EMCrit Wee – More on C-Spine Imaging

If you want to understand this post you probably need to listen to the episode on c-spine imaging approach and the follow-up regarding the evidence behind it.

 

Mike Wells from Scotland Writes:

Hi Scott,

Your two excellent podcasts on C spine imaging really got me thinking.
I work in the UK where resource constraints within our public
healthcare system mean that even if I wanted to, I would not be able
to obtain CTs as the first imaging port of call for all my neck trauma
patients. I can however argue individual cases with the radiology
department and therefore effectively need to try to choose high risk
patients.

I pulled the Canadian C spine and NEXUS studies and looked back
through their methodology and results. In both studies ordering a neck
CT was at the discretion of the treating physicians – but most
patients only got plain C spine films (in CCspine 436 patients got CTs
= 7% of total patients who were imaged; for NEXUS I could find data to
allow me to make this calculation). I also went through the further
NEXUS study looking at missed fractures – another way of looking at
their data is that in the 581 patients with technically adequate C
spine films, only 3 unstable fractures were missed – giving a
sensitivity of 99.4% for the unstable injuries which I am most scared
of missing.

I absolutely agree with you though that very often plain films are
technically inadequate and that their sensitivity is therefore much
lower.

However I would argue that the real sensitivity we are interested in
is not that of C spine films alone, but rather than the sensitivity of
the combination of plain C spine films and clinical examination and
acumen. CTs in the NEXUS and Canadian studies were after all ordered
at clinician discretion. It’s possible that fractures were missed in
the patients who weren’t scanned but both studies did seem to attempt
follow up (NEXUS in particular checked local ‘event logs’ although I’m
not clear on what these are).

So I think over here in the NHS I would argue that in ‘minor’ trauma
patients failing the CCspine rule I am still obliged to use plain C
spine films as my first imaging step. On the basis of what you have
said I’ll will set the bar higher in terms of making sure films are
technically adequate (over here we still use Swimmer’s views, which I
detest). However for patients with adequate films and the roughly 3%
prevalence of fractures in the group failing Canadian C spine, I would
hope that my clinical exam would then identify those patients with
normal films but underlying injuries.

Utimately I think from my view what this is about is not the
sensitivity of plain films on their own – which I agree is
unacceptably low – but about the sensitivity of plain films + clinical
skills.

Please feel free to put this in your comments section if you wish!

Thanks again for your fantastic podcast and blog.

Best wishes

Mike Wells

Here is my response to Mike and the others who voiced similar questions about what to do when CT is not easily obtained…

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Comments

  1. Hi Scott.
    I spent my first 4 years post fellowship in a town with no CT, lots of young guys on speed with fast cars and necks like rugby players!
    Long story short = lots of c spine injuries with impossible plain films!
    Here is how we played it – if you had a good mechanism, any midline pain, distracting injury, or are not cooperative – then you got flown out strapped to a spine board. I often passed on plain films as they just didn’t change the plan. Expensive – yes. Inconvenient- sure. But….
    This is a scenario where the potential injury is life long disabiliy and not worth the risk to the patient – no bravado from the doc is indicated!!
    Casey

  2. Patients get CT scans of the cervical spine (and head) at our ER for anything. One patient I saw got a cervical (and head) CT after hitting her head on an LCD TV; another patient literally slid out of a wheelchair and got the same diagnostic workup.

  3. “slid out of her wheelchair”

    Did she already have a spinal injury?

    It’s interesting to compare Casey and drrjv’s situations – one get’s a CT at the drop of a hat…the other has to make difficult decisions necessitating transfers of hundreds of kilometres.

    Great debate

Trackbacks

  1. […] Emcrit podcasts (Part 1, Part 2 and a Wee) on this topic are superb but this chat opens up a whole new can of […]

  2. […] EMCrit Wee – More on C-Spine Imaging – Scott answers a readers question on what to do when CT neck is not easily obtainable. […]

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