A 58-year-old male presents with confusion, right-sided weakness, and slurred speech. Your initial impression is that the patient is having a stroke. The patient's wife is present and she is very upset. As your partner is applying oxygen, which of the following has a direct impact on how this patient will be treated once he is taken to the ER?
A) The patient's blood pressure
B) The patient's oxygen saturation
C) The patient's medical history
D) The patient's level of consciousness
