Pneumothorax in CVICU: Diagnosis, Signs, Symptoms, and Treatment

Definition and Types

Pneumothorax is the presence of air in the pleural space, which can occur spontaneously or as a complication of procedures commonly performed in the CVICU, with iatrogenic pneumothorax being most common, resulting from central venous catheter insertion, positive pressure ventilation, or other invasive procedures 1
Tension pneumothorax occurs when intrapleural pressure exceeds atmospheric pressure throughout the respiratory cycle, creating a one-way valve effect that can rapidly lead to cardiovascular collapse 3

Acute, ipsilateral chest pain that may be sharp or stabbing in nature, is a common symptom of pneumothorax 2
Decreased or absent breath sounds on the affected side is a key finding in physical examination 1, 2
Hemodynamic instability, such as hypotension and tachycardia, is a warning sign of tension pneumothorax 2, 3

Chest X-ray is the initial diagnostic test, showing air in the pleural space and possible mediastinal shift in tension pneumothorax 1
Clinical diagnosis may necessitate immediate intervention before imaging confirmation in critically ill patients with sudden deterioration 4

For tension pneumothorax with hemodynamic compromise, immediate needle decompression using a large-bore cannula is recommended, followed promptly by tube thoracostomy 3, 4
Tube thoracostomy is recommended for symptomatic patients or those on mechanical ventilation 1, 4
Current guidelines recommend small-bore chest tubes as first-line management for most pneumothoraces 4

Use of ultrasound guidance for central venous catheter insertion can reduce the risk of pneumothorax 1
Avoiding the subclavian approach during early training can reduce the risk of pneumothorax 1
Ensuring proper positioning of central venous catheters with post-procedure chest X-ray can help prevent pneumothorax 1

Patients with underlying lung disease are at higher risk for pneumothorax development and complications 4
Even small, asymptomatic pneumothoraces can rapidly progress to tension pneumothorax when positive pressure ventilation is initiated, highlighting the need for prompt recognition and management 4