Size of air leak
Pnuemothorax (ptx) occurs when air escapes from the lung causing the lung to collapse.
This may occur after an injury to the lung or if a outpouching of the lung (a bleb) ruptures. If too much air leaks out, the pressure in the chest can build up to the point that pressure is put on the heart
and large blood vessels in the chest and cause tension ptx. This can be fatal if not treated promptly.