What is the primary nursing intervention for a patient exhibiting signs of acute respiratory distress and suspected impaired gas exchange?

A. Increase ambient humidity in the room: While humidified air can soothe irritated airways, it is not a primary intervention for acute respiratory distress. Humidity does not provide the pressure or oxygen concentration needed to correct a severe gas exchange deficit. It is a comfort measure used for mild upper respiratory symptoms. B. Position the patient in a semi-Fowler's position: Elevating the head and torso to a 30 to 45-degree angle promotes better lung expansion and reduces the work of breathing. This position optimizes the V/Q (ventilation-perfusion) ratio and is the first-line nursing action for any patient struggling to breathe. It provides immediate physiological support. C. Administer analgesics for discomfort: Pain management is important, but it is not the priority when a patient is in respiratory distress. Many analgesics, particularly opioids, can further depress the respiratory drive and worsen the gas exchange deficit. The physical airway and breathing needs must be stabilized before addressing comfort. D. Start IV fluids: Intravenous fluids are used for hydration or blood pressure support but do not directly improve oxygenation or ventilation. If the respiratory distress is due to pulmonary edema, IV fluids could actually worsen the patient's condition. Fluids should only be started after the respiratory status is evaluated and stabilized.