim of this study was to determine whether change in LV geometry predicts systolic dysfunction in experimental aortic regurgitation. Male Wistar rats underwent surgical acute aorta regurgitation (aorta regurgitation group; n = 23) or a sham operation (sham group; n = 12). After the procedure, serial transthoracic echocardiograms were performed at 1, 4, 8, and 16 wk. At the end of protocol, the LV, lungs, and liver were dissected and weighed. During the follow-up, no animal developed overt heart failure. There was a correlation between the LV sphericity index and reduced fractional shortening (P < 0.001) over time. A multiple regression model showed that the LVDD-sphericity index association at 8 wk was a better predictor of decreased fractional shortening at week 16 (R(2) = 0.50; P < 0.001) than was the LVDD alone (R(2) = 0.39; P = 0.001). LV geometry associated with increased LVDD improved the prediction of systolic dysfunction in experimental aortic regurgitation.
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil meliza10@hotmail.com.
Meliza Goi
MG
Roscani
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Bertha Fulan
BF
Polegato
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Suzana Erico Tanni
SE
Minamoto
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Ana Paula Mena
AP
Lousada
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Marcos
M
Minicucci
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Paula
P
Azevedo
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Luiz Shiguero
LS
Matsubara
Department of Internal Medicine, Botucatu Medical School, University of Estadual Paulista (Universidade Estadual Paulista "Júlio de Mesquita Filho"), São Paulo, Brazil.
Beatriz Bojikian
BB
Matsubara
D000818:Animals; D001022:Aortic Valve Insufficiency / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D004452:Echocardiography / Q000379:methods*; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008297:Male; D009929:Organ Size; D051381:Rats; D017208:Rats, Wistar; D013599:Systole; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology*
eccentric hypertrophy; echocardiogram; heart failure; valve disease; volume overload