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• W1996695846 abstract "Background Reduced subendocardial coronary reserve is a hallmark of left ventricular hypertrophy (LVH). The goal of this study was to determine whether hemodynamic, as opposed to structural, mechanisms were responsible for the reduced subendocardial coronary reserve. Methods and Results The effects of near-maximal vasodilation with adenosine were examined in 10 conscious dogs with LVH (79% increase in ratio of LV weight to body weight) induced by aortic banding in puppies with and without preload reduction. At baseline, LV end-diastolic pressure, LV end-diastolic circumferential and compressive radial wall stresses, and LV myocardial blood flow were similar in dogs with LVH and sham-operated controls, while LV end-systolic circumferential wall stress tended to be greater in the LVH group compared with the control group. In control dogs, adenosine reduced LV circumferential end-systolic and end-diastolic wall stresses and compressive radial subendocardial wall stress; LV subendocardial blood flow increased (from 1.41±0.16 to 3.58±0.27 mL · min −1 · g −1 ) and the ratio of subendocardial to subepicardial blood flow decreased from 1.30±0.07 to 0.69±0.05. In dogs with LVH, during adenosine infusion, LV circumferential end-systolic and end-diastolic wall stresses and LV radial subendocardial wall stresses remained elevated, the increase in LV subendocardial blood flow was significantly smaller (from 1.11±0.11 to 2.27±0.24 mL · min −1 · g −1 , P <.05), and the subendocardial/epicardial ratio fell to a lower level (from 1.22±0.17 to 0.35±0.03, P <.05). When LV wall stresses during adenosine were reduced in a subgroup of 5 dogs with LVH, the endocardium/epicardium ratio during adenosine infusion was no longer different from that in control dogs (0.63±0.11), nor was the level of subendocardial blood flow different (3.42±0.60 mL · min −1 · g −1 ). Conclusions These data suggest that hemodynamic factors, eg, compressive forces, are an important component of the reduced subendocardial coronary reserve as opposed to structural alterations, even in the presence of severe LVH." @default.
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• W1996695846 date "1995-08-15" @default.
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• W1996695846 title "Hemodynamic Mechanisms Responsible for Reduced Subendocardial Coronary Reserve in Dogs With Severe Left Ventricular Hypertrophy" @default.
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• W1996695846 doi "https://doi.org/10.1161/01.cir.92.4.978" @default.
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