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• W2083403784 startingPage "1128" @default.
• W2083403784 abstract "Heart failure (HF) with normal ejection fraction (diastolic HF [DHF]) usually occurs in elderly patients with hypertension. The presence and significance of altered systolic and diastolic ventricular function in DHF is increasingly controversial. Our objective was to develop a clinically relevant large-animal model to better understand the pathophysiology of DHF.Ventricular structure and function were characterized in young control (YC group; n=6), old control (OC group; n=7), and old dogs made hypertensive by renal wrapping (experimental DHF [ExDHF] group; n=8). The ExDHF group was associated with normal left ventricular (LV) volume, increased LV mass, and myocardial fibrosis. LV relaxation was impaired in ExDHF (tau=53+/-6 ms) compared with OC (tau=35+/-3 ms; P<0.05) and YC (tau=33+/-6 ms; P<0.05) dogs. The percent diastole at which relaxation is complete was increased in ExDHF (116+/-30%) compared with OC (69+/-8%; P<0.05) and YC (35+/-5%; P<0.05) dogs. The coefficient of LV diastolic stiffness was similar in OC, YC, and ExDHF dogs. Diastolic pressures increased dramatically in response to increases in blood pressure. End-systolic LV stiffness was enhanced in ExDHF dogs and after load enhancement of myocardial performance was maintained. Arterial stiffness was increased in ExDHF dogs.Aged dogs with chronic hypertension exhibit LV hypertrophy and fibrosis with impaired LV relaxation but no increase in the coefficient of LV diastolic stiffness. LV systolic and arterial stiffness are increased, which may exacerbate load-dependent impairment of relaxation and contribute to increased filling pressures with hypertensive episodes. This model mimics many of the structural and functional characteristics described in the limited studies of human DHF and provides insight into the pathogenesis of DHF." @default.
• W2083403784 created "2016-06-24" @default.
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• W2083403784 date "2005-03-08" @default.
• W2083403784 modified "2023-10-15" @default.
• W2083403784 title "Ventricular Structure and Function in Aged Dogs With Renal Hypertension" @default.
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• W2083403784 doi "https://doi.org/10.1161/01.cir.0000157183.21404.63" @default.
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