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... en in surprise.
Lu Chen nodded, "I took a bedside ultrasound to see that the velocity of the left ventricular outflow tract increased, and I suspected outflow tract obstruction."
"But we did a cardiac ultrasound a few days ago, and there was no report that the left ventricular outflow was obstructed?" Zhang Liang was still a little unconvinced.
Professional sonographers, using professional machines, did not see it.
Lu Chen used a portable ultrasound machine, ...
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