Final answer:
A nurse should report clear drainage from the incision, bulging fontanelle, or increased urine output in an infant post-VP shunt operation, as they may signal complications.
Step-by-step explanation:
The nurse should report to the provider if an infant with hydrocephalus who is postoperative following the placement of a ventriculoperitoneal (VP) shunt exhibits clear drainage from the incision site, a bulging fontanelle, or increased urine output. These findings could indicate potential complications such as infection or problems with the shunt function, including underdraining or overdraining, which could lead to increased pressure on the brain or other serious issues. A decreased irritability can be considered a positive sign indicating a reduction in symptoms due to the successful implantation of the shunt.