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LVOT ACC (m/s 2) = Vmax (m/s)/ACT (s). When systolic function is normal, the LV ejection curve resembles a sharp-angled triangle. With impaired left ventricular function, the ejection curve becomes flattened and rounded, i.e., with a decreased peak velocity and an increased ACT.Systolic heart failure, also called heart failure with reduced ejection fraction, occurs when your left ventricle can’t pump blood efficiently. It’s a serious condition and can cause damage to other organs. Treatment addresses any underlying causes, such as coronary artery disease or hypertension, along with lifestyle changes.