Pyothorax, or purulent pleural effusion, is a life-threatening emergency in cats requiring immediate intervention and intensive long-term management to resolve successfully.
Pyothorax causes acute severe respiratory distress as pus accumulation prevents the lungs from fully expanding. Cats with pyothorax gasp for breath and may open-mouth breathe - a sign of extreme respiratory compromise in a species that normally breathes silently through the nose. The treatment process, while effective, is intensive and uncomfortable for the cat - chest drains require sedation for placement and lavage causes additional discomfort. The prolonged hospitalisation is stressful. However, successful resolution returns cats to a normal quality of life, making the intensive treatment period a worthwhile welfare investment for the majority of cases.