A patient with an unknown medical problem is responsive to painful stimuli and breathing poorly at a rate of 8 breaths/min. The airway is patent and the skin warm and moist. The patient's radial pulse is strong and irregular. Breath sounds are absent over the bases of the lungs. Vital signs are pulse, 84; blood pressure, 256/120 mmHg; and SpO2, 81%. The best treatment for this patient's breathing difficulty would be:
A) High-concentration oxygen through a nonrebreather mask
B) Continuous positive airway pressure (CPAP)
C) Positive pressure ventilation
D) 2 to 4 liters of oxygen through a nasal cannula
C) Positive pressure ventilation
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