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• W2007456923 abstract "1. The role of haemodynamic changes in left ventricular remodelling has been poorly investigated, especially in the context of volume overload cardiac hypertrophy. Low diastolic blood pressure and high left ventricular filling pressure are expected to affect coronary driving pressure negatively and thereby put in jeopardy subendocardial perfusion in particular. The consequences to global left ventricular remodelling remain undetermined. The aim of the present study was to investigate the role of coronary driving pressure in the development of subendocardial remodelling and the conceivable effects on cardiac function, using a rat model of aortocaval fistula. 2. Wistar rats, weighing 330-350 g, were submitted to aortocaval fistula (ACF group) or sham (control group) operations. Two haemodynamic measurements were determined following surgery, the initial measurement at week 1 and the final measurement at week 8. Cytokine expression, myeloperoxidase (MPO) activity, metalloproteinase expression and activity and fibrosis were assessed in two distinct left ventricular myocardial layers: the subendocardium (SE) and the non-subendocardium (non-SE). 3. The ACF group showed lower initial and final coronary driving pressure and lower final +dP/dt and -dP/dt compared with the control group. Multivariate analyses disclosed initial coronary driving pressure as the only haemodynamic parameter independently associated with SE fibrosis (R(2) = 0.76; P < 0.0001) and with +dP/dt (R(2) = 0.55; P = 0.0004) and -dP/dt (R(2) = 0.91; P < 0.0001). Matrix metalloproteinase (MMP)-2 expression and activity predominated in the SE of ACF animals, particularly in those with low coronary driving pressure. Increased levels of interleukin (IL)-6 and IL-1beta also predominated in the SE of the ACF group. Otherwise, MPO activity and levels of tumour necrosis factor-alpha and IL-10 were similar in both groups. Final coronary driving pressure correlated with both the expression and activity of MMP-2. 4. Low coronary driving pressure early in the course of ACF determines SE damage and, by this mechanism, interferes negatively in left ventricular function." @default.
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• W2007456923 date "2007-08-15" @default.
• W2007456923 modified "2023-10-10" @default.
• W2007456923 title "LOW CORONARY DRIVING PRESSURE IS ASSOCIATED WITH SUBENDOCARDIAL REMODELLING AND LEFT VENTRICULAR DYSFUNCTION IN AORTOCAVAL FISTULA" @default.
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• W2007456923 doi "https://doi.org/10.1111/j.1440-1681.2007.04689.x" @default.
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