A patient with pleural effusion develops respiratory distress after thoracentesis. On examination, on one side of the lung there is absent lung sound with hyper ventilation. What is the most likely complication?

1. A

   Pneumonia

2. B

   Pneumothorax

3. C

   Pleural effusion

4. D

   Atelectasis

Appeared in: NORCET 10 Prelims-2026

Explanation

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• Pneumothorax is the accumulation of air in the pleural space, causing the lung to collapse.
• It is a well-known iatrogenic complication of thoracentesis, where the needle inadvertently punctures the lung.
• The classic signs are sudden respiratory distress, diminished or absent breath sounds on the affected side, and a hyperresonant (tympanitic) note on percussion.
• These signs directly match the patient's presentation in the scenario.

Why Other Options Were Wrong

• Option A: Pneumonia is an infection and would not present with such acute onset immediately after a procedure. Its signs include fever, productive cough, and crackles, not hyperresonance.
• Option C: Pleural effusion was the patient's pre-existing condition. While fluid can re-accumulate, it causes dullness to percussion, not hyperresonance.
• Option D: Atelectasis (alveolar collapse) also causes decreased breath sounds but is characterized by dullness to percussion, not hyperresonance. The trachea may shift toward the affected side.

Related Visual

• Visual 1: Diagram: A side-by-side illustration comparing a normal lung, a lung with pleural effusion, and a lung with pneumothorax, highlighting the location of air/fluid.
• Visual 2: Chest X-ray: An example of a post-thoracentesis pneumothorax, showing the collapsed lung margin and the air-filled pleural space.
• Visual 3: Flowchart: A diagnostic flowchart for acute respiratory distress, using percussion notes (hyperresonant vs. dull) and breath sounds as key decision points.

Clinical Relevance

• Nursing practice connection: Safe nursing care depends on performing Complications of Thoracentesis in the correct sequence, documenting the action clearly, and monitoring for the expected response.
• Recognizing the signs of pneumothorax after thoracentesis is a critical nursing responsibility for patient safety. It is a medical emergency.
• Promptly notifying the provider and preparing for intervention can prevent progression to a tension pneumothorax, which is life-threatening due to cardiovascular collapse.
• What if? If the patient's percussion note was dull instead of hyperresonant, the most likely complication would be a hemothorax (bleeding into the pleural space from a lacerated intercostal artery) or rapid re-accumulation of the effusion.

How to Approach the Question

• First, identify the key elements of the clinical scenario: a patient with a known condition (pleural effusion) undergoes a procedure (thoracentesis).
• Next, focus on the acute change in the patient's status: sudden respiratory distress.
• Analyze the specific physical exam findings provided: absent lung sounds and hyperresonance on one side.
• Correlate the procedure with its known risks. Thoracentesis has a known risk of puncturing the lung.
• Synthesize the findings: The combination of a lung puncture risk, absent breath sounds (collapsed lung), and hyperresonance (air in the pleural space) points directly to pneumothorax.
• Evaluate the other options to confirm they don't fit. Pneumonia, effusion, and atelectasis are all associated with dullness to percussion, ruling them out.

Concept Tested & Keywords

• Concept Tested: Complications of Thoracentesis
• Stem keywords: pleural effusion, thoracentesis, respiratory distress, absent lung sound
• Lead-in keywords: most likely complication
• Clinical cues: The patient's condition changed immediately after an invasive procedure (thoracentesis), pointing to an iatrogenic complication.

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