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Figure 1: The cardiac ultrasound. (a) Left heart function measurement: EF = 70%, FS = 40%. (b) Color Doppler ultrasound: large blood vessel level and continuous left-to-right shunt, Vmax = 4.4 m/s. (c and d) Two-dimensional and M-mode ultrasound: the left heart was enlarged; left atrium = 43 mm, left ventricular = 61 mm. (e) Pulmonary artery-widening to 31 mm. (f) The PDA with an inner diameter of about 8 mm

Figure 1: The cardiac ultrasound. (a) Left heart function measurement: EF = 70%, FS = 40%. (b) Color Doppler ultrasound: large blood vessel level and continuous left-to-right shunt, Vmax = 4.4 m/s. (c and d) Two-dimensional and M-mode ultrasound: the left heart was enlarged; left atrium = 43 mm, left ventricular = 61 mm. (e) Pulmonary artery-widening to 31 mm. (f) The PDA with an inner diameter of about 8 mm