After undergoing a bilateral total mastectomy with a free TRAM breast reconstruction, Rachel Poole, a 20-year-old woman diagnosed with stage II breast cancer, is extubated by the anesthesia provider. However, upon extubation, her vital signs show a significant drop. Which of the following vital signs is NOT within the normal range for Ms. Poole?
1) Blood pressure of 70/30 mmHg
2) Pulse rate of 45 bpm
3) Respiratory rate of 8/min
4) Oxygen saturation of 70%