A nurse is caring for a 65-year-old patient with COPD on mechanical ventilation who suddenly develops respiratory distress with decreased oxygen saturation, asynchronous breathing patterns, and decreased chest rise on the right side. The ventilator alarm is sounding, and the patient appears agitated. What is the nurse's priority action?
The nurse notices the patient fighting the ventilator with asynchronous breathing patterns and decreased chest rise on the right side.
1Increase the FiO2 setting on the ventilator immediately
2Administer prescribed sedation to reduce patient agitation
3Disconnect the patient from the ventilator and provide manual bag-mask ventilation✓ 정답
4Suction the endotracheal tube to clear potential secretions
해설
Disconnecting from the ventilator for manual bag-mask ventilation ensures immediate ventilation and oxygenation while assessing the cause. Other actions may delay critical intervention.
The patient presents with a classic triad of sudden respiratory distress, decreased oxygen saturation, and asymmetrical chest rise (decreased on the right) while on positive-pressure mechanical ventilation. The ventilator alarm is sounding, and the patient is agitated with asynchronous breathing patterns. This acute deterioration strongly suggests a tension pneumothorax, a life-threatening complication of mechanical ventilation.
Pathophysiology of Ventilator-Induced Pneumothorax
In patients with COPD, the lung parenchyma is already compromised by emphysematous changes and bullae formation. When positive-pressure ventilation is applied, the mechanical load is disproportionately borne by a smaller, non-recruitable "baby lung" — a concept describing the reduced functional lung volume available for ventilation [1]. This creates high regional transpulmonary pressures that can rupture subpleural blebs or bullae, allowing air to escape into the pleural space. As air accumulates under positive pressure without an escape route, intrapleural pressure rises progressively, eventually compressing the mediastinum and shifting it to the contralateral side. This impairs venous return, reduces cardiac output, and causes cardiovascular collapse if not immediately decompressed.
Why Other Options Are Incorrect or Delayed
- Option 1 (Increase FiO2): While increasing FiO2 addresses hypoxemia, it does nothing to relieve the accumulating intrapleural pressure that is mechanically compressing the lung and great vessels. In tension pneumothorax, oxygenation will not improve until the pressure is released.
- Option 2 (Administer sedation): Sedation may reduce patient-ventilator dyssynchrony, but it masks the underlying problem and delays definitive treatment. The agitation here is a symptom of air hunger and hemodynamic compromise, not primary anxiety.
- Option 4 (Suction the endotracheal tube): Secretions can cause increased airway resistance and alarms, but they would typically produce bilateral breath sound changes and symmetrical chest movement abnormalities. The unilateral decreased chest rise points away from a tube obstruction and toward a pleural space problem.
Rationale for Priority Action: Disconnect and Bag
The nurse's priority action is to disconnect the patient from the ventilator and initiate manual bag-mask ventilation. This accomplishes two critical goals simultaneously. First, it immediately removes the source of ongoing positive pressure that is driving air into the pleural space and worsening the tension physiology. Second, it allows the nurse to assess lung compliance manually — a stiff, difficult-to-ventilate chest on the affected side confirms the suspicion of pneumothorax. This intervention is the fastest way to prevent progression to cardiac arrest while preparing for definitive needle decompression or chest tube insertion.
Clinical Recognition and POCUS Correlation
Early recognition of pneumothorax under positive-pressure ventilation is challenging because the presentation can mimic other causes of acute deterioration [1]. The combination of ventilator alarms (high peak airway pressure), unilateral decreased chest rise, and sudden desaturation should immediately raise suspicion. Point-of-care ultrasonography (POCUS) has become an invaluable bedside tool for rapid diagnosis in such scenarios, allowing visualization of the absence of lung sliding and the presence of a lung point sign . While the nurse's immediate action is clinical decompression, understanding that POCUS can confirm the diagnosis rapidly supports the urgency of the clinical assessment findings.
References (research sources)
[1]
Positive-Pressure Ventilation-induced Pneumothorax After Intubation: A Pandora's Box of Early Diagnostic Pitfalls and Ultrasound-First Management.Research articleDasgupta A, Das A, Paul S, Banerjee P, Choudhuri B, Basu S. (2025) · DOI: 10.7759/cureus.91943
Clinical Emergency Guide
Suspect tension pneumothorax in any ventilated patient with acute onset of hypoxia, asymmetric chest rise, and high-pressure alarms. Immediate disconnection from the ventilator and manual bag-mask ventilation is the priority to prevent cardiac arrest.
Step-by-Step Emergency Response
Disconnect the patient from the ventilator circuit immediately to stop active air trapping.
Initiate manual bag-mask ventilation with 100% oxygen to support gas exchange.
Perform a rapid physical assessment focusing on tracheal deviation and breath sounds.
Prepare for immediate needle decompression or assist with chest tube insertion.
Reconnect to the ventilator only after definitive pleural space decompression is achieved.
Key Assessment Findings
Tracheal deviation away from the affected side (late sign).
Hyperresonance to percussion on the affected side.
Absent or diminished breath sounds unilaterally.
Distended neck veins and hypotension indicating obstructive shock.
Nursing Documentation Points
Time of onset of symptoms and ventilator alarm parameters.
Sequence of interventions performed and patient response.
Vital signs before, during, and after manual ventilation.
Notification of provider and time of definitive decompression.
Tension Pneumothorax — A life-threatening condition where air enters the pleural space and cannot escape, causing lung collapse and mediastinal shift that impairs cardiac output.
Asynchronous Breathing — A mismatch between the patient's spontaneous respiratory efforts and the ventilator-delivered breaths, often a sign of distress or equipment failure.
Baby Lung Concept — The reduced functional lung volume in ARDS or COPD that receives the majority of tidal volume, making it susceptible to overdistension and barotrauma.
Bag-Mask Ventilation — Manual delivery of positive-pressure breaths using a self-inflating bag and mask, used as a bridge to stabilize a patient during ventilator emergencies.
Barotrauma — Tissue injury caused by pressure changes, commonly leading to pneumothorax in mechanically ventilated patients due to high transpulmonary pressures.