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Relationship between the presence of an O2-pulse plateau and severity of ischaemia. Relationship between the presence of an oxygen-pulse plateau and (A) DSE score, (B) FFR, and (C) iFR. Data are presented as mean with error bars indicating standard error values. DSE, Dobutamine stress echocardiography; FFR, fractional flow reserve; iFR, instantaneous wave-free ratio; and O2, oxygen. P values were calculated from the regression model which was adjusted for age, weight, height, and sex.
