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- W2146367064 abstract "SUMMARY Chronic pressure overload leads to hypertrophy, depressed mechanical function, and reduced myosin ATPase activity. However, it is not known whether the lowered myosin ATPase activity results from the hypertrophic process per se or whether the elevated afterload is required for the depressed myosin ATPase activity. Further, a causal relationship between lowered myosin ATPase and weakened mechanical function in pressure overload has not been established. Chronic volume overload on the myocardium, leading to hypertrophy equivalent to that in pressure overload, allows the effects of pressure overload to be separated from the effects of hypertrophy and provides insight into the association between myosin ATPase and mechanical function. We produced large atrial septal defects (ASD) with a transvenous biopsy catheter in six adult cats. This resulted in 63% right ventricular hypertrophy, normal (P > 0.05) papillary muscle mechanical function (velocity at 0.5-g/mm 1 load: control - 1.01 ± 0.05 muscle lengths per second; ASD - 1.02 + 0.26 muscle lengths per second), and normal (P > 0.05) myosin ATPase activity in three activating mediums (actin: C - 0.20 ± 0.02, ASD «• 0.21 ± 0.03; Ca 1+ : C - 0.41 ± 0.03, ASD - 0.38 ± 0.02; K-EDTA: C - 1.67 ± 0.05, ASD - 1.69 ± 0.07 pmol" @default.
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- W2146367064 date "1979-07-01" @default.
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- W2146367064 title "Myosin adenosine triphosphatase activity in the volume-overloaded hypertrophied feline right ventricle." @default.
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- W2146367064 doi "https://doi.org/10.1161/01.res.45.1.81" @default.
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