Question

Emergency medical services bring a 68-year-old woman to the acute care bay for evaluation of severe difficulty breathing. Her husband, who accompanies her, reports a medical history significant for severe emphysema. He notes she has suffered from a progressively worsening productive cough over the preceding four days. On initial evaluation, the patient is profoundly somnolent and opens her eyes only in response to a vigorous sternal rub. She demonstrates marked intercostal retractions with shallow, rapid breathing. Current vital signs are temperature $37.9^\circ\text{C}$ ($100.2^\circ\text{F}$), pulse $124/\text{min}$, respirations $32/\text{min}$, and blood pressure $162/94\text{ mm Hg}$. Oxygen saturation is $76\%$ on room air. Thoracic auscultation reveals globally diminished air entry and faint expiratory wheezing. Which of the following represents the most urgent initial step in this patient's care?