a mother has called 911 because her 6-year-old son told her he had chest pain. on scene, the mother informs you that her son suffers from a congenital heart defect called aortic coarctation. the boy admits to chest pain and appears distressed. his airway is patent, breathing adequate, and radial pulse present and regular. vital signs are pulse, 108; respirations, 24 breaths/min; blood pressure, 148/92 mmhg; and spo2, 98%. your next action would be to: