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Head Injury

Author: Ashleigh Lawrence-Ball / Codes: PMP4 / Published: 12/09/2018

Walk into any Emergency Department in the country and you are bound to find at least one child waiting to be seen with a head injury – it’s one of the commonest presenting complaints to EDs in the UK. Approximately 295000 children under the age of 16 will be seen each year (which is why we decided to have an induction blog on it).

Thankfully, the majority of paediatric head injuries are trivial, but 10% will be classed as moderate to severe. Head injuries account for 30% of traumatic childhood deaths in the UK. The most common causes of moderate to severe head injuries in childhood are falls (in infants) and road traffic collisions (in older children).

Children have several anatomical and physiological difference to adults that make them more likely to sustain head injuries and more complex to assess. In this blog, we’ll go through those differences, talk about the assessment of the child with a head injury and then discuss the treatment of these children, depending of the severity of their head injury.

General principals for assessing children:

Remember that children in hospital are often scared and upset, and don’t forget their parents (who will also be scared and upset). Children often regress a stage when they present to hospital, so getting the parents onside is really important. Be calm, be friendly and make sure both the parents and child know what you’re going to do before you do it. Assessment of the unwell or injured child often involve things that look unpleasant to the outside world (for example, assessing for a pain response), and it’s very easy to lose the trust of parents or carers if you’re not careful.

Most of the children you will assess will have a minor head injury. Remember proportionality – falling a long way for a child is not the same as for an adult, and vice versa. If a toddler falls their own height – it’s not really a long way. And toddlers will fall their own height A LOT, they are fast and nosy.

The way they fall is also different, due to proportionality. A toddler does not fall down stairs in the same way as adults, in that they don’t fall down in one projectile movement, but tumble downstairs, meaning they have a collection of small falls, reducing the mechanism of injury (MOI).

You will also have to innovate, extrapolate and economise how you assess them – “head, shoulders, knees and toes” is a great way to assess most of their motor function!

If the child has presented with a head injury as part of a major trauma remember your (C) ABCDE and work systematically. You should always have plenty for friends around to help as part of the major trauma team.

If the child is awake and the parents are present, make sure the child can see them. If the situation allows, let the parent hold the child’s hand and offer as much reassurance as possible they will be the best at calming their child down. If the parent is too distressed, or the acuity of the situation means they need to stand away from the bed, assign a member of staff to keep talking to them and keep them calm as this frees you up to deal with the medical side of things.

Why children are not little adults:

Children with have a few important anatomical differences to remember when you see them the ED. Here’s a quick run down of what you need to know – for the longer version, check out this blog post we released a while ago.

  • Their heads are proportionally bigger to the rest of their bodies than adults, this means it more likely to get injured in a trauma.
  • The subarachnoid space in thinner, meaning there is less “cushioning” during any impact.
  • The cranial sutures don’t fully close until 12-18 months, so in young children there’s an increased tolerance for expanding intracranial contents (e.g. haematomas, oedema), which can go unrecognised. Check the fontanelles in all young children presenting with a head injury.
  • The unfused cranial sutures also mean a large volume of blood can collect intracranially, leading to hypovolaemic shock.
  • Young children can have up to twice the cerebral blood flow of an adult, making them more susceptible to secondary brain injury, particularly due to hypoxia.
  • Children are more likely to vomit following a head injury, regardless of their intracranial pressure, and this is reflected in the NICE CT scanning criteria, which we’ll address later.

GCS assessment of children:

As you can imagine, GCS assessment of children, particularly those who are pre-verbal is tricky. You can use an AVPU score as a general guide, but the NICE criteria work off of a formal GCS. Below is a table for grading a young child’s GCS. For children over 4, you can use the adult GCS.

