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Peak systolic longitudinal strain and dyssynchrony. In normal controls (A), asymptomatic left ventricular diastolic dysfunction (LVDD) patients (B), heart failure with preserved ejection fraction (HFpEF) patients (C), and heart failure with reduced ejection fraction (HFrEF) (D). The peak longitudinal strain was decreased gradually from each group while the systolic dyssynchrony was increased.
