Question #1: A 56 year old man with known ALS presents to A&E having become increasingly short of breath over the last few weeks. His breathing is now so bad that he cannot get dressed without getting of breath. What acid-base abnormality on arterial blood gas best fits this presentation?

Question #2: A 30 year old man presents with a 1 week history of weakness, which started in his feet and has now progressed to include both of his legs. On exam he has a flaccid paraparesis, absent knee and ankle jerks and equivocal plantars. Which of the following are the most likely constellation of CSF findings?

Question #3: Which of the following antibodies is most often present in Myasthenia Gravis?

Question #4: What is the mechanism of pyridostigmine?

Question #5: Which of the following infectious agents is most commonly identified as a trigger of Guillan-Barre Syndrome?