A nurse is caring for an infant who has hydrocephalus and ventriculoperitoneal shunt malfunction. Which of the following assessment findings indicates that the infant is experiencing increased intracranial pressure?

This scenario involves evaluating neurological deterioration in an infant with a shunt malfunction. Knowledge of pediatric neuroanatomy and the physiological effects of cerebrospinal fluid accumulation is required to identify clinical signs of elevated intracranial pressure, distinguishing them from normal infant behaviors. Choice A rationale High intracranial pressure causes cerebral irritation and decreased oxygenation of brain tissue. This results in persistent, high-pitched crying and irritability in infants because they cannot communicate physical discomfort or headache. This is a primary early indicator. Choice B rationale Increased pressure within the cranial vault typically triggers the vomiting center in the brainstem, leading to poor feeding or projectile vomiting. An increased appetite is not associated with this pathology; instead, anorexia or lethargy occurs. Choice C rationale In infants, the cranial sutures are not yet fused. Increased intracranial pressure forces the fontanels to bulge outward and feel tense or firm. A flat fontanel is a normal finding and suggests stable intracranial volume. Choice D rationale The Cushing reflex is a late sign of increased intracranial pressure, characterized by bradycardia rather than tachycardia. As pressure rises, the heart rate slows significantly to compensate for systemic hypertension meant to maintain cerebral perfusion.