In pediatric deformity surgery, intraoperative neuromonitoring (IONM) is your spinal cord’s early warning system — part smoke alarm, part guardian angel. But when the alarms sound, what actually works to fix the problem?
A massive new series looked at 5,317 consecutive pediatric deformity surgeries performed between 1992 and 2024 to answer exactly that. The result is one of the largest real-world looks at IONM alerts and what happens after the beep.
And perhaps the most important lesson? Sometimes the spinal cord just wants…better blood pressure.
How often do alerts actually happen?
Out of more than 5,300 cases, 223 patients (4.2%) experienced at least one IONM alert.
That’s roughly 1 in 24 cases — frequent enough to keep you honest, but rare enough that every alert still gets everyone’s attention.
The alerts spanned the typical pediatric deformity spectrum: kyphosis (66), idiopathic scoliosis (63), neuromuscular deformity (43), congenital deformity (24), syndromic (11) and other diagnoses (16).
In total, the team recorded 237 alerts that triggered 348 corrective interventions. When the spinal cord complains, surgeons and anesthesiologists don’t sit still.
When do alerts happen?
The most common moment for alarms was the one you would all expect: During or immediately after deformity correction.
This makes intuitive sense. Correction maneuvers can temporarily alter spinal cord perfusion, tension, or both. The cord may simply be saying: "Hey…that was a bit aggressive."
But the key question isn’t when alerts happen.
It’s what to do next.
The Two Most Common Fixes
Among all interventions, two responses dominated: fix the blood pressure (n = 91) and adjust or reduce the deformity correction (n = 63).
Yes — hypotension was the single most common reversible culprit.
This reinforces something many experienced deformity surgeons already suspect: when signals drop, the spinal cord often isn’t asking for a philosophical debate about alignment strategy. It’s asking for perfusion. Raise the mean arterial pressure and the cord frequently says: "Thanks, I’m good now."
Did the signals come back?
In 156 patients, neuromonitoring signals recovered intraoperatively after intervention. In 67 patients, they did not. But the story doesn’t end there.
At wake-up, 29 patients showed neurologic change from baseline. That’s concerning — but the long-term picture is far more reassuring.
Among patients with documented follow-up: 21 had full neurologic recovery, 5 had partial recovery and 3 had no recovery.
The Big Picture: Risk Reduction in Action
Without intervention, the authors estimate that spinal cord dysfunction during alerts might have approached the initial alert rate of 4.2%. Instead, outcomes improved dramatically.
| Stage | Neurologic Deficit Rate |
| During alerts | 4.20% |
| At wake-up | 0.50% |
| Final exam | 0.15% |
That’s 8 deficits out of 5,312 cases. For context, that’s roughly 1.5 per 1,000 cases. Not perfect — but a powerful demonstration of how early detection plus rapid response protects the spinal cord.
Why This Study Matters
This series isn’t just big — it’s practically useful.
It reinforces three important principles for deformity surgeons:
- Alerts are uncommon but not rare. Expect them, plan for them, and rehearse your response.
- Blood pressure matters. A lot. Normotension — especially during correction — may be the single most important modifiable factor.
- A systematic response protocol works. Check anesthesia. Raise mean arterial pressure. Reverse correction if needed. Evaluate instrumentation. Stay calm and methodical.
The spinal cord is surprisingly forgiving when treated quickly.
The Takeaway for Surgeons
The next time the neuromonitoring tech says, “Signals are dropping,” remember: Before removing implants, revising rods, or questioning your entire surgical plan…Look at the MAP.
Because sometimes the spinal cord isn’t protesting the correction. It’s just asking for better circulation. And when you listen quickly enough, it usually forgives you.
Origin Study Title: Analysis of 5317 Consecutive Pediatric Spinal Deformity Intraoperative Neuromonitoring (IONM) Alerts Importance of Normotension at Correction and IONM Recovery
Authors: Bozorgmehr, Christopher K. B.S.; Rakers, Leah M.B.A., CNIM; Kelly, Brian M.D.; Luhmann, Scott J. M.D.