Okay so this explains it a bit but I am still confused. If the preliminary test couldn't be done wouldn't that be an answer in itself?
No, because it creates doubt.
The peripheral nerve tests isn’t actually required, but one of the preliminary tests. It’s indicated if there are concerns that the sedation or paralysing agents commonly used to intubate or maintain intimation are still on board. Hollie actually latched onto this early - they wanted to do this day 3 or so but she maintained that he was still sedated.
the motor test is withdrawal to pain, the peripheral nerve test doesn’t Look for movement, it checks that there is an electrical impulse when a nerve is stimulated with an electrode.
Peripheral motor nerves communicate with muscles and enable them to move. If the peripheral nerves are damaged the muscles can’t move. If you severed the motor nerve in your thumb you would want it to move, but it won’t. You can imagine a scenario where someone is paralysed but aware but can’t move because they are paralysed, not because their brain isn’t working
I don’t know whether it’s routine for this hospital to do this test first, or whether they did because of the scrutiny. The “rules” are to do if you think someone still might be under the influence of sedating/paralysing drugs, so 5 half loves (not long).
In reality, when they actually did it, Archie’s brain was rotting, liquid, dropping off etc so it’s part of a wider clinical picture.
In practice, sometimes not all of the brain stem tests are able to be done with patients but the ancillary tests are down frequently such as MRIs, EEGs, blood flow tests and generally families just accept what they are shown.
A pp posted something from a neonatologist saying the test was invalidated because Archie had a spinal injury, but, depending on the level of the lesion, there should still be a peripheral nerve response above the lesion. Plus, Archie didnt have a spinal cord injury. That was scanned for on admission. His spine rotted, but later when his brain was rotting.
Moral of the story is that if they felt like they needed to do this test first, they waited too long