If your child with spina bifida has a VP shunt, you already know the weight of watching for failure. About 80-90% of children with spina bifida depend on a shunt to manage hydrocephalus, and the question isn't whether you'll face a malfunction, but when and how you'll recognize it.

Shunt failure doesn't always announce itself with the textbook symptoms you were handed at discharge. Some failures present acutely within hours. Others develop gradually over days or weeks, with subtle behavioral shifts that blur into normal childhood variation until they don't.

Here's what you're watching for, and when it's time to act.

Acute Shunt Failure: Hours Matter

Acute failure typically follows a recognizable pattern. It doesn't always start with all symptoms at once, but they tend to cluster and escalate quickly.

The most common early sign is a headache that doesn't respond to the usual relief. Your child may complain of head pain that worsens when lying down or immediately upon waking. In younger children who can't articulate headache, you'll see persistent irritability that's different from their baseline fussiness.

Within 6-12 hours, you'll often see vomiting. This isn't the single vomit that follows a coughing fit or happens once after a meal. It's repeated, forceful, and typically worse in the morning. Nausea that persists through the day without an obvious viral cause is a red flag.

By this point, many children become lethargic or unusually sleepy. They're harder to rouse, less interested in activities that normally engage them, and may seem "checked out" even when awake.

If you're seeing this pattern (headache, vomiting, lethargy), call your neurosurgeon's office immediately. If it's after hours or you can't reach them within 30 minutes, go to the ER. Don't wait to see if it resolves overnight.

Gradual Shunt Failure: The Subtle Shift

Not all shunt failures present as emergencies. Some develop over weeks, with changes so incremental that you question whether you're seeing a real pattern or imagining one.

Behavioral changes are the earliest indicators. Your child may become more irritable, quicker to frustration, or emotionally volatile in ways that feel out of proportion to the trigger. Sleep patterns may shift: difficulty falling asleep, waking frequently, or sleeping significantly more than usual.

Academic performance can decline. Teachers may report that your child is struggling to focus, takes longer to complete familiar tasks, or seems to tire easily during the school day. If your child has an IEP, the team may notice regression in areas where they'd been stable.

Vision changes are another gradual failure sign. Your child may complain that words on the page look blurry, have trouble tracking objects, or develop frequent headaches tied to visual tasks. In some cases, they start tilting their head to see or squinting more often.

Physical coordination may decline subtly. They're clumsier than usual, drop things more frequently, or have trouble with fine motor tasks they'd previously mastered.

If you're tracking two or more of these changes over 7-10 days, document what you're seeing and contact your neurosurgeon. Gradual failure still requires intervention, but it gives you slightly more time to act.

What Parents Often Misread

Shunt failure doesn't always follow the script. Some presentations confuse even experienced clinicians, so it's worth knowing what gets misread.

Fever alone doesn't rule out mechanical failure. Many parents assume that if there's no fever, the shunt is fine and the symptoms are viral. But mechanical obstruction rarely causes fever. Fever suggests infection, which is a separate emergency, but lack of fever doesn't mean the shunt is working.

Headaches that come and go can still indicate failure. Intermittent symptoms, particularly headaches that resolve when your child sits or stands upright, can signal partial obstruction. The shunt may be draining enough in certain positions to relieve pressure temporarily, but not enough to prevent failure.

Normal fontanelle in infants doesn't rule out shunt failure. In babies under 18 months, a bulging fontanelle is a classic sign of increased intracranial pressure. But if the shunt is partially functioning, the fontanelle may look and feel normal even as pressure builds. You can't rely on this single indicator.

Developmental regression isn't always behavioral. If your toddler suddenly stops using words they'd been saying consistently, or your school-age child loses a skill they'd mastered, contact your neurosurgeon the same day. Regression in established skills is a neurological red flag.

When to Call Versus When to Go

You don't need permission to seek care, but it helps to know what's urgent versus what's same-day.

