Review Question - QID 213469

A 45-year-old man presents to the emergency department with weakness. He states that it started yesterday and has been progressively worsening. Initially, he noticed blurry vision and some trouble speaking and swallowing but thought he was just coming down with a cold. He then noticed weakness of his facial muscles and shortness of breath. The patient works as a farmer and harvests and cans his own foods. He has had diarrhea recently and a cough prior to these symptoms of weakness. His temperature is 97.9°F (36.6°C), blood pressure is 144/94 mmHg, pulse is 87/min, respirations are 18/min, and oxygen saturation is 94% on room air. Physical exam is notable for a man who seems unable to smile with dysarthric speech. He takes shallow and weak breaths on pulmonary exam. The patient demonstrates 3/5 strength with diminished reflexes in his upper extremities. The patient is subsequently intubated. Which of the following is the best treatment for this patient?