Which option is a less invasive method for pneumothorax drainage?

• A. Oxygen
• B. Small-bore catheter
• C. Needle decompression
• D. Water seal chest tube

Answer: (B)

The idea here is choosing a drainage method that minimizes invasiveness while still effectively removing air from the pleural space. Using a small-bore chest catheter allows air to be evacuated through a very small tube placed with a minimally invasive technique, so it typically causes less tissue trauma and can be done at the bedside compared with a traditional large-bore chest tube. Oxygen therapy helps the body absorb air from the pleural space more quickly but does not drain the pneumothorax itself, so it isn’t a drainage method. Needle decompression is an emergency maneuver for a tension pneumothorax to relieve pressure quickly, but it’s a temporary, invasive intervention and not a definitive drainage solution for a stable pneumothorax. A water-seal chest tube is a standard drainage approach but involves a larger bore and more invasiveness than a small-bore catheter. Therefore, the least invasive option for draining a pneumothorax is the small-bore catheter.