Which of the following is the preferred position for a patient with Acute Respiratory Distress Syndrome (ARDS) to improve oxygenation?

1. A

   Supine position

2. B

   Prone position

3. C

   Trendelenburg position

4. D

   Left side-lying position

Appeared in: RML 2023

Explanation

• Prone positioning is considered a first-line therapy for patients with severe Acute Respiratory Distress Syndrome (ARDS).
• This position improves oxygenation by reopening collapsed alveoli (recruitment) in the dependent dorsal (posterior) lung fields.
• It enhances ventilation-perfusion (V/Q) ratios by shifting blood flow to the now better-ventilated regions of the lungs.
• Studies have shown that placing patients with ARDS in the prone position for extended periods (e.g., up to 16 hours a day) can improve oxygenation and decrease mortality.

Why Other Options Were Wrong

• Option A: In the supine position, the weight of the heart and abdominal contents compresses the posterior lung bases, leading to atelectasis (alveolar collapse) and worsening the ventilation-perfusion mismatch.
• Option C: The Trendelenburg position involves tilting the bed so the head is lower than the feet. This increases pressure on the diaphragm from abdominal organs, which restricts lung expansion and worsens respiratory distress.
• Option D: ARDS is a bilateral lung injury. While lateral positioning can be beneficial in unilateral (one-sided) lung disease by placing the 'good lung down' to improve V/Q matching, it is not the primary or most effective strategy for the diffuse injury seen in ARDS.

Related Visual

Clinical Relevance

• Nursing practice connection: Use the key finding related to Therapeutic positioning for patients with Acute Respiratory Distress Syndrome (ARDS) to guide bedside assessment, documentation, and the next nursing action.
• Prone positioning is a critical, evidence-based intervention that can improve survival in patients with severe ARDS and is a key competency for critical care nurses.
• Turning a critically ill, ventilated patient is a high-risk procedure. It requires a coordinated team (often 3-4+ staff members) and a clear protocol to prevent complications like accidental extubation, loss of vascular access, or hemodynamic instability.
• Nurses are responsible for protecting the patient's skin from pressure injuries, especially on the face, chest, and knees, during prolonged prone therapy.

How to Approach the Question

• First, identify the patient's diagnosis: Acute Respiratory Distress Syndrome (ARDS).
• Recall the core pathophysiology of ARDS: diffuse inflammation, fluid-filled alveoli, and significant atelectasis (collapse), especially in the dependent (posterior, when supine) lung regions.
• The question asks for the position that improves oxygenation. This requires an intervention that directly counteracts the pathophysiology.
• Evaluate each option's effect on the lungs. Supine and Trendelenburg positions increase compression on the lungs or diaphragm, worsening the condition.
• The prone position physically moves the heart and abdominal organs away from the large posterior lung fields, allowing them to re-expand and participate in gas exchange.
• Therefore, the prone position is the logical and evidence-based choice to improve ventilation and perfusion in ARDS.

Concept Tested & Keywords

• Concept Tested: Therapeutic positioning for patients with Acute Respiratory Distress Syndrome (ARDS).
• Stem keywords: Acute Respiratory Distress Syndrome (ARDS), preferred position, improve oxygenation
• Lead-in keywords: Which of the following

Question ID

Qh7YCmDUKR2H76sStYC_jy

Copy ID

Reference Book

E6 Nursing Fundamentals Potter Perry 12e Part 4 p. 155-157