Thoracostomy tube: when to place a chest drain
In which of these situations is placing a thoracostomy tube most indicated?
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A. Cat with heart failure and pleural effusion that improves after one thoracocentesis
Cardiogenic effusion is controlled with thoracocentesis as needed and heart failure treatment; an indwelling drain adds risk of infection and protein loss without benefit.
B. Pneumothorax that keeps recurring and needs several thoracocenteses within a few hours, or in which negative pressure is never reached
Correct. If air reaccumulates quickly (for example, more than 2–3 thoracocenteses in 24 h) or no vacuum is achieved, the leak is significant and a drain allows it to be evacuated continuously or intermittently. Pyothorax is the other main indication.
C. Dog with traumatic pneumothorax that resolves after a single thoracocentesis
Most traumatic pneumothoraces seal on their own; if one thoracocentesis is enough, the patient is monitored without a drain.
D. Idiopathic chylothorax awaiting surgery, to drain the chyle continuously
In chylothorax intermittent thoracocentesis is usually preferred: prolonged continuous drainage favours loss of lymphocytes, protein and fat, and infection.
lightbulb Key takeaway
Indications for a chest drain: pneumothorax needing repeated thoracocentesis or without negative pressure, pyothorax (to drain and lavage) and after thoracotomy. Small-bore wire-guided drains (Seldinger technique) can be placed under sedation and local anaesthesia in many patients.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.