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Relation between left ventricular Doppler parameters during early diastole and age after birth. Left panels are day 0 group and right panels day 1–7 group. X axis (age) is number of hours after birth in the day 0 group and days after birth in the day 1 to 7 group. Y axis is peak mitral early diastolic flow velocity (E) (upper panels), Ew in the mitral annulus (middle panels), and the E:Ew ratio (lower panels).