Age <4:

Eye opening:
-Spontaneous 4
-To verbal stimuli 3
-To pain 2
-None 1
Best motor response (if pre-verbal, use best grimace response):
-Spontaneous / obeys command 6
-Localises to pain or withdraws to touch 5
-Withdraws from pain 4
-Abnormal flexion to pain (decorticate) 3
-Abnormal extension to pain (decerebrate) 2
-No response 1
Best verbal response:
-Alert, babbles and coos words to normal ability 5
-Less than usual words, spontaneously irritable cry 4
-Cries only to pain 3
-Moans to pain 2
-No response 1

Best grimace response for pre-verbal children:

Spontaneous normal facial or oromotor activity 5
Less than usual spontaneous activity or only responsive to touch 4
Vigorous grimace to pain 3
Mild grimace to pain 2
No response to pain 1

NICE CT criteria for children:

Like adults, NICE have very particular criteria for performing a CT scan in children with a head injury, and we generally base our assessment of these children off of those criteria.

Children who need an immediate scan:

  • Suspicion of non-accidental injury (well talk a bit more later)
  • Post traumatic seizure, but no history of epilepsy
  • Initial GCS <14 if over 1 year or <15 if under 1 year
  • GCS at 2 hours <15
  • Suspected open or depressed skull injury
  • Tense fontanelle
  • Any sign of a basal skull fracture (haemotympanum, ‘panda’ eyes, CSF leak from ears or nose, Battle’s sign)
  • Focal neurological deficit
  • If <1 year, a bruise, laceration or swelling of more than 5cm on the head

Additional “Risk factors”

  • Witnessed loss of consciousness >5 minutes
  • Abnormal drowsiness
  • 3 or more discrete episodes of vomiting
  • Dangerous mechanism (high speed RTC, fall from >3m, high speed injury from an object)
  • Amnesia (antegrade or retrograde) lasting >5 minutes (children older than 5)

If one risk is present, children need observation for at least 4 hours post head injury

If there is more than one risk factor present, children need an immediate CT scan

If children are taking warfarin (or another anti-coagulant) they should have a CT scan within 8 hours of injury.

A word on vomiting:

A lot of children vomit after a head injury. We don’t know why and there has been a fair bit of research into the significance of isolated vomitingin children following a head injury, which suggests that the likelihood of a significant intracranial injury is unlikely. However, my advice would be to always follow the guidelines and discuss with a senior when unsure.

Make sure you take a good history from the parents when it comes to any vomiting as children will often retch and vomit several times in quick session. This would be classed as one discrete episode, rather than several separate ones. Giving analgesia and anti-emetic to help with this is generally considered a good thing to do.

Don’t forget the C-Spine:

As with adults, you should always consider a concurrent C-spine injury in all children presenting with a head injury, although the incidence is low. NICE have a full set of criteria regarding imaging selection, but essentially, if the child has a significantly reduced GCS or neurology they should have an immediate CT scan of their neck. If they have pain with a dangerous mechanism but normal neurology, they should have plain films. We have a blog on Paediatric trauma imaging which covers this here.

Safeguarding issues:

Unfortunately, there will be a proportion of children who present with head injury who will have a Non-Accidental Injury (NAI). We have a duty of care to all children and you should consider the possibility of NAI in all children you see. We have a whole blog on safeguarding in this iBook, but for head injuries making sure the mechanism of injury meets the child’s milestones is imperative!

Treating and discharging childhood head injuries in the ED:

The aim in managing those with a moderate or severe head injury is about limiting secondary brain injury. Children should be treated using the same principals as adults: maintain normothermia, normocapnia and normoglycaemia. Nurse with a 30 degree head up tilt and avoid hard collars if a C-Spine injury can’t be ruled out, as they can prevent venous drainage, increasing ICP further. Neurosurgical intervention in children with traumatic brain injury is rare but paediatric trauma centre referral is mandated.

Lots of children with a head injury will have a wound of some description. Superficial grazes can be cleaned and left alone. Small, superficial lacerations can often be glued but some will need sutures. Depending on the age of the child, you may be able to do it in the department, either with subcutaneous local anaesthetic, or if you dont think they’ll tolerate multiple injections, you can consider a topical local anaesthetic (for example LAT gel). Ultimately, some children, especially those who are very young won’t tolerate awake closure of the wound and will need referral for closure under general anaesthetic.

Thankfully, the vast majority of children will go home straight from the ED. They should be discharged with written head injury advice which should include information on when to return and who to contact for advice, and, don’t forget to give them a sticker on the way out!

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