What is the most common cause of ventriculomegaly in newborns?
Which of the following is the main factor for the ductal closure postnatally?
In fetal circulation, which vessel carries deoxygenated blood back to the placenta?
A 6-year-old child presents to the emergency department with a heart rate of 260 beats/min. A 12-lead ECG confirms a regular, narrow-complex tachycardia without visible P waves. The patient is hemodynamically stable with normal blood pressure. What is the most appropriate initial pharmacologic therapy?
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