Words matter in HIE, and one distinction that can easily disappear in conversations about outcomes is the difference between:
No identified disability and Mild disability or mild impacts. They are not interchangeable.
Clinical trials need clearly defined outcomes.
Historically, HIE research has frequently focused on major outcomes such as death, cerebral palsy, significant cognitive impairment or moderate-to-severe disability.
That's understandable when answering questions such as whether a treatment like therapeutic hypothermia works.
The landmark NICHD therapeutic hypothermia trial and its school-age follow-up, for example, evaluated outcomes including death, IQ and moderate or severe disability.
The TOBY school-age follow-up used survival with an IQ score of 85 or higher as its primary outcome and also examined neurological abnormalities and disability.
These definitions allow researchers to compare treatment groups consistently, but the categories we use for research don't always translate neatly into the lived experience of families, and many times families weren't consulted on the study design, or outcomes measured that actually matter to them.
A child who doesn't meet a research definition of moderate or severe disability may still have very real needs.
There is no single mild HIE outcome definition.
Depending on the individual child, mild impacts may involve:
Another child might have several of these, another may have none. And some of these impacts are not apparent in the NICU or even during toddlerhood.
Imagine two children who both avoid a study's definition of “moderate/severe disability.” One needs no therapies or educational support, the other receives occupational and speech therapy, takes medication for epilepsy, has an IEP and receives support for executive functioning.
Calling both children simply “unimpaired” doesn't tell families very much.
This is one reason Hope for HIE advocates for outcome measures that better reflect the things children and families actually experience, why we are developing a community-centered research agenda, and bring lived experience from our community into study design.
Research following children with HIE into school age makes this distinction especially clear.
Despite the absence of CP, the children with a history of HIE had differences in cognitive and motor performance and more emotional and behavioral difficulties compared with matched peers.
And 34% needed additional school support compared with 5% of controls.
If our only outcome question had been “Does this child have cerebral palsy?” we would have missed much of the story.
A review of cognitive outcomes in later childhood and adolescence similarly describes potential differences involving intellectual function, memory, attention, executive functioning and behavior among children with a history of neonatal HIE, including children without major motor disability.
The goal isn't to label every difference as disability: it's to describe outcomes accurately enough that children can receive appropriate support.
Some families and individuals identify strongly with disability, others describe their child's needs differently.
What shouldn't happen is for research terminology to erase a child's support needs simply because they don't meet a threshold for a more severe outcome category. This is inaccurate, and can have unintended consequences, like delays in identification and building support.
When clinicians say “Your baby has a good chance of a favorable outcome,” families may understandably hear “My baby will have no impacts from HIE.”
Those aren't necessarily the same statement.
A better conversation explains what the outcome definition actually measures.
Those details matter.
No disability and mild disability are distinct outcomes.
Recognizing that difference doesn't diminish how well children with mild impacts may be doing, it simply tells the truth about their experience, and better definitions help us build better research, better counseling and better systems of support.
Explore our HIE Outcomes resource for a deeper look at how HIE outcomes are defined, measured and understood across childhood.
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