Go to the ER now if your child has:

• Severe headache with vomiting
• Altered consciousness (difficult to wake, confusion, disorientation)
• Seizure activity
• Sudden vision loss or double vision
• Rapid behavioral change (went from normal to unresponsive in hours)

Call the neurosurgeon's office within the hour if your child has:

• Headache that's worsening over several hours
• Repeated vomiting without fever or diarrhea
• Lethargy that's progressing through the day
• Vision changes that developed over 24-48 hours

Schedule a same-day or next-day appointment if your child has:

• Persistent low-grade headache over several days
• Gradual behavioral changes you've been tracking for a week
• Decline in school performance with no other explanation
• Sleep pattern changes lasting more than 5 days

If you're not sure which category your child falls into, err toward the more urgent option. Neurosurgeons would rather clear a functioning shunt than see a child who waited too long.

Tracking Symptoms Across Time

Many shunt failures are easier to spot in retrospect because you can see the pattern. Creating a simple tracking system helps you identify trends before they become crises.

Keep a symptom log on your phone or a small notebook. When your child complains of a headache, note the time, severity (on a 1-10 scale if they can articulate it), what they were doing, and whether anything relieved it. Do the same for vomiting, unusual tiredness, or behavioral shifts.

After two weeks, review your notes. If you're seeing the same complaint three or more times per week, or if symptoms cluster around certain times of day (morning headaches are particularly concerning), bring the log to your neurosurgeon.

This record also helps when you're in the ER at 2 a.m. trying to explain why you're concerned. "He's had a headache" sounds vague. "He's had headaches on waking for six of the past nine days, with vomiting twice, and yesterday he couldn't focus enough to finish his homework" gives the team actionable data.

Building Your Shunt Failure Protocol

Most families develop their own version of a response protocol over time. Having one in place before you need it reduces decision paralysis when symptoms appear.

Know your neurosurgery team's contact path. Write down the office number, the after-hours line, and the name of the nurse or PA who coordinates shunt care. Keep it in your phone contacts and taped to the inside of your medicine cabinet.

Identify your ER. Not all emergency departments have pediatric neurosurgery backup. Know which hospital your neurosurgeon practices at and confirm that's where you'll go if symptoms escalate after hours.

Prep a go-bag. If your child needs imaging or admission, you'll want basics on hand: phone charger, insurance card, list of current medications, and a copy of their most recent shunt series report (your neurosurgeon can provide this). Keep it in your car or by the door.

Talk to school staff. If your child spends significant time at school or with caregivers, make sure those adults know what shunt failure looks like and have your neurosurgeon's contact information. They should know to call you immediately if they see headache, vomiting, or lethargy, not wait to see if it passes.

What Happens After You Report Symptoms

When you contact your neurosurgeon with concerns about shunt failure, the first step is typically imaging. A shunt series (X-rays of the shunt hardware from skull to abdomen) checks for visible disconnection or migration. A CT scan measures ventricle size and compares it to your child's baseline.

If imaging shows increased ventricle size or hardware issues, your child will likely be admitted for shunt revision. This is surgery to replace or repair the malfunctioning component. Most revisions are straightforward and discharge happens within 24-48 hours.

If imaging looks normal but symptoms persist, your neurosurgeon may order a shunt tap (drawing a small sample of cerebrospinal fluid to test pressure and flow). This is done in the office or hospital and helps identify subtle malfunctions that don't show up on imaging.

In some cases, imaging is normal and symptoms resolve on their own. This doesn't mean you were wrong to seek care. Shunt-dependent children can have real symptoms that don't indicate failure: viral illnesses, migraines, and other conditions present similarly. The neurosurgeon would rather rule out failure than miss it.

Living With Shunt Vigilance

The mental load of shunt monitoring doesn't get easier, but it does become routine. You'll learn your child's baseline, and deviations from it become more obvious over time.

Trust your instinct. You know your child better than anyone in the neurosurgery clinic or the ER. If something feels wrong, it's worth investigating. No neurosurgeon has ever faulted a parent for bringing a concern that turned out to be nothing. They've all seen the alternative, and it's always worse.

The goal isn't to eliminate the vigilance, because vigilance is part of managing a shunt-dependent child. The goal is to make it informed, so you're acting on real indicators instead of constant low-level panic.