The patient with chronic obstructive pulmonary disease (COPD) is brought to the post-anesthesia care unit (PACU) after abdominal surgery. Which symptom alerts the nurse to an impending complication?

The patient is brought to the emergency department complaining of sudden onset crushing substernal chest pain. He is pale, diaphoretic, and can only speak in short sentences. His vital signs are notable for a heart rate of 118 bpm, respiratory rate of 22, and a blood pressure of 94/52 mmHg. Upon assessment, peripheral pulses are palpable but weak; lungs are clear; mild jugular venous distention is noted. The emergency medical services administered aspirin on arrival to the scene. The nurse anticipates performing which intervention first? 

The 28-year-old female patient presents complaining of stumbling when walking, tremor, and decreased coordination. The nurse suspects the magnetic resonance imaging (MRI) scan will reveal lesions in which location?