Full-term infant noted to have persistent tachycardia

Case

Hi, I’m calling to let you know about a newborn infant that is full-term but transferred to the NICU because of a persistent tachycardia that was noted after delivery. The heart rate seems to remain high regardless of what the baby is doing. The baby seems stable to me, but the heart rate is definitely higher than I would expect. We have an ECG of it but, I have to admit, it’s a bit hard for me to interpret.