Final answer:
The early sign of impending hydrocephalus for which a nurse should monitor in an infant that had myelomeningocele repair is bulging fontanels, a sign of increased intracranial pressure.
Step-by-step explanation:
A nurse monitoring an infant who has had surgery for myelomeningocele repair should be vigilant for signs of impending hydrocephalus, which is a condition characterized by an excessive accumulation of cerebrospinal fluid (CSF) in the brain.
One early sign of hydrocephalus to watch out for is bulging fontanels, which are the "soft spots" on an infant's head that have not yet been converted to bone. Bulging fontanels may indicate increased intracranial pressure, a symptom of hydrocephalus. Other early signs can include changes in vital signs, difficulties with feeding, irritability, and frequent crying. It is important to address signs of hydrocephalus promptly, as it can lead to serious complications and may require the placement of a shunt to relieve pressure.