What should the nurse be aware of with regard to the newborn's developing cardiovascular system?

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The newborn's thin chest wall often allows the PMI to be seen.The normal heart rate for infants who are not sleeping is 110 to 160 beats/min.However,a crying infant temporarily could have a heart rate of 180 beats/min.Heart murmurs during the first few days of life have no pathological significance;an irregular heart rate past the first few hours should be evaluated further.Persistent tachycardia may indicate RDS;bradycardia may be a sign of congenital heart blockage.

What Should the Nurse Be Aware of with Regard to the Newborn's