You are on the scene of a 50-year-old male who lacerated his arm on a sheet of plate glass. he is pale, diaphoretic, and mumbling incoherently. you have controlled an arterial bleed with direct pressure. his blood pressure is 70/40, pulse 120, and respiratory rate of 28. which of the following signs is the most concerning?
a. altered mental status
b. tachycardia
c. blood pressure
d. respiratory rate