[Effect of preloading on myocardial pumping and contraction in patients with acquired heart defects].
D000328:Adult; D001022:Aortic Valve Insufficiency / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000601:surgery*; D009200:Myocardial Contraction
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