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- W2026030753 abstract "In 15 open-chest, anesthetized dogs, regional systolic wall thickening (% delta WT) was measured with sonomicrometry and regional blood flow was determined with tracer microspheres (7-10 micron) before and after various degrees of coronary artery narrowing were created with a hydraulic occluder. The stenoses were categorized into four groups by the effect on % delta WT, and the corresponding myocardial blood flow (MBF) was determined in four layers across the ventricular wall (layer 1: subendocardium; layer 4: subepicardium). In group 1, % delta WT decreased 44 +/- 10% and only layer 1 MBF was significantly reduced (-28%); in group 2, % delta WT decreased 77 +/- 8% and MBF was reduced in both layers 1 and 2 (-52% and -36%, respectively); in group 3, % delta WT decreased 104 +/- 3% and MBF was reduced in the three inner layers (layer 1: -65%; layer 2: -58%; layer 3: -34%); in group 4, % delta WT decreased 145 +/- 9% (systolic wall thinning) and transmural reduction of MBF was found (layer 1: -74%; layer 2: -68%; layer 3: -55%; layer 4: -29%). We conclude that (1) up to 75% reduction in systolic wall thickening may occur when perfusion to only the inner one-half of the myocardium is decreased; (2) akinetic wall motion may be observed when perfusion remains normal in the subepicardial one-fourth of the wall; and (3) dyskinesia (wall thinning) occurs when blood flow is reduced transmurally." @default.
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- W2026030753 date "1980-12-01" @default.
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- W2026030753 title "Significance of regional wall thickening abnormalities relative to transmural myocardial perfusion in anesthetized dogs." @default.
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- W2026030753 doi "https://doi.org/10.1161/01.cir.62.6.1266" @default.
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