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- W2058246572 abstract "To investigate the effects of volume and pressure overloads and myocardial hypertrophy on exercise-induced changes in QRS amplitude, we reviewed treadmill exercise electrocardiograms. In 10 normal young men, Rv5 amplitude decreased and Sv1 amplitude increased at peak exercise, and returned to the resting value in the recovery period. In 10 patients with aortic regurgitation, Rv5 and Sv1 amplitudes increased after 5 min of recovery. In 12 patients with essential hypertension and 10 with idiopathic hypertrophic non-obstructive cardiomyopathy, R&l;tv5> amplitude remained unchanged or higher at peak exercise compared with the resting value, but patterns of serial changes were similar to that of normal subjects. In 9 patients with atrial septal defect. R'v1 amplitude increased with exercise, whereas it remained unchanged in 12 with isolated complete right bundle branch block. In 5 patients with mitral stenosis, Sv1 amplitude decreased at peak exercise. In conclusion, changes in QRS amplitude with exercise are influenced by hemodynamic abnormality and myocardial hypertrophy, and a major determinant of these serial changes seems to be the change in ventricular volume." @default.
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- W2058246572 date "1993-01-01" @default.
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- W2058246572 title "Effects of volume and pressure overloads and myocardial hypertrophy on exercise-induced changes in electrocardiographic QRS amplitude." @default.
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- W2058246572 doi "https://doi.org/10.1253/jcj.57.495" @default.
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