NCLEX Review Guide: Pediatric Hydrocephalus

Definition and Mechanism

• Hydrocephalus is characterized by an abnormal accumulation of cerebrospinal fluid (CSF) within the ventricles of the brain, leading to increased intracranial pressure. This condition occurs when there is an imbalance between CSF production and absorption, or when there is obstruction to CSF flow within the ventricular system.
• The normal CSF circulation pathway includes: production by choroid plexus in ventricles → flows through lateral ventricles → third ventricle → aqueduct of Sylvius → fourth ventricle → exits through foramina of Luschka and Magendie → circulates in subarachnoid space → absorbed by arachnoid villi into venous system.

Classification of Hydrocephalus

Signs and Symptoms by Age Group

• Infants: Rapidly increasing head circumference (crossing percentile lines on growth charts), bulging fontanelles, "setting sun" sign (downward deviation of eyes with visible sclera above iris), separated cranial sutures, prominent scalp veins, high-pitched cry, irritability, poor feeding, vomiting, and lethargy.
• Older children: Headache (worse in morning or with position changes), nausea and vomiting, diplopia (double vision), papilledema, ataxia, behavioral changes, decreased school performance, and altered consciousness.

Assessment Findings

• Macrocephaly: Abnormally large head size, with head circumference greater than the 98th percentile for age and gender or crossing two major percentile lines on growth charts within a short period.
• Cushing's triad: In severe cases with significant increased intracranial pressure, may observe hypertension, bradycardia, and irregular respirations – a late and ominous sign requiring immediate intervention.
• Developmental delays may be present, particularly in gross motor skills due to the weight and size of the head making it difficult for infants to achieve milestones like head control and sitting.

Imaging Studies

• Cranial Ultrasound: Often used in neonates with open fontanelles; can visualize ventricular size and detect intraventricular hemorrhage. Advantages include bedside availability, no radiation exposure, and no sedation requirement.
• CT Scan: Provides detailed images of ventricular size and potential causes of obstruction. Commonly used in emergency situations due to rapid acquisition time.
• MRI: Gold standard for detailed evaluation of brain anatomy, CSF flow dynamics, and identifying underlying causes such as tumors or congenital malformations. Provides superior tissue contrast compared to CT but requires longer scanning time and often sedation in young children.

Additional Diagnostic Tests

• Lumbar Puncture: May be contraindicated in cases of increased intracranial pressure due to risk of brain herniation. When performed safely, can measure CSF pressure and analyze CSF composition to identify infections or other abnormalities.
• Developmental Assessment: Comprehensive evaluation of motor, cognitive, and social development to establish baseline functioning and identify areas of delay requiring intervention.

Surgical Interventions

• Ventriculoperitoneal (VP) Shunt: The most common surgical treatment involving placement of a catheter system that diverts CSF from the ventricles to the peritoneal cavity where it is absorbed. Components include a ventricular catheter, a valve system to regulate flow, and a distal catheter.
• Endoscopic Third Ventriculostomy (ETV): Creation of an opening in the floor of the third ventricle to allow CSF to bypass an obstruction, particularly useful in obstructive hydrocephalus. Advantages include avoiding shunt-related complications, but not appropriate for all types of hydrocephalus.
• Choroid Plexus Cauterization: Sometimes performed in conjunction with ETV to reduce CSF production by cauterizing the choroid plexus tissue.

Shunt Complications

• Shunt Malfunction: May occur due to obstruction, disconnection, or mechanical failure of components. Signs include return of hydrocephalus symptoms, with headache, vomiting, lethargy, and altered mental status.
• Shunt Infection: Typically occurs within the first few months after placement. Presents with fever, erythema along shunt tract, abdominal pain, irritability, and sometimes signs of meningitis. Most commonly caused by skin flora, particularly Staphylococcus epidermidis.
• Overdrainage: Excessive CSF drainage causing ventricular collapse, subdural hematomas, or slit ventricle syndrome. Symptoms include positional headaches (worse when upright, better when lying down).

Preoperative Nursing Care

• Perform thorough neurological assessment, documenting baseline level of consciousness, pupillary response, motor function, and vital signs.
• Monitor head circumference in infants and document fontanelle characteristics (bulging, flat, sunken).
• Maintain proper positioning with head elevated 15-30 degrees to minimize intracranial pressure.
• Provide family education regarding the surgical procedure, expected outcomes, and postoperative care.

Postoperative Nursing Care

1. Monitor neurological status frequently, including level of consciousness, pupillary response, and motor function.
2. Assess vital signs, noting any signs of Cushing's triad which could indicate increased intracranial pressure.
3. Maintain the head position as prescribed by the neurosurgeon (typically flat or slightly elevated).
4. Monitor surgical sites for signs of infection, CSF leakage, or excessive swelling.
5. Assess pain level and administer analgesics as ordered.
6. Monitor intake and output to ensure adequate hydration.
7. Observe for signs of shunt malfunction or overdrainage.

Family Education

• Teach parents/caregivers about signs and symptoms of shunt malfunction or infection that require immediate medical attention: fever, vomiting, headache, irritability, lethargy, seizures, or changes in level of consciousness.
• Provide guidance on wound care, activity restrictions, and follow-up appointments.
• Explain the importance of regular follow-up with neurosurgery, developmental specialists, and other healthcare providers.
• Discuss developmental considerations and connect families with early intervention services as needed.

Developmental Outcomes

• Developmental outcomes vary widely depending on the cause of hydrocephalus, timing of intervention, complications, and associated conditions.
• Children may experience challenges with fine and gross motor skills, visual-perceptual abilities, attention, memory, and executive functioning.
• Early intervention services including physical therapy, occupational therapy, and speech therapy can significantly improve outcomes.

Educational Considerations

• Children with hydrocephalus may qualify for an Individualized Education Program (IEP) or 504 Plan to address learning needs in the school setting.
• Common educational challenges include difficulties with processing speed, working memory, visual-spatial skills, and mathematics.
• Accommodations might include extended time for assignments and tests, reduced homework, use of assistive technology, and preferential seating.

• Hydrocephalus is an abnormal accumulation of CSF within the ventricles of the brain, leading to increased intracranial pressure.
• Classification includes communicating vs. non-communicating and congenital vs. acquired types.
• Clinical manifestations differ by age: infants show increased head circumference, bulging fontanelles, and "setting sun" sign; older children experience headaches, vomiting, and vision changes.
• Diagnostic evaluation includes imaging (ultrasound, CT, MRI) and developmental assessment.
• Primary treatment is surgical, with VP shunts being most common, followed by ETV for appropriate candidates.
• Major complications include shunt malfunction, infection, and overdrainage, all requiring prompt medical attention.
• Nursing care focuses on neurological assessment, monitoring for complications, and family education.
• Long-term management involves multidisciplinary care, developmental services, and educational support.

Hydrocephalus vs. Macrocephaly

VP Shunt vs. ETV

Common Pitfalls in Nursing Care

• Pitfall: Failing to recognize subtle signs of shunt malfunction in a child with known hydrocephalus.
• Correction: Any change from baseline, especially headache, vomiting, or lethargy, should prompt immediate evaluation in a child with a shunt.
• Pitfall: Improper positioning of infants after shunt placement.
• Correction: Follow neurosurgeon's specific instructions; typically avoid pressure on the shunt valve and reservoir.
• Pitfall: Focusing only on neurological aspects while neglecting developmental needs.
• Correction: Incorporate developmental assessment and early intervention referrals into care planning.

NCLEX Application

• Focus on priority assessments for a child with suspected or known hydrocephalus.
• Know the emergency signs of increased intracranial pressure and shunt malfunction.
• Understand appropriate nursing interventions for pre- and post-operative care.
• Be familiar with family education priorities, especially recognition of complications.

Knowledge Checkpoints