Which of the following is a clinical symptom most commonly associated with Acute Respiratory Distress Syndrome (ARDS)?

Choice A reason: Hypercapnia with respiratory alkalosis is not typical in ARDS. ARDS primarily causes severe hypoxemia due to alveolar damage and impaired gas exchange. Hypercapnia (elevated CO2) may occur in advanced respiratory failure, but respiratory alkalosis is more associated with hyperventilation in early stress responses, not ARDS’s hallmark of refractory hypoxemia.

Choice B reason: Pulmonary hypertension can develop in ARDS due to hypoxic vasoconstriction and vascular remodeling from inflammation, but it is not the primary or most common symptom. ARDS is characterized by diffuse alveolar damage leading to severe hypoxemia, with pulmonary hypertension being a secondary complication rather than the defining clinical feature.

Choice C reason: Severe hypoxemia despite supplemental oxygen is the hallmark of ARDS. It results from alveolar flooding, surfactant loss, and ventilation-perfusion mismatch, impairing oxygen diffusion. Even high-flow oxygen fails to correct low PaO2 due to shunting and non-functional alveoli, making this the most common and critical symptom requiring urgent intervention.

Choice D reason: Pleural effusion is not a primary feature of ARDS. It may occur in conditions like heart failure or infection but is less common in ARDS, which primarily involves alveolar edema and inflammation. The dominant clinical issue in ARDS is severe hypoxemia due to impaired gas exchange, not fluid accumulation in the pleural space.

Choice A reason: Starting an IV infusion of lactated Ringer’s supports fluid status and may be needed for anticoagulation administration in pulmonary embolism. However, it does not address the immediate hypoxemia caused by the embolism’s ventilation-perfusion mismatch. Oxygen therapy is the priority to correct low oxygen levels and prevent tissue hypoxia.

Choice B reason: Morphine IV may relieve pain and anxiety in pulmonary embolism, reducing oxygen demand. However, it does not directly address hypoxemia, the primary life-threatening issue. The ABCDE approach prioritizes breathing, making oxygen therapy the first intervention to stabilize the patient before pain management is considered.

Choice C reason: Pulmonary embolism causes a ventilation-perfusion mismatch, reducing oxygen delivery to the blood, leading to hypoxemia. Administering oxygen therapy immediately increases alveolar oxygen, improving arterial PaO2 and preventing tissue hypoxia. In the ABCDE approach, breathing is prioritized, making oxygen therapy the first intervention to stabilize the client.

Choice D reason: Cardiac monitoring assesses for arrhythmias or right heart strain in pulmonary embolism, which is important for ongoing management. However, it does not correct the immediate threat of hypoxemia. Oxygen therapy addresses the critical reduction in oxygen saturation, taking precedence in the ABCDE approach over monitoring in acute management.