Anurse is assisting a patient with ambulation. the patient becomes short of breath and begins to complain of sharp chest pain. which action by the nurse is the first priority? a. call for the emergency response team to bring the defibrillator. b. have the patient sit down in the nearest chair. c. return the patient to the room and apply 100% oxygen. d. ask a coworker to get the electrocardiogram (ecg) machine stat.