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Case 69: Urgent underwater seal-drain

Whilst working at a small country hospital you are faced with a 32 year old man involved in a farming accident. He has been charged by a bull and one horn has penetrated his right chest. An xray shows haemo-pneumothorax. You have inserted an intercostal catheter but the hospital does not have a modern drain chamber to connect it to. The nurses find some old glass chambers and rubber tubing that they used when the hospital was better funded 20 years ago.

1. How would you connect the tubing to create a standard 3 chamber system with 20 cm water suction?

2. What is the significance of bubbles appearing in chamber A on the drain above?

3. What is the significance of "swinging" and where would you look for it?