A postpartum mother with a BMI of 35 is day 2 status post cesarean section. You received in report she has had minimal ambulation since her surgery yesterday. The patient uses her call light to ask if the nurse "could come to her room.”. She complains of sudden shortness of breath and chest pain, and her vital signs are as follows: HR: 119, RR: 22, BP: 148/84, Temp: 98.7°F, pain is 8/10. Which nursing action is the most appropriate in response to these findings?