You are working in the emergency department when M. C., an 82-year-old widow, arrives by ambulance. Because M. C. had not answered her phone since noon yesterday, her daughter went to her home to checkon her. She found M. C lying on the kitchen floor, incontinent of urine and stool, with complaints of pain in her right hip. Her daughter reports a past medical history of hypertension, angina, and osteoporosis. M. C. takes propranolol (Inderal), a nitroglycerin patch, indapamide (Lozol), and conjugated estrogen (Premarin) daily. M. C.'s daughter reports that her mother is normally very alert and lives independently. On examination, you see an elderly woman, approximately 100 pounds, holding her right thigh. you note shortening of the right leg with external rotation and a large amount of swelling at the proximal thigh and right hip. M. C. is oriented to person only and is confused about place and time, but she is able to say that her "leg hurts so bad." M. C.'s vital signs (VS) are 90/65, 120, 24, 97.5° F (36.4° C); her Spo2 is 89%. She is profoundly dehydrated. Preliminary diagnosis is a fracture of the right hip. Considering her medical history and that she has been without her medications for at least 24 hours, explain her current VS.