Dear Dr Devlin,
Since you are a Neurologist, you are very much aware about this syndrome.It's known to cause severe arm pain/shoulder pain and is a known inflammatory condition.It's also called as "Acute Brachial Neuropathy"
So her pain in the arm is consistent with the diagnosis.It's good that the weakness is minimal.
I don't have much idea about the H1N1 association and this syndrome, but since its inflammatory condition, viral association may result is arthtritis/flare up of the condition.
All i can say is that, and i presume you also know, prognosis is good.
Regards....
I had my H1N1 vaccination on Oct. 26, 2009. My arm pain began the next day. The pain is 24/7 and I have limited use of my right arm where the vaccine shot was given. If I accidentally turn my arm quickly in a motion that my arm finds incorrect the pain is totally excruciating - like my arm is being torn from my body. Dressing is difficult as well as most everything. What specifically went wrong and what is the remedy?