Based on the following patient data, which patient would be contraindicated for a high-frequency oscillatory ventilation (HFOV) trial due to their condition? Patient Age Diagnosis Mean Arterial Pressure (MAP) (mm Hg) Blood Gas: pH / PaCO2 (mm Hg) Patient A 60 ARDS 85 7.35 / 45 Patient B 50 COPD 50 7.20 / 70 Patient C 40 Pneumonia 90 7.40 / 40 Patient D 30 Sepsis 65 7.36 / 60

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Patient B. HFOV is contraindicated in patients with severe acidosis (low pH) and hypotension (low MAP). Patient B has a MAP of 50 mm Hg, which is lower than normal, and a pH of 7.20, indicating severe acidosis. These conditions make HFOV unsuitable for Patient B.

